Innovative baseisolated building with large massratio TMD at basement for greater earthquake resilience


 Amie Atkinson
 1 years ago
 Views:
Transcription
1 Hashimoto et al. Future Cities and Environment (215) 1:9 DO /s TECHNCAL ARTCLE nnovative baseisolated building with large massratio TMD at basement for greater earthquake resilience Takuya Hashimoto, Kohei Fujita, Masaaki Tsuji and zuru Takewaki * Open Access Abstract Tuned mass dampers (TMD) have been used for the reduction of building responses to wind loading in many highrise buildings. An innovative and resilient baseisolated building with a large massratio TMD is introduced here primarily for earthquake loading in which the large massratio TMD is located at basement. This new hybrid system of baseisolation and structural control possesses advantageous features compared to existing comparable systems with a TMD at the baseisolation story. The TMD stroke can be reduced to a small level with the use of an inertial mass damper and its reaction can be limited to a lower level by detaching its connection to ground. The proposed hybrid system has another advantage that the does not bring large gravitational effect on the building itself. t is demonstrated that the proposed hybrid system is robust both for pulsetype ground motions and longperiod, longduration ground motions which are regarded as representative influential ground motions. Keywords: Earthquake resilience; Baseisolation; Tuned mass damper; Large massratio TMD; nertial mass damper; Basement; Hybrid system ntroduction There is an increasing need and interest of construction of highrise buildings in urban areas. This trend will be accelerated in the future. Highrise buildings and super highrise buildings are required to resist for various external loadings, e.g. wind and earthquake loadings. Enhancement of resilience of such highrise and super highrise buildings after intensive wind and earthquake loadings is a major concern from the viewpoint of the business continuity plan (BCP) which is the most controversial issue in the sound development of society (Takewaki et al. 211, 212b). Tuned mass dampers (TMD) are useful for the reduction of building responses to wind loading and are installed in many highrise buildings all over the world (Soong and Dargush 1997). However it is well known that TMD is not effective for earthquake responses because of its limitation on stroke and realization of large massratio TMD. Nevertheless, some attempts have been made on the introduction of large massratio TMD mainly for earthquake loading (Chowdhury et al. 1987; Feng and Mita * Correspondence: Department of Architecture and Architectural Engineering, Kyoto University, KyotodaigakuKatsura, Nishikyoku, Kyoto , Japan 1995; Villaverde 2; Arfiadi 2; Zhang and wan 22; Villaverde et al. 25; Mukai et al. 25; Tiang et al. 28; Matta and De Stefano 29; Petti et al. 21; Angelis et al. 212; Nishii et al. 213; Xiang and Nishitani 214). Actually several projects are being planned in Japan, e.g. installation of largemass pendulumsystematroofandusageofupperstoriesastmd masses. Recently large massratio TMDs are investigated for baseisolated buildings (Villaverde 2; Villaverde et al. 25; Angelis et al. 212; Nishii et al. 213; Xiang and Nishitani 214). While usual highrise buildings exhibit large displacement around the top story, baseisolated buildings show relatively large displacement around the baseisolation story near ground surface. This property is very advantageous from the view point of mitigation of effect of excessive vertical load due to large massratio TMD (Karee997; Zhang and wan 22; Mukai et al. 25; Petti et al. 21; Nishii et al. 213; Xiang and Nishitani 214). However there still exist several issues to be resolved, e.g. avoidance of excessive vertical load by large massratio TMD, reduction of TMD stroke, reduction of TMD support reactions. 215 Hashimoto et al. Open Access This article is distributed under the terms of the Creative Commons Attribution 4. nternational License (http://creativecommons.org/licenses/by/4./), which permits unrestricted use, distribution, and reproduction in any medium, provided yoive appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
2 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 2 of 19 Small massratio TMD on roof Large massratio TMD on roof (Excessive vertical load) Large massratio TMD on roof of baseisolated building (Excessive vertical load) Base isolation for wind for earthquake for earthquake (a) (b) (c) Fig. 1 Conventional model and unrealistic model with excessive vertical load Large massratio TMD at basement (Smart treatment of excessive vertical load) nertial mass damper Base isolation Base isolation solator spring Slide on rail (a) Proposed1 Model (Friction on rail) Use of basement machine as (c) Proposed2 Model (b) Secondary Proposed1 Model (Friction free) Base isolation Slide on rail Fig. 2 Proposed1 model and Proposed2 model (d) Mechanism example of inertial mass damper
3 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 3 of 19 m k1, c1 u 1 1 m 2 2 m2 u2 u z m k 2 u m2 u2 c 2 (a) B Model (b) mass TMD Model (c) New TMD Model m k1, c1 u m k1, c1 u k c 2, 2 m 2 u 2 k, c m 2 k c z 2, 2, 2 u 2 (d) Proposed1 Model (e) Proposed2 Model Fig. 3 Baseisolated building models treated in this paper (a B Model: Simple baseisolated building, b mass TMD Model: Model proposed by Nishii et al. (Nishii et al. 213), c NewTMD Model: Model proposed by Xiang and Nishitani (Xiang and Nishitani 214), d Proposed1 Model: Baseisolated building with largemass ratio TMD at basement, e Proposed2 Model: Baseisolated building with largemass ratio TMD at basement using inertial mass damper for stroke reduction) The purpose of this paper is to propose an innovative system of baseisolated buildings with a large massratio TMD at basement. The most serious issue of effect of excessive vertical load due to large massratio TMD on the main building is avoided by introducing the large massratio TMD at basement which is made possible due to the large displacement of a floor in the baseisolation story near basement. Another issue of large stroke of TMD even in the large massratio TMD is overcome by introducing inertial mass dampers in parallel to the springdashpot system in the TMD system. Fig. 4 Determination of stiffness of TMD (tuning of TMD)
4 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 4 of 19 Baseisolated building with largemass ratio TMD at basement Figure 1(a) shows a conventional system with small massratio TMD on the roof which is effective only for wind loading. On the other hand, Fig. 1(b) presents a highrise building with large massratio TMD on the roof which is believed to be effective for longperiod ground motion and to cause significant vertical load on the building. Consider next a baseisolated building system, as shown in Fig. 1(c), with large massratio TMD on the roof which lengthens the fundamental natural period of the highrise building and also causes large vertical load on the building. The models in Fig. 1(b) and (c) are thought to be unrealistic because of their excessive vertical load. Figure 2(a) indicates the proposed baseisolated building system with large massratio TMD at basement using sliders and rails. This model shown in Fig. 2(a) is called the Proposed1 model. n Fig. 2(a) the large massratio TMD is located on the sliders and rails and in Fig. 2(b) the large massratio TMD is set on the floor just above the baseisolation system. Baseisolated building without TMD Consider a baseisolated building without TMD. This model is called a B model (see Ariga et al. 26). Let k, c, m denote the stiffness, damping coefficient and mass of the baseisolation story in the B model. Furthermore let k 1, c 1, denote the stiffness, damping coefficient and mass of the superstructure. The displacements of masses and m relative ground are denoted by and u, respectively. This model is subjected to the base ground acceleration ü g. The equations of motion for this model can be expressed by m u þ c þ c 1 c 1 _u c 1 c 1 _ þ k þ k 1 k 1 u k 1 k 1 ¼ m ð1þ Conventional baseisolated building with largemass ratio TMD Recently some systems of a baseisolated building with largemass ratio TMD have been proposed. Mukai et al. (25) proposed a newtype active response control system to improve the effectiveness of baseisolated buildings. n this system, the is connected both to a superstructure and the basement (ground). A negative stiffness mechanism is used to amplify the response of the which enables the avoidance of introduction of large massratio TMD. Nishii et al. (213) revised the system due to Mukai et al. (25) by replacing the active damper with negative stiffness with Verocity (m/s) Fig. 5 Simulated longperiod ground motion (T = 7. s) a passive inertial mass damper system. This model is called the mass TMD model in this paper. Although their system is demonstrated to be effective for the reduction of superstructure response, the performance check on the reaction of the TMD system is not conducted. Xiang and Nishitani (214) presented a system for a baseisolated building with a which is located on the baseisolation story level and connected directly to the ground. This model is called the NewTMD model in this paper. They demonstrated that their system is effective for a broad range of excitation frequency and proposed an optimization method for determining the system parameters. Consider an mass TMD model and a NewTMD model as shown in Fig. 3. Let k 2, c 2, m 2 denote the stiffness, damping coefficient and mass of the TMD system. z 2 indicates the inertial mass capacity of the inertial mass damper installed between and ground in the mass TMD model. For later comparison, the mass TMD model and the NewTMD model are explained in the following. The equations of motion for mass TMD model may be expressed by 1 A 1 c þ c 1 þ c 2 c 1 c A c 1 c 1 A _ A m 2 þ z 2 u 2 c 2 c 2 _u 2 1 k þ k 1 þ k 2 k 1 k 2 k 1 k 1 A 1 A A k 2 k 2 u 2 m 2 ð2þ On the other hand, the equations of motion for NewTMD model may be presented by Verocity (m/s) Fig. 6 Simulated pulsetype ground motion (T = 2. s)
5 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 5 of m u c þ c 1 c 1 _u B CB C B CB A c 1 c 1 _ A m 2 u 2 c 2 _u k þ k 1 þ k 2 k 1 k 2 u m B CB C B k 1 k 1 A ¼ u g A ð3þ k 2 k 2 u 2 m 2 Baseisolated building with largemass ratio TMD at basement using inertial mass damper for stroke reduction The equations of motion for a baseisolated building with largemass ratio TMD at basement may be expressed by 1 A 1 c þ c 1 þ c 2 c 1 c A c 1 c 1 A _ A m 2 u 2 c 2 c 2 _u 2 1 k þ k 1 þ k 2 k 1 k 2 k 1 k 1 A 1 A A k 2 k 2 u 2 m 2 ð4þ A baseisolated building, as shown in Fig. 2(c), with largemass ratio TMD at basement using an inertial mass damper for stroke reduction is called the Proposed2 model. A mechanism example of inertial mass dampers is shown in Fig. 2(d) (Takewaki et al. 212a). The equations of motion for this model may be expressed by 1 m þ z 2 z A 1 c þ c 1 þ c 2 c 1 c A c 1 c 1 A _ A z 2 m 2 þ z 2 u 2 c 2 c 2 _u 2 1 k þ k 1 þ k 2 k 1 k 2 k 1 k 1 A 1 A A k 2 k 2 u 2 m 2 ð5þ The model parameters of B Model, Proposed1 Model and Proposed2 Model as shown in Fig. 3 are specified as follows. The same model parameters are used for mass TMD Model and NewTMD Model. The influence of the rail friction on the response of the proposed baseisolation story (m) 2story baseisolation story (m) (a) baseisolation story story 2story.8 5story (b) TMD stroke Reaction of sprong 5 2story Reaction of sprong 1 5story (c) supporting TMD 3 2story story (d) supporting TMD Reaction of inertial mass damper 25 2story Reaction of inertial mass damper 5 5story (e) Reaction of inertial mass damper supporting TMD Fig. 7 Response to simulated longperiod ground motion B Model Proposed1 Model Proposed2 Model mass TMD Model NewTMD Model
6 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 6 of 19 models will be discussed in Section nfluence of rail friction on response of proposed system. The superstructure is a 2story or 5story reinforced concrete building and is modeled into a singledegreeoffreedom (SDOF) model. This modeling into an SDOF model is thought to be appropriate in a baseisolated building. The equal story height of the original building is 3.5 m. The building has a plan of 4 4 m and the floor mass is obtained from 1 3 kg/m 2. The floor mass in each floor is kg. The fundamental natural period of the superstructure with fixed base is T 1 =1.4sfora2 story building and T 1 =3.5 s for a 5story building. The structural damping ratio is assumed to be h 1 = 2. The stiffness and damping coefficient of the SDOF model are computed by k 1 ¼ ω 2 1, c 1 =2h 1 k 1 /ω 1 with the fundamental natural circular frequency ω 1 =2π/T 1. The mass of the baseisolation story is kg. The fundamental natural period of the B model with rigid superstructure is T =5.sforthe2storymodelandT =6. s for the 5story model. The damping ratio of the B model with rigid superstructure is h =.1. The stiffness and damping coefficient of the SDOF model are computed by k ¼ ðm þ Þω 2, c =2h k /ω with the fundamental natural circular frequency ω =2π/T. As for TMD, the mass ratio m 2 / is set to μ =.1 and the inertial mass damper ratio z 2 / is set to η s = 6. The damping ratio is assumed to be h 2 =.3. The stiffness and damping coefficient of TMD are given by k 2 ¼ ðm 2 þ z 2 Þ ω 2 2, c 2 =2h 2 k 2 /ω 2 in terms of the natural circular frequency ω 2 of TMD. The process of determining ω 2 is explained in Section Determination of stiffness and damping coefficient of TMD. Determination of stiffness and damping coefficient of TMD n this section, the procedure of determination of stiffness and damping coefficient of TMD for the proposed model, mass TMD model and NewTMD model is explained. The tuning of TMD is performed by minimizing the response ratio D of the deformation of the base baseisolation story (m) story baseisolation story (m).7 5story story (a) baseisolation story 2story (b) TMD stroke Reaction of sprong 5 2story Reaction of sprong 5 5story (c) supporting TMD 4 2story story (d) supporting TMD Reaction of inertial mass damper story Reaction of inertial mass damper 25 5story (e) Reaction of inertial mass damper supporting TMD Fig. 8 Response to simulated pulsetype ground motion B Model Proposed1 Model Proposed2 Model mass TMD Model NewTMD Model
7 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 7 of 19 isolation story to the base input (displacement amplitude) as shown in Fig. 4. Let us assume the input ground acceleration as ¼ Ae iωt ð6þ The harmonic response of the systems may be expressed by ðu U 1 U 2 Þ T ¼ ω 2 1 M þ iωc þ K ð m A A m 2 A Þ T ð8þ where () T indicates the matrix transpose. The displacement response ratio D can then be defined by ðu u 2 Þ ¼ ðu U 1 U 2 Þe iωt ð7þ D ¼ U A=ω 2 1 ð9þ By solving the equations of motion, the response amplitude may be obtained as where ω 1 is the undamped natural circular frequency of the B model. baseisolation story (m) (a) baseisolation story (b) acceleration acceleration (m/s 2 ) 5 superstructure (m) (c) superstructure (d) TMD stroke relative to ground (m) (e) relative to ground (f) supporting TMD Proposed1 Model (friction free) 2 Proposed1 Model (friction on rail) (g) supporting TMD Fig. 9 nfluence of friction on rail in Proposed1 Model subjected to simulated longperiod ground motion (2story, input period T = 5. s)
8 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 8 of 19 Response reduction performance of proposed system for simple baseisolated building and conventional baseisolationtmd hybrid system Simulated longperiod ground motion and simulated pulsetype ground motion Let us assume the simulated longperiod ground motion in terms of circular frequency ω =2π/T (T: period) as ¼ A sinωt ð1þ Figure 5 shows a simulated longperiod ground motion with T =7.(s). On the other hand, let us assume the simulated pulsetype ground motion as _u p ¼ Ct n e at sinω p t h u p ¼ Ct n e at n i t a sinω p t þ ω p cosω p t ð11þ ð12þ where C: an amplitude coefficient, a: reduction coefficient, n: envelope shape coefficient, ω p =2π/T:circular frequency (see Xu et al. 27). C is determined so as to control the maximum velocity and a is determined from a =.4ω p. The maximum ground velocity is set to.91(m/s) (the maximum velocity of JMA Kobe NS 1995). The period of the pulse wave is specified in the range of ~ 3.(s) with.1(s) as the increment. Figure 6 shows the pulsetype wave of T = 2.(s). baseisolation story (m) acceleration (m/s 2 ) (a) baseisolation story (b) acceleration superstructure (m) (c) superstructure (d) TMD stroke relative to ground (m) (e) relative to ground (g) supporting TMD (f) supporting TMD Proposed1 Model (friction free) Proposed1 Model (friction on rail) Fig. 1 nfluence of friction on rail in Proposed1 Model subjected to simulated longperiod ground motion (5story, input period T = 7. s)
9 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 9 of 19 Response reduction performance of proposed system for simple baseisolated building Figure 7 shows the comparison of various performances under simulated longperiod ground motion among B model, Proposed1 model, Proposed2 model, mass TMD model and NewTMD model. The performances to be compared are (a) baseisolation story, (b) TMD stroke, (c) Reaction of spring supporting TMD, (d) supporting TMD, (e) Reaction of inertial mass damper supporting TMD. The left figures are for 2 story models and the right figures are for 5story models. t can be observed that Proposed1 model can reduce the deformation of baseisolation story by about 38 % compared to B model and Proposed2 model can decrease TMD stroke by about 27 % compared to Proposed1 model. On the other hand, Fig. 8 illustrates the comparison of those performances under simulated pulsetype ground motion. As in Fig. 7, the left figures are for 2story models and the right figures are for 5story models. t can be observed that the deformation of baseisolation story of Proposed1 model and Proposed2 model does not change so much from B model and the baseisolation performance can be kept. Furthermore Proposed2 model can reduce the TMD stroke by about 38 % compared to Proposed1 model. Response reduction performance of proposed system for conventional baseisolationtmd hybrid system t is meaningful to note that, while TMD is connected to the baseisolation floor in the proposed models (Proposed1 model and Proposed2 model), TMD is connected both to the baseisolation floor and ground in the conventional baseisolationtmd hybrid system (mass TMD model and NewTMD model). For this reason the baseisolation story (m) superstructure (m) relative to ground (m) acceleration (m/s 2 ) (a) baseisolation story (b) acceleration (c) superstructure (d) TMD stroke.5 Proposed2 Model (friction free) Proposed2 Model (friction on rail) (e) relative to ground (f) supporting TMD (g) supporting TMD (h) Reaction of inertial mass damper supporting TMD Fig. 11 nfluence of friction on rail in Proposed2 Model subjected to simulated longperiod ground motion (5story, input period T = 7. s) Reaction of inertial mass damper 5
10 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 1 of 19 TMD reactions become relatively large in mass TMD model and NewTMD model. Although the proposed system (Proposed2 model) increases the building response under a longperiod ground motion slightly compared to the system without an inertial mass damper (Proposed1 model), the response is still smaller than that of a baseisolated building without TMD. n addition, the proposed system (Proposed2 model) can reduce the TMD stroke under a longperiod ground motion owing to the inertial mass damper. Furthermore, the proposed system (Proposed2 model) can also reduce the TMD stroke under a pulsetype ground motion owing to the inertial mass damper. t can be concluded that the proposed systems (Proposed 1 model and Proposed2 model) can reduce the TMD stroke and TMD reaction effectively compared to the conventional NewTMD model and mass TMD model for both longperiod ground motions and pulsetype ground motions. nfluence of rail friction on response of proposed system Since the friction on rail in the TMD system could affect the performance of the proposed control system, its influence has been investigated. Although the static friction behavior is usually different from the dynamic one, the static friction coefficient has been treated as the same as the dynamic one. n this paper, the friction coefficient 8 has been used. n order to simulate the friction on rail, an elasticperfectly plastic relation has been utilized and the initial stiffness has been specified as 1 1 (N/m). Figure 9 shows the influence of friction on rail in Proposed1 Model subjected to simulated longperiod baseisolation story (m).5 acceleration (m/s 2 ) (a) baseisolation story (b) acceleration superstructure (m) (c) superstructure (d) TMD stroke relative to ground (m) (e) relative to ground (f) supporting TMD Proposed1 Model (friction free) Proposed1 Model (friction on rail) (g) supporting TMD Fig. 12 nfluence of friction on rail in Proposed1 Model subjected to simulated pulsetype motion (2story, input period T = 2. s)
11 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 11 of 19 ground motion (2story, input period T = 5. s). Figure 1 illustrates the influence of friction on rail in Proposed1 Model subjected to simulated longperiod ground motion (5story, input period T =7. s). Furthermore Fig. 11 presents the influence of friction on rail in Proposed2 Model subjected to simulated longperiod ground motion (5story, input period T =7.s). On the other hand, Fig. 12 shows the influence of friction on rail in Proposed1 Model subjected to simulated pulsetype motion (2story, input period T = 2. s). Figure 13 illustrates the influence of friction on rail in Proposed1 Model subjected to simulated pulsetype motion (5story, input period T = 2. s). Furthermore Fig. 14 presents the influenceoffrictiononrailinproposed2modelsubjected to simulated pulsetype motion (5story, input period T = 2. s). t can be observed that, while the reactions of TMD supports and TMD stroke are affected slightly inadampedprocess,thesuperstructureresponseand baseisolation story response are not affected so much. t can be concluded that, although the frictions of TMD mass on rail in the proposed systems reduce the TMD stroke for both longperiod ground motions and pulsetype ground motions, those do not affect so much on the building response. Reduction of TMD stroke using various methods n the large massratio TMD, the reduction of stroke of TMD is a key issue. Figure 15 shows several attempts to implement it. Proposed1 model is a basic model. As its derivatives, Proposed11 model (detuning), Proposed12 model (increased damping) and Proposed13 model (increased ratio) are considered. Furthermore Proposed2 model is a derivative of Proposed1 baseisolation story (m) superstructure (m) (a) baseisolation story (b) acceleration acceleration (m/s 2 ) (c) superstructure (d) TMD stroke relative to ground (m) (e) relative to ground (f) supporting TMD (g) supporting TMD Proposed1 Model (friction free) Proposed1 Model (friction on rail) Fig. 13 nfluence of friction on rail in Proposed1 Model subjected to simulated pulsetype motion (5story, input period T = 2. s)
12 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 12 of 19 baseisolation story (m) superstructure (m) relative to ground (m) (a) baseisolation story (b) acceleration acceleration (m/s 2 ) (c) superstructure (d) TMD stroke (e) relative to ground (f) supporting TMD (g) supporting TMD (h) Reaction of inertial mass damper supporting TMD Fig. 14 nfluence of friction on rail in Proposed2 Model subjected to simulated pulsetype motion (5story, input period T = 2. s) Proposed2 Model (friction free) Proposed2 Model (friction on rail) Reaction of inertial mass damper model and includes an inertial mass damper in TMD. The mass TMD model is also a derivative of Proposed1 model and has an inertial mass damper between TMD mass and ground. Table 1 shows design conditions on TMD parameters in abovementioned several models for stroke reduction. The TMD parameters have been determined so as the reduction of TMD stroke from Proposed1 model under a longperiod ground motion to be almost equivalent. Figure 16 shows the responses ((a) deformation of baseisolation story, (b) acceleration, (c) deformation, (d) TMD stroke, (e) TMD displacement relative to ground (f) supporting TMD, (g) supporting TMD, (h) Reaction of inertial mass damper supporting TMD) to a longperiod ground motion and Fig. 17 shows those responses to a pulsetype ground motion. The comprehensive comparison of the response characteristics in Fig. 16 will be shown in Fig. 2 and Table 2. A similar comparison of the response characteristics in Fig. 17 will be shown in Fig. 21 and Table 2. Figure 18 shows the comparison with B model under a pulsetype motion and Fig. 19 indicates the comparison with Proposed1 model under a pulsetype motion. The comprehensive comparison of the response properties in Figs. 18 and 19 will be shown in Fig. 21 and Table 2. Figure 2 illustrates the response comparison under a longperiod ground motion. The maximum responses with respect to the input period have been taken. t can be observed that, while mass TMD model is superior to Proposed2 model in superstructure responses to some extent, Proposed2 model is superior to mass TMD model in TMD reactions. On the other hand, Fig. 21 shows the response comparison under a pulsetype ground motion
13 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 13 of 19 m k1, c1 u m u 2 (a) Basic model (Proposed1 Model) m k1, c1 u m k1, c1 u m k1, c1 u m 2 m 2 k, c 2 2 u 2, k2 c2 u 2 m u 2 (b) Proposed11 Model (detuning) (c) Proposed12 Model (increased damping) (d) Proposed13 Model (increased ratio) m m 2 k1, c1 u (e) Proposed2 Model (with inertial mass damper), z u Fig. 15 Several proposed models and conventional model for TMD stroke reduction m 2 2 m2 u2 u z 2 (f) mass TMD Model (conventional model with inertial mass damper) Table 1 Design conditions on TMD parameters in several models for TMD stroke reduction Proposed1 Model as basic model Proposed11 Model (detuning) Proposed12 Model (increased damping) Proposed13 Model (increased TMD massratio) Proposed2 Model (with inertial mass damper) ratio μ 1 % 1 % 1 % 26.7 % 1 % 1 % nertial mass damper ratio η s TMD damping ratio h 2 Tuning ratio γ mass TMD Model (conventional model with inertial mass damper)
14 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 14 of 19 Proposed1 Model Proposed11 Model Proposed12 Model Proposed13 Model Proposed2 Model mass TMD Model baseisolation story (m) (a) baseisolation story relative to ground (m) 2..5 acceleration (m/s 2 ) (b) acceleration (f) supporting TMD superstructure (m) (g) supporting TMD (d) TMD stroke (e) relative to ground Fig. 16 Response to longperiod ground motion (c) superstructure Reaction of inertial mass damper (h) Reaction of inertial mass damper supporting TMD Table 2 Response comparison among proposed models and conventional models under longperiod and pulsetype ground motions Proposed11 Model Proposed12 Model Proposed13 Model Proposed2 Model mass TMD Model Longperiod ground motion baseisolation story 〇 acceleration superstructure TMD stroke Similar reduction from Proposed1 Model relative to ground 〇 〇 supporting TMD supporting TMD Reaction of inertial mass damper supporting TMD Pulsetype ground motion baseisolation story acceleration superstructure TMD stroke 〇 〇 relative to ground 〇 〇 supporting TMD supporting TMD Reaction of inertial mass damper supporting TMD : excellent performance, 〇 : good performance, : fair performance, : ordinary performance : small change from Proposed1 model NewTMD Model
15 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 15 of 19 Proposed1 Model Proposed11 Model Proposed12 Model Proposed13 Model Proposed2 Model mass TMD Model (a) baseisolation story baseisolation story (m) (b) acceleration (c) superstructure acceleration (m/s 2 ) superstructure (m) (d) TMD stroke relative to ground (m) (e) relative to ground Fig. 17 Response to pulsetype ground motion (f) supporting TMD (g) supporting TMD Reaction of inertial mass damper (h) Reaction of inertial mass damper supporting TMD (comparison to B Model and Proposed1 Model, comparison of inertial mass damper reaction in mass TMD Model to Proposed2 Model). For pulsetype ground motions without peak with respect to input period, Fig. 21 has been derived from Figs. 18 and 19. t can be observed that, while Proposed2 model and mass TMD model are almost equivalent in superstructure responses, Proposed 2 model is highly superior to mass TMD model in TMD stroke and TMD reactions. Table 2 presents the response comparison of the proposed models and conventional models with Proposed1 model under longperiod ground motion and pulsetype ground motion. Proposed11 model exhibits a good TMD stroke reduction performance under pulsetype ground motion against Proposed1 model while the structural response under longperiod ground motion increases. Proposed12 model has a good reduction performance of TMD spring reaction under longperiod ground motion and pulsetype ground motion against Proposed1 model. Proposed13 model shows a good reduction performance of structural response under longperiod ground motion against Proposed1 model while the TMDsupporting member reactions under longperiod ground motion and pulsetype ground motion cause some problems. Proposed2 model exhibits a good reduction performance of TMD stroke under pulsetype ground motion against Proposed1 model and a good reduction performance of TMDsupporting inertial mass damper reaction under longperiod ground motion and pulsetype ground motion against mass TMD model. mass model shows a good reduction performance of structural response under longperiod ground motion against Proposed1 Model Proposed11 Model Proposed12 Model Proposed13 Model Proposed2 Model mass TMD Model baseisolation story (response ratio to B Model) acceleration (response ratio to B Model) (a) baseisolation story (b) acceleration Fig. 18 Comparison with B Model under pulsetype ground motion superstructure (response ration to B Model) (c) superstructure
16 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 16 of 19 Proposed1 Model Proposed11 Model Proposed12 Model Proposed13 Model Proposed2 Model mass TMD Model baseisolation story (response ratio to Proposed1 Model) (a) baseisolation story relative to ground (response ratio to Proposed1 Model) (e) relative to ground acceleration (response ratio to Proposed1 Model) supporting TMD (response ratio to Proposed1 Model) superstructure (response ration to Proposed1 Model) (b) acceleration (c) superstructure (f) supporting TMD supporting TMD (response ratio to Proposed1 Model) (g) supporting TMD TMD stroke (response ratio to Proposed1 Model) Reaction of inertial mass damper supporting TMD (response ratio to Proposed2 Model) (d) TMD stroke (h) Reaction of inertial mass damper supporting TMD Fig. 19 Response comparison under pulsetype motion (comparison to Proposed1 Model, comparison of inertial mass damper reaction in mass TMD Model to Proposed2 Model) Proposed1 model while the TMDsupporting member reactions under longperiod ground motion and pulsetype ground motion cause some problems. NewTMD model exhibits a good reduction performance of relative displacement of to ground under longperiod ground motion against Proposed1 model while the TMDsupporting member reactions under longperiod ground motion and pulsetype ground motion cause some problems. t is important to investigate the sensitivity of the system response to the change of the frequency of longperiod ground motions. When the input frequency of longperiod ground motions changes from the resonant situation, the TMD stroke and the reaction in the TMD decrease. Furthermore it has been confirmed that the response reduction performance in the TMD stroke and the reaction in the TMD is high in the proposed system compared to the conventional systems. Conclusions The following conclusions have been derived. (1)n order to overcome the difficulties caused by the resonance of a baseisolated building under longperiod ground motions and the ineffectiveness of TMD under pulsetype ground motions, a baseisolated building with a large massratio TMD at basement has been introduced. This new baseisolated building system is also aimed at enhancing the earthquake resilience of highrise buildings. The proposed hybrid system of baseisolation and structural control is effective for both longperiod ground motions and pulsetype ground motions. This hybrid system possesses advantageous features compared to existing comparable systems with a TMD at the baseisolation story. The TMD stroke can be reduced to a small level with the use of an inertial mass damper and its reaction can be limited to a lower level by detaching its connection to ground. The proposed hybrid system has another advantage that the does not bring large gravitational effect on the building itself because of the placement of TMD at basement. (2)The proposed system (Proposed1 model) can reduce the building response under a longperiod ground motion by 38 % compared to the baseisolated building and keeps the baseisolation performance under a pulsetype ground motion. (3)Although the proposed system (Proposed2 model) increases the building response under a longperiod ground motion slightly compared to the system without an inertial mass damper, the response is still smaller than that of a baseisolated building without TMD (B model). n addition, the proposed system (Proposed2 model) can reduce the TMD stroke under a longperiod ground motion owing to the inertial mass damper. Furthermore, the proposed
17 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 17 of 19 baseisolation story (m) acceleration (m/s 2 ) superstructure (m) relative to ground (m) Reaction of inertial mass damper Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Similar reduction from Proposed1 Model Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Fig. 2 Response comparison under longperiod ground motion
18 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 18 of 19 response ratio to B Model response ratio to Proposed1 Model response ratio to Proposed2 Model baseisolation story (response ratio) acceleration (response ratio) superstructure (response ratio) TMD stroke (response ratio) relative to ground (response ratio) supporting TMD (response ratio) supporting TMD (response ratio) Reaction of inertial mass damper supporting TMD (response ratio) Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD 3.98 Proposed1 Proposed11 Proposed12 Proposed13 Proposed2 mass TMD Fig. 21 Response comparison under pulsetype ground motion (comparison to B Model and Proposed1 Model, comparison of inertial mass damper reaction in mass TMD Model to Proposed2 Model)
19 Hashimoto et al. Future Cities and Environment (215) 1:9 Page 19 of 19 system (Proposed2 model) can reduce the TMD stroke under a pulsetype ground motion owing to the inertial mass damper. (4)The proposed system (Proposed1 model and Proposed2 model) can reduce the TMD stroke and TMD reaction effectively compared to the conventional NewTMD model and mass TMD model for both longperiod ground motions and pulsetype ground motions. (5)Although the frictions of on rails in the proposed systems reduce the TMD stroke for both longperiod ground motions and pulsetype ground motions, those do not affect so much on the building response. Takewaki, Murakami S, Yoshitomi S, Tsuji M (212a) Fundamental mechanism of earthquake response reduction in building structures with inertial dampers. Struct Control Health Monit 19(6):59 68 Takewaki, Moustafa A, Fujita K (212b) mproving the earthquake resilience of buildings: the worst case approach. Springer, London Tiang Z, Qian J, Zhang L (28) Slide roof systems for dynamic response reduction. Earthq Eng Struct Dyn 37: Villaverde R (2) mplementation study of aseismic roof isolation system in 13story building. Journal of Seismology and Earthquake Engineering 2:17 27 Villaverde R, Aguirre M, Hamilton C (25) Aseismic roof isolation system built with steel oval elements. Earthquake Spectra 21(1): Xiang P, Nishitani A (214) Optimum design for more effective tuned mass damper system and its application to baseisolated buildings. Struct Control Health Monit 21(1): Xu Z, Agrawal AK, He WL, Tan P (27) Performance of passive energy dissipation system during nearfield ground motion type pulse. Eng Struct 29: Zhang Y, wan WD (22) Protecting baseisolated structures from nearfield ground motion by tuned interaction damper. J Eng Mech ASCE 128(3): Competing interests The authors declare that they have no competing interests. Authors contributions TH carried out the theoretical and numerical analysis of the proposed TMD system. KF helped the numerical analysis. MT strengthened the theoretical analysis. T supervised the theoretical analysis and organized the research group. All authors read and approved the final manuscript. Acknowledgements Part of the present work is supported by the GrantinAid for Scientific Research of Japan Society for the Promotion of Science (No ). This support is greatly appreciated. Received: 22 July 215 Accepted: 22 July 215 References Angelis MD, Perno S, Reggio A (212) Dynamic response and optimal design of structures with large mass ratio TMD. Earthq Eng Struct Dyn 41(1):41 6 Arfiadi Y (2) Optimal passive and active control mechanisms for seismically excited buildings, Ph.D. Dissertation, University of Wollongong, Austria Ariga T, Kanno Y, Takewaki (26) Resonant behavior of baseisolated highrise buildings under longperiod ground motions. Struct Des Tall Spec Build 15(3): Chowdhury AH, wuchukwu MD, Garske JJ (1987) The past and future of seismic effectiveness of tuned mass dampers. n: Leipholz HHE (ed) Structural control, Martinus Nijhoff Publishers., pp Feng MQ, Mita A (1995) Vibration control of tall buildings using mega subconfiguration. J Eng Mech ASCE 121: Kareem A (1997) Modelling of baseisolated buildings with passive dampers under winds. J Wind Eng nd Aerodyn 72: Matta E, De Stefano A (29) Robust design of massuncertain rollingpendulum TMDs for seismic protection of buildings. Mech Syst Signal Process 23: Mukai Y, Fujimoto M, Miyake M (25) A study on structural response control by using poweredmass couplers system. J Structural Eng AJ 51B: Nishii Y, Mukai Y, Fujitani H (213) Response evaluation of baseisolated structure by tuned mass damper with amplifier mechanism. J Structural Eng AJ 59B: Petti L, Giannattasio G, De uliis M, Palazzo B (21) Small scale experimental testing to verify the effectiveness of the base isolation and tuned mass dampers combined control strategy. Smart Struct Syst 6(1):57 72 Soong TT, Dargush GF (1997) Passive energy dissipation systems in structural engineering. John Wiley & Sons, Chichester Takewaki, Fujita K, Yamamoto K, Takabatake H (211) Smart passive damper control for greater building earthquake resilience in sustainable cities. Sustainable Cities and Society 1(1):3 15 Submit your manuscript to a journal and benefit from: 7 Convenient online submission 7 Rigorous peer review 7 mmediate publication on acceptance 7 Open access: articles freely available online 7 High visibility within the field 7 Retaining the copyright to your article Submit your next manuscript at 7 springeropen.com
DEVELOPMENT AND APPLICATIONS OF TUNED/HYBRID MASS DAMPERS USING MULTISTAGE RUBBER BEARINGS FOR VIBRATION CONTROL OF STRUCTURES
13 th World Conference on Earthquake Engineering Vancouver, B.C., Canada August 16, 2004 Paper No. 2243 DEVELOPMENT AND APPLICATIONS OF TUNED/HYBRID MASS DAMPERS USING MULTISTAGE RUBBER BEARINGS FOR
More informationDT024 YEAR 4 GROUP ASSIGNMENT TUNING OF A VIBRATION ABSORBER FOR A SDOF SYSTEM. Table of Contents. 1 Introduction.. 2. 2 Damping in Structures...
! DT024 YEAR 4 GROUP ASSIGNMENT TUNING OF A VIBRATION ABSORBER FOR A SDOF SYSTEM Table of Contents Section Page 1 Introduction.. 2 2 Damping in Structures... 3 3 Background Theory 11 4 Theoretical Modelling
More informationGuideway Joint Surface Properties of Heavy Machine Tools Based on the Theory of Similarity
Research Journal of Applied Sciences, Engineering and Technology 5(): 530536, 03 ISSN: 0407459; eissn: 0407467 Maxwell Scientific Organization, 03 Submitted: October, 0 Accepted: December 03, 0 Published:
More informationControl of Seismic Drift Demand for Reinforced Concrete Buildings with Weak First Stories
Earthquake Yoshimura: Engineering Control and of Engineering Seismic Drift Seismology Demand for Reinforced Concrete Buildings with Weak First Stories 7 Volume 4, Number, September 3, pp. 7 3 Control of
More informationOPTIMAL ANALYSIS, DESIGN AND TESTING OF AN ELEC TROMAGNETIC DAMPER WITH RESONANT SHUNT CIRCUIT FOR VIBRATION CONTROL OF A CIVIL STRUCTURE
OPTIMAL ANALYSIS, DESIGN AND TESTING OF AN ELEC TROMAGNETIC DAMPER WITH RESONANT SHUNT CIRCUIT FOR VIBRATION CONTROL OF A CIVIL STRUCTURE Wai Kei Ao, Paul Reynolds University of Exeter, Vibration Engineering
More informationEarthquake tragedy and application of seismic isolation, energy dissipation and other seismic control systems to protect structures in China
Research & development Earthquake tragedy and application of seismic isolation, energy dissipation and other seismic control systems to protect structures in China 90% of the Chinese territory is seismic.
More informationSTUDY OF DAMRESERVOIR DYNAMIC INTERACTION USING VIBRATION TESTS ON A PHYSICAL MODEL
STUDY OF DAMRESERVOIR DYNAMIC INTERACTION USING VIBRATION TESTS ON A PHYSICAL MODEL Paulo Mendes, Instituto Superior de Engenharia de Lisboa, Portugal Sérgio Oliveira, Laboratório Nacional de Engenharia
More informationHydraulic Displacement Amplification System for Energy Dissipation
Hydraulic Displacement Amplification System for Energy Dissipation Tracy S.K. Chung and Eddie S.S. Lam ABSTRACT An energy dissipation system with displacement amplification is presented. Displacement amplification
More informationStructural Dynamics, Dynamic Force and Dynamic System
Structural Dynamics, Dynamic Force and Dynamic System Structural Dynamics Conventional structural analysis is based on the concept of statics, which can be derived from Newton s 1 st law of motion. This
More informationResponse to Harmonic Excitation Part 2: Damped Systems
Response to Harmonic Excitation Part 2: Damped Systems Part 1 covered the response of a single degree of freedom system to harmonic excitation without considering the effects of damping. However, almost
More informationSeismic Isolation Retrofitting of Japanese Wooden Buildings
Seismic Isolation Retrofitting of Japanese Wooden Buildings Summary Junko Suga Building Design Department Takenaka Corporation, Osaka Main Office Osaka, Japan Hiroyuki Ueda Building Design Department Takenaka
More informationINTERACTION BETWEEN MOVING VEHICLES AND RAILWAY TRACK AT HIGH SPEED
INTERACTION BETWEEN MOVING VEHICLES AND RAILWAY TRACK AT HIGH SPEED Prof.Dr.Ir. C. Esveld Professor of Railway Engineering TU Delft, The Netherlands Dr.Ir. A.W.M. Kok Associate Professor of Railway Engineering
More informationStructural Dynamics of Linear Elastic SingleDegreeofFreedom (SDOF) Systems
Structural Dynamics of Linear Elastic SingleDegreeofFreedom (SDOF) Systems SDOF Dynamics 31 This set of slides covers the fundamental concepts of structural dynamics of linear elastic singledegreeoffreedom
More informationThe Effect of Energy Dissipation Systems on the Four Story Steel Structure by Comparing Them
European Online Journal of Natural and Social Sciences 2015; Vol.3, No.3 Special Issue on New Trends in Architecture, Civil Engineering, and Urban Studies ISSN 18053602 www.europeanscience.com The Effect
More informationASCE 41 Seismic Rehabilitation of Existing Buildings
ASCE 41 Seismic Rehabilitation of Existing Buildings Presentation Topics: 1. How to define a Rehabilitation Objective per ASCE 41. 2. Data Collection and Testing. 3. Analysis Requirements. 4. Modeling.
More informationSIESMIC SLOSHING IN CYLINDRICAL TANKS WITH FLEXIBLE BAFFLES
SIESMIC SLOSHING IN CYLINDRICAL TANKS WITH FLEXIBLE BAFFLES Kayahan AKGUL 1, Yasin M. FAHJAN 2, Zuhal OZDEMIR 3 and Mhamed SOULI 4 ABSTRACT Sloshing has been one of the major concerns for engineers in
More informationModeling Mechanical Systems
chp3 1 Modeling Mechanical Systems Dr. Nhut Ho ME584 chp3 2 Agenda Idealized Modeling Elements Modeling Method and Examples Lagrange s Equation Case study: Feasibility Study of a Mobile Robot Design Matlab
More informationSEISMIC DESIGN OF MULTISTORY BUILDINGS WITH METALLIC STRUCTURAL FUSES. R. Vargas 1 and M. Bruneau 2 ABSTRACT
Proceedings of the 8 th U.S. National Conference on Earthquake Engineering April 1822, 26, San Francisco, California, USA Paper No. 28 SEISMIC DESIGN OF MULTISTORY BUILDINGS WITH METALLIC STRUCTURAL
More informationMethods for Seismic Retrofitting of Structures
Methods for Seismic Retrofitting of Structures Retrofitting of existing structures with insufficient seismic resistance accounts for a major portion of the total cost of hazard mitigation. Thus, it is
More informationUsing SpringMass Models to Determine the Dynamic Response of TwoStory Buildings Subjected to Lateral Loads
Using SpringMass Models to Determine the Dynamic Response of TwoStory Buildings Subjected to Lateral Loads S.T. De la Cruz, M.A. Rodríguez & V. Hernández Autonomous University of Ciudad Juárez, Ciudad
More informationThe kinematic interaction of a single pile with heterogeneous soil
Earthquake Ground Motion: Input Definition for Aseismic Design 135 The kinematic interaction of a single pile with heterogeneous soil M. Maugeri, E. Motta, E. Raciti & D. Ardita Department of Civil and
More informationSeismic Rehabilitation of Les Jardins Westmount, Montreal (Quebec), Canada
Seismic Rehabilitation of Les Jardins Westmount, Montreal (Quebec), Canada M. Zarrabi & R. Bartosh BCA Consultants, Montreal, Quebec, Canada A. Pall Pall Dynamics Limited, Montreal, Canada SUMMARY The
More informationSoil Dynamics Prof. Deepankar Choudhury Department of Civil Engineering Indian Institute of Technology, Bombay
Soil Dynamics Prof. Deepankar Choudhury Department of Civil Engineering Indian Institute of Technology, Bombay Module  2 Vibration Theory Lecture  8 Forced Vibrations, Dynamic Magnification Factor Let
More informationAnalysis of seismic response control for longspan cablestayed. bridge under traveling wave input *
Analysis of seismic response control for longspan cablestayed bridge under traveling wave input * QI ingjun, LI iaojun 2 ( Associate Professor, School of Civil Engineering, Shandong Jianzhu University,
More informationSeismic Isolated Hospital Design Practice in Turkey: Erzurum Medical Campus
Seismic Isolated Hospital Design Practice in Turkey: Erzurum Medical Campus J. Kubin, D. Kubin, A. Özmen, O.B. Şadan, E. Eroğlu Prota Engineering Design and Consultancy Services Inc. H. Sucuoğlu, S. Akkar
More informationIncorporating Gyromass Lumped Parameter Models (GLPMs) in OpenSees
TECHNICAL REPORT Incorporating Gyromass Lumped Parameter Models (GLPMs) in OpenSees Naba Raj Shrestha Graduate School of Science & Engineering Saitama University 7/30/2013 Introduction Lumped parameter
More informationDevelopment of Seismicinduced Fire Risk Assessment Method for a Building
Development of Seismicinduced Fire Risk Assessment Method for a Building AI SEKIZAWA National Research Institute of Fire and Disaster 3141, Nakahara, Mitaka, Tokyo 1818633, Japan sekizawa@fri.go.jp
More informationOPTIMAL DIAGRID ANGLE TO MINIMIZE DRIFT IN HIGHRISE STEEL BUILDINGS SUBJECTED TO WIND LOADS
International Journal of Civil Engineering and Technology (IJCIET) Volume 6, Issue 11, Nov 215, pp. 11, Article ID: IJCIET_6_11_1 Available online at http://www.iaeme.com/ijciet/issues.asp?jtype=ijciet&vtype=6&itype=11
More informationInfluence of Damping Systems On Building Structures Subject to Seismic Effects. Julius Marko
Influence of Damping Systems On Building Structures Subject to Seismic Effects Julius Marko May 26 ii Abstract In order to control the vibration response of high rise buildings during seismic events, energy
More informationNano Meter Stepping Drive of Surface Acoustic Wave Motor
Proc. of 1st IEEE Conf. on Nanotechnology, Oct. 283, pp. 4955, (21) Maui, Hawaii Nano Meter Stepping Drive of Surface Acoustic Wave Motor Takashi Shigematsu*, Minoru Kuribayashi Kurosawa*, and Katsuhiko
More informationSHAKING TABLE DEMONSTRATION OF DYNAMIC RESPONSE OF BASEISOLATED BUILDINGS ***** Student Manual *****
SHAKING TABLE DEMONSTRATION OF DYNAMIC RESPONSE OF BASEISOLATED BUILDINGS ***** Student Manual ***** A PROJECT DEVELOPED FOR THE UNIVERSITY CONSORTIUM ON INSTRUCTIONAL SHAKE TABLES http://wusceel.cive.wustl.edu/ucist/
More informationENS 07 Paris, France, 34 December 2007
ENS 7 Paris, France, 34 December 7 FRICTION DRIVE SIMULATION OF A SURFACE ACOUSTIC WAVE MOTOR BY NANO VIBRATION Minoru Kuribayashi Kurosawa, Takashi Shigematsu Tokyou Institute of Technology, Yokohama
More informationSelf Mass Damper (SMD): Seismic Control System Inspired by the Pendulum Movement of an Antique Clock
Self Mass Damper (SMD): Seismic Control System Inspired by the Pendulum Movement of an Antique Clock Ryota Kidokoro 1 ABSTRACT : 1 Ove Arup and Partners Japan Ltd Email: ryota.kidokoro@arup.com Completed
More informationPhysics 9e/Cutnell. correlated to the. College Board AP Physics 1 Course Objectives
Physics 9e/Cutnell correlated to the College Board AP Physics 1 Course Objectives Big Idea 1: Objects and systems have properties such as mass and charge. Systems may have internal structure. Enduring
More informationEXAMPLES OF SEISMIC RETROFITTING IN JAPAN
09031 The 2005 World Sustainable Building Conference, EXAMPLES OF SEISMIC RETROFITTING IN JAPAN Hiroshi YAMAMOTO 1 Yasuhiro TSUNEKI 2 Toshihiko KOHNO 3 1 Senior Structural Engineer, Structural Engineering
More informationPerformancebased Evaluation of the Seismic Response of Bridges with Foundations Designed to Uplift
Performancebased Evaluation of the Seismic Response of Bridges with Foundations Designed to Uplift Marios Panagiotou Assistant Professor, University of California, Berkeley Acknowledgments Pacific Earthquake
More informationDevelopment of Ushaped Steel Damper for Seismic Isolation System
UDC 624. 042. 7 Development of Ushaped Steel Damper for Seismic Isolation System Kazuaki SUZUKI* 1 Atsushi WATANABE* 1 Eiichiro SAEKI* 1 Abstract Seismic isolation system was widely admitted after HanshinAwaji
More information2016 IDEERS Rules for Graduate Teams. The List of Rule Revisions
1 of 12 The List of Rule Revisions Version No. Date Remarks V1 None 2 of 12 The content presented below serves as primary rules for this contest. However, if there are disputes that are not covered or
More informationMiss S. S. Nibhorkar 1 1 M. E (Structure) Scholar,
Volume, Special Issue, ICSTSD Behaviour of Steel Bracing as a Global Retrofitting Technique Miss S. S. Nibhorkar M. E (Structure) Scholar, Civil Engineering Department, G. H. Raisoni College of Engineering
More informationDispersion diagrams of a waterloaded cylindrical shell obtained from the structural and acoustic responses of the sensor array along the shell
Dispersion diagrams of a waterloaded cylindrical shell obtained from the structural and acoustic responses of the sensor array along the shell B.K. Jung ; J. Ryue ; C.S. Hong 3 ; W.B. Jeong ; K.K. Shin
More informationVERIFICATION OF THE METHOD FOR IMPROVING ACCURACY OF SIMPLIFIED SEISMIC RESPONSE ANALYSIS OF STEEL RIGID FRAME VIADUCTS
International Journal of Civil Engineering and Technology (IJCIET) Volume 6, Issue 10, Oct 2015, pp. 4661 Article ID: IJCIET_06_10_005 Available online at http://www.iaeme.com/ijciet/issues.asp?jtype=ijciet&vtype=6&itype=10
More informationHybrid simulation evaluation of the suspended zipper braced frame
Hybrid simulation evaluation of the suspended zipper braced frame Tony Yang Postdoctoral scholar University of California, Berkeley Acknowledgements: Andreas Schellenberg, Bozidar Stojadinovic, Jack Moehle
More informationSTUDY AND APPLICATION OF METALLIC YIELDING ENERGY DISSIPATION DEVICES IN BUILDINGS
10NCEE Tenth U.S. National Conference on Earthquake Engineering Frontiers of Earthquake Engineering July 2125, 2014 Anchorage, Alaska STUDY AND APPLICATION OF METALLIC YIELDING ENERGY DISSIPATION DEVICES
More informationSlide 10.1. Basic system Models
Slide 10.1 Basic system Models Objectives: Devise Models from basic building blocks of mechanical, electrical, fluid and thermal systems Recognize analogies between mechanical, electrical, fluid and thermal
More informationCH. 2 LOADS ON BUILDINGS
CH. 2 LOADS ON BUILDINGS GRAVITY LOADS Dead loads Vertical loads due to weight of building and any permanent equipment Dead loads of structural elements cannot be readily determined b/c weight depends
More informationFluid structure interaction of a vibrating circular plate in a bounded fluid volume: simulation and experiment
Fluid Structure Interaction VI 3 Fluid structure interaction of a vibrating circular plate in a bounded fluid volume: simulation and experiment J. Hengstler & J. Dual Department of Mechanical and Process
More informationAbaqus Technology Brief. Automobile Roof Crush Analysis with Abaqus
Abaqus Technology Brief Automobile Roof Crush Analysis with Abaqus TB06RCA1 Revised: April 2007. Summary The National Highway Traffic Safety Administration (NHTSA) mandates the use of certain test procedures
More informationDYNAMIC ANALYSIS ON STEEL FIBRE
International Journal of Civil Engineering and Technology (IJCIET) Volume 7, Issue 2, MarchApril 2016, pp. 179 184, Article ID: IJCIET_07_02_015 Available online at http://www.iaeme.com/ijciet/issues.asp?jtype=ijciet&vtype=7&itype=2
More informationVibration Course Enhancement through a Dynamic MATLAB Graphic User Interface
Vibration Course Enhancement through a Dynamic MATLAB Graphic User Interface Elizabeth K. Ervin 1 [Weiping Xu 2 ] Abstract From the string of a guitar to the radio wave, vibration occurs all the time and
More informationDynamic Analysis of the Dortmund University Campus Sky Train
Dynamic Analysis of the Dortmund University Campus Sky Train Reinhold Meisinger Mechanical Engineering Department Nuremberg University of Applied Sciences Kesslerplatz 12, 90121 Nuremberg, Germany Abstract
More informationA PERFORMANCE TEST STUDY ON CHINESE G4 LEAD RUBBER BEARINGS
13 th World Conference on Earthquake Engineering Vancouver, B.C., Canada August 16, 24 Paper No. 676 A PERFORMANCE TEST STUDY ON CHINESE G4 LEAD RUBBER BEARINGS Demin FENG 1, Cliff CHEN 2, Wenguang LIU
More informationSEISMIC RETROFITTING OF REINFORCED CONCRETE BUILDINGS USING TRADITIONAL AND INNOVATIVE TECHNIQUES
ISET Journal of Earthquake Technology, Paper No. 454, Vol. 42, No. 23, JuneSeptember 25, pp. 2146 SEISMIC RETROFITTING OF REINFORCED CONCRETE BUILDINGS USING TRADITIONAL AND INNOVATIVE TECHNIQUES Giuseppe
More informationFXA 2008. UNIT G484 Module 2 4.2.3 Simple Harmonic Oscillations 11. frequency of the applied = natural frequency of the
11 FORCED OSCILLATIONS AND RESONANCE POINTER INSTRUMENTS Analogue ammeter and voltmeters, have CRITICAL DAMPING so as to allow the needle pointer to reach its correct position on the scale after a single
More informationENERGY DISSIPATION DEVICES IN BRIDGES USING HYDRAULIC DAMPERS
ENERGY DISSIPATION DEVICES IN BRIDGES USING HYDRAULIC DAMPERS by E.A. Delis Bridge Engineer, Seismic Specialist Caltrans, Division of Structures Sacramento, CA 95816 R.B. Malla Assistant Professor University
More informationThe simulation of machine tools can be divided into two stages. In the first stage the mechanical behavior of a machine tool is simulated with FEM
1 The simulation of machine tools can be divided into two stages. In the first stage the mechanical behavior of a machine tool is simulated with FEM tools. The approach to this simulation is different
More informationLINEAR MOTOR CONTROL IN ACTIVE SUSPENSION SYSTEMS
LINEAR MOTOR CONTROL IN ACTIVE SUSPENSION SYSTEMS HONCŮ JAROSLAV, HYNIOVÁ KATEŘINA, STŘÍBRSKÝ ANTONÍN Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University Karlovo
More informationA NUMERICAL ANALYSIS BASED SUBSTITUTE METHOD FOR SHAKING TABLE TEST IN CONSIDERING OF THE SOILSTRUCTURE INTERACTION
A NUMERICAL ANALYSIS BASED SUBSTITUTE METHOD FOR SHAKING TABLE TEST IN CONSIDERING OF THE SOILSTRUCTURE INTERACTION Y.R. Wang 1, J.W. Dai 2, S.M. Zhan 3 and Y. Jiang 4 1 Ph.D Student, Dept. of Structural
More informationSEISMIC DESIGN. Various building codes consider the following categories for the analysis and design for earthquake loading:
SEISMIC DESIGN Various building codes consider the following categories for the analysis and design for earthquake loading: 1. Seismic Performance Category (SPC), varies from A to E, depending on how the
More informationDYNAMICAL ANALYSIS OF SILO SURFACE CLEANING ROBOT USING FINITE ELEMENT METHOD
International Journal of Mechanical Engineering and Technology (IJMET) Volume 7, Issue 1, JanFeb 2016, pp. 190202, Article ID: IJMET_07_01_020 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=7&itype=1
More informationFric3. force F k and the equation (4.2) may be used. The sense of F k is opposite
4. FRICTION 4.1 Laws of friction. We know from experience that when two bodies tend to slide on each other a resisting force appears at their surface of contact which opposes their relative motion. The
More informationPipe Vibration and Pressure Detection
Briiel & Kjaer ffi]j W i l Pipe Vibration and Pressure Detection 13069 I CONTENTS Page Pipe Vibration Literature 1 Detection of Pressure Variations in Thin Walled Pipes by Vibration Measurement 3 Pipe
More informationSample Questions for the AP Physics 1 Exam
Sample Questions for the AP Physics 1 Exam Sample Questions for the AP Physics 1 Exam Multiplechoice Questions Note: To simplify calculations, you may use g 5 10 m/s 2 in all problems. Directions: Each
More informationSEISMIC DESIGN OF HIGHWAY BRIDGES
Journal of Japan Association for Earthquake Engineering, Vol.4, No.3 (Special Issue), 2004 SEISMIC DESIGN OF HIGHWAY BRIDGES Kazuhiko KAWASHIMA 1 and Shigeki UNJOH 2 1 Member of JAEE, Professor, Department
More informationDESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES PART V SEISMIC DESIGN
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES PART V SEISMIC DESIGN MARCH 2002 CONTENTS Chapter 1 General... 1 1.1 Scope... 1 1.2 Definition of Terms... 1 Chapter 2 Basic Principles for Seismic Design... 4
More informationWork, Power, Energy Multiple Choice. PSI Physics. Multiple Choice Questions
Work, Power, Energy Multiple Choice PSI Physics Name Multiple Choice Questions 1. A block of mass m is pulled over a distance d by an applied force F which is directed in parallel to the displacement.
More informationOptimization of PID parameters with an improved simplex PSO
Li et al. Journal of Inequalities and Applications (2015) 2015:325 DOI 10.1186/s1366001507852 R E S E A R C H Open Access Optimization of PID parameters with an improved simplex PSO Jimin Li 1, YeongCheng
More informationA STUDY ON THE EFFECTS OF SURFACE WAVES GENERATED
A STUDY ON THE EFFECTS OF SURFACE WAVES GENERATED IN DEEP SEDIMENTARY BASINS DURING A MAJOR EARTHQUAKE K. Eto ), K. Motoki 2) and K. Seo 3) )Graduate student, Department of Built Environment, Tokyo Institute
More informationVARIATION OF SEISMIC RESPONSE OF MIDRISE RC BUILDINGS DUE TO SOIL STRUCTURE INTERACTION EFFECTS
International Journal of Civil Engineering and Technology (IJCIET) Volume 7, Issue 1, JanFeb 2016, pp. 220240, Article ID: IJCIET_07_01_019 Available online at http://www.iaeme.com/ijciet/issues.asp?jtype=ijciet&vtype=7&itype=1
More informationMechanical Analysis of Crossbeam in a Gantry Machine Tool and its Deformation Compensation
Send Orders for Reprints to reprints@benthamscience.ae The Open Mechanical Engineering Journal, 2015, 9, 213218 213 Open Access Mechanical Analysis of Crossbeam in a Gantry Machine Tool and its Deformation
More informationPSEUDO NEGATIVE STIFFNESS CONTROL OF THE BENCHMARK CABLESTAYED BRIDGE
PSEUDO NEGATIVE STIFFNESS CONTROL OF THE BENCHMARK CABLESTAYED BRIDGE Hirokazu IEMURA and Mulyo Harris Pradono Abstract Effectiveness of variable damper employing pseudo negative stiffness control on
More informationVibrations of a FreeFree Beam
Vibrations of a FreeFree Beam he bending vibrations of a beam are described by the following equation: y EI x y t 4 2 + ρ A 4 2 (1) y x L E, I, ρ, A are respectively the Young Modulus, second moment of
More informationSIMULATING THE DYNAMIC RESPONSE OF DIVINE BRIDGES
Pages 172185 SIMULATING THE DYNAMIC RESPONSE OF DIVINE BRIDGES Mark F. Green and Haiyin Xie ABSTRACT This paper presents dynamic models of three bridges tested as part of the recently completed Dynamic
More informationEFFECT OF POSITIONING OF RC SHEAR WALLS OF DIFFERENT SHAPES ON SEISMIC PERFORMANCE OF BUILDING RESTING ON SLOPING GROUND
International Journal of Civil Engineering and Technology (IJCIET) Volume 7, Issue 3, May June 2016, pp. 373 384, Article ID: IJCIET_07_03_038 Available online at http://www.iaeme.com/ijciet/issues.asp?jtype=ijciet&vtype=7&itype=3
More informationInteractive Animation: A new approach to simulate parametric studies
Interactive Animation: A new approach to simulate parametric studies Darwin Sebayang and Ignatius Agung Wibowo Kolej Universiti Teknologi Tun Hussein Onn (KUiTTHO) Abstract Animation is the one of novel
More informationSEISMIC RETROFITTING OF STRUCTURES
SEISMIC RETROFITTING OF STRUCTURES RANJITH DISSANAYAKE DEPT. OF CIVIL ENGINEERING, FACULTY OF ENGINEERING, UNIVERSITY OF PERADENIYA, SRI LANKA ABSTRACT Many existing reinforced concrete structures in present
More informationWeight The weight of an object is defined as the gravitational force acting on the object. Unit: Newton (N)
Gravitational Field A gravitational field as a region in which an object experiences a force due to gravitational attraction Gravitational Field Strength The gravitational field strength at a point in
More informationAnalysis of the Response Under Live Loads of Two New Cable Stayed Bridges Built in Mexico
Analysis of the Response Under Live Loads of Two New Cable Stayed Bridges Built in Mexico Roberto Gómez, Raul SánchezGarcía, J.A. Escobar and Luis M. ArenasGarcía Abstract In this paper we study the
More informationAcceleration levels of dropped objects
Acceleration levels of dropped objects cmyk Acceleration levels of dropped objects Introduction his paper is intended to provide an overview of drop shock testing, which is defined as the acceleration
More informationSEISMIC TESTING OF NONSTRUCTURAL COMPONENTS AND ASSESSMENT OF THE PRESCRIBED RESPONSE SPECTRUM
NCEE Tenth U.S. National Conference on Earthquake Engineering Frontiers of Earthquake Engineering July 5, Anchorage, Alaska SEISMIC TESTING OF NONSTRUCTURAL COMPONENTS AND ASSESSMENT OF THE PRESCRIBED
More informationSEISMIC CAPACITY OF EXISTING RC SCHOOL BUILDINGS IN OTA CITY, TOKYO, JAPAN
SEISMIC CAPACITY OF EXISTING RC SCHOOL BUILDINGS IN OTA CITY, TOKYO, JAPAN Toshio OHBA, Shigeru TAKADA, Yoshiaki NAKANO, Hideo KIMURA 4, Yoshimasa OWADA 5 And Tsuneo OKADA 6 SUMMARY The 995 Hyogokennambu
More informationAddress for Correspondence
International Journal of Advanced Engineering Technology EISSN 09763945 Research Paper DEVELOPMENT OF LOW COST SHAKE TABLES AND INSTRUMENTATION SETUP FOR EARTHQUAKE ENGINEERING LABORATORY C. S. Sanghvi
More informationKeywords Finite element, frequency response, gantry design, gantry machine, static and dynamic analysis.
Improvement on a CNC Gantry Machine Structure Design for Higher Machining Speed Capability Ahmed A. D. Sarhan, S. R. Besharaty, Javad Akbaria, M. Hamdi Abstract The capability of CNC gantry milling machines
More informationCHAPTER 6 WIND LOADS
CHAPTER 6 WIND LOADS C61 CHAPTER 6 WIND LOADS Outline 6.1 General 6.1.1 Scope of application 6.1. Estimation principle 6.1.3 Buildings for which particular wind load or wind induced vibration is taken
More informationEquivalent Spring Stiffness
Module 7 : Free Undamped Vibration of Single Degree of Freedom Systems; Determination of Natural Frequency ; Equivalent Inertia and Stiffness; Energy Method; Phase Plane Representation. Lecture 13 : Equivalent
More informationPhysics 111: Lecture 4: Chapter 4  Forces and Newton s Laws of Motion. Physics is about forces and how the world around us reacts to these forces.
Physics 111: Lecture 4: Chapter 4  Forces and Newton s Laws of Motion Physics is about forces and how the world around us reacts to these forces. Whats a force? Contact and noncontact forces. Whats a
More informationOnline Courses for High School Students 18889726237
Online Courses for High School Students 18889726237 PHYSICS Course Description: This course provides a comprehensive survey of all key areas: physical systems, measurement, kinematics, dynamics, momentum,
More information1) The time for one cycle of a periodic process is called the A) wavelength. B) period. C) frequency. D) amplitude.
practice wave test.. Name Use the text to make use of any equations you might need (e.g., to determine the velocity of waves in a given material) MULTIPLE CHOICE. Choose the one alternative that best completes
More informationVehicleBridge Interaction Dynamics
VehicleBridge Interaction Dynamics With Applications to HighSpeed Railways Y. B. Yang National Taiwan University, Taiwan J. D. Yau Tamkang University, Taiwan Y. S. Wu Sinotech Engineering Consultants,
More informationVibration Isolation in Data Centers
Vibration Isolation in Data Centers Vibrations in Data Centers Vibrations in Data Centers can be produced by nearby construction works, heavy traffic, railways or even the own cooling units inside or next
More informationw o r k o G f E A x  p r S i t n c e Elegance and Strength BBR HiAm CONA Strand Stay Cable Damping Systems
e o b a l N e t w o r k l o G f E A x  p r S i t n c e 1 9 4 4  s Elegance and Strength BBR HiAm CONA Strand Stay Cable Damping Systems 1 Cable vibration and damping Despite the wide use of cablestayed
More informationDESIGN DRIFT REQUIREMENTS FOR LONGPERIOD STRUCTURES
13 th World Conference on Earthquake Engineering Vancouver, B.C., Canada August 16, 2004 Paper No. 3292 DESIGN DRIFT REQUIREMENTS FOR LONGPERIOD STRUCTURES Gary R. Searer 1 and Sigmund A. Freeman 2 SUMMARY
More informationRetrofitting of RCC Structure WIH Strengthening of Shear Wall with External Post Tensioning Cables
Retrofitting of RCC Structure WIH Strengthening of Shear Wall with External Post Tensioning Cables Yogesh Ghodke, G. R. Gandhe Department of Civil Engineering, Deogiri Institute of Engineering and Management
More informationActive Vibration Isolation of an Unbalanced Machine Spindle
UCRLCONF206108 Active Vibration Isolation of an Unbalanced Machine Spindle D. J. Hopkins, P. Geraghty August 18, 2004 American Society of Precision Engineering Annual Conference Orlando, FL, United States
More informationREVISION OF GUIDELINE FOR POST EARTHQUAKE DAMAGE EVALUATION OF RC BUILDINGS IN JAPAN
10NCEE Tenth U.S. National Conference on Earthquake Engineering Frontiers of Earthquake Engineering July 2125, 2014 Anchorage, Alaska REVISION OF GUIDELINE FOR POST EARTHQUAKE DAMAGE EVALUATION OF RC
More informationDYNAMIC ANALYSIS OF THICK PLATES SUBJECTED TO EARTQUAKE
DYNAMIC ANALYSIS OF THICK PLATES SUBJECTED TO EARTQUAKE ÖZDEMİR Y. I, AYVAZ Y. Posta Adresi: Department of Civil Engineering, Karadeniz Technical University, 68 Trabzon, TURKEY Eposta: yaprakozdemir@hotmail.com
More informationCandidate Number. General Certificate of Education Advanced Level Examination June 2014
entre Number andidate Number Surname Other Names andidate Signature General ertificate of Education dvanced Level Examination June 214 Physics PHY4/1 Unit 4 Fields and Further Mechanics Section Wednesday
More informationTHE REPORT ON THE INVESTIGATION OF THE REACTORS AT FUKUSHIMA DAIICHI NUCLEAR POWER STATION (NO. 1)
THE REPORT ON THE INVESTIGATION INTO THE CURRENT SEISMIC SAFETY AND REINFORCEMENT OF THE REACTORS AT FUKUSHIMA DAIICHI NUCLEAR POWER STATION (NO. 1) May 2011 The Tokyo Electric Power Company, Inc. Index
More informationABSG Consulting, Tokyo, Japan Email: tkubo@absconsulting.co.jp 2. Professor, Kogakuin University, Tokyo, Japan 3
Application of Earthquake Early Warning System and Realtime Strongmotion Monitoring System to Earthquake Disaster Mitigation of a HighRise Building in Tokyo, Japan Tomohiro Kubo 1, Yoshiaki Hisada 2,
More informationPancaketype collapse energy absorption mechanisms and their influence on the final outcome (complete version)
Report, Structural Analysis and Steel Structures Institute, Hamburg University of Technology, Hamburg, June, 2013 Pancaketype collapse energy absorption mechanisms and their influence on the final outcome
More informationTall buildings. Florea Dinu. Lecture 13: 25/02/2014
Tall buildings Florea Dinu Lecture 13: 25/02/2014 European Erasmus Mundus Master Course Sustainable Constructions under Natural 520121120111CZERA MUNDUSEMMC Part II Multistorey buildings Tall buildings,
More information