Projektarbeiten 3. Sem. MSc Bauing - HS Prof. Dr. Bozidar Stojadinovic

Transcription

1 Leiter der Prof. Dr. Bozidar Stojadinovic Institut: Fachbereich: IBK Structural Dynamics and Earthquake Engineering Anzahl Themen: 13 Themen direkt auf der Website der Professur/des Instituts veröffentlicht Link:

2 Titel der Dynamic response of a rectangular plate supported on four cylindrical columns allowed to uplift and roll Dr. Michalis Vassiliou Mr. Jonas Bachmann Letting a structure uplift during an earthquake works as a mechanical fuse and limits the forces trasmitted to the structure. Such rocking mechanism has proven its effectiveness as ancient temples have survived earthquakes for more than 2,500 years. There is ongoing research on applying this mechanism in bridge design ( The 2dof equation of motion of a rigid rectangular plate supported on 4 rigid cylinidrical columns (which are able to uplift and roll on their circumference) will be derived and solved numerically (with Matlab). Time perimitting, a prestressing tendon will be added to the columns (in Matlab) to restrain their motion. 2

3 Titel der Seismic resilience of a civil instrastructure system Mr. Max Didier, Mr. Li Sun A civil infrastructure system undergoes a steep drop in functionality immediately after an earthquake, followed by a slow (and expensive) recovery. The objective of this project is to model the vulnerability and recovery of a typical civil infrastructure system (an electrical power system, a water supply network, an interntet fiber-optic network, a portfolio of residential buidings in a city, etc.) considering the interdependences among the infrastructure systems and the traffic road network. A supply/demand compositional framework and an agent-based model will be used. The work will be done in Matlab. The particular civil infrastructure system will be chosen at the beginning of the semester, depending on the available data. Seismic Design I 3

4 Titel der Comparison of Optimal Financial and Engineering Strategies for Earthquake Risk Management in Europe Dr. Panos Galanis Seismic risk to building structures can be mitigated using structural engineering (seismic retrofit) and/or financial engineering (earthquqke insurance) measures. An optimal choioce depens on the seismic hazard, on the seismic vulnerability of the structures, and on the market conditions (interest rates, rental yield, intended duration of ownership). The goal of this project is to consider different seismic hazard and building type combinations in Europe using the data from the SHARE seismic hazard project and the Open Quake structural vulnerability database and to develop a map of optimal sesmic risk mitigation strategies using an approach developed at the ETH Risk Center. The work will consist of developing a number of representative hazard/vulnerability combinations and solving for the optimal seismic risk mitigation strategy using a Matlab model. Seismic Design I 4

5 Titel der Is Peak Ground Displacement a good earthquake intensity measure for rocking structures? Dr. Michalis Vassiliou and Mr. Jonas Bachmann Letting a structure uplift (rock) during an earthquake works as a mechanical fuse and limits the forces trasmitted to the structure. Therefore, rocking can be used a seimic response modification strategy for both entire structures (such a Greek temples), and sensitive equipment inside structures. There is a consensus that Peak Ground Acceleration and elastic Spectral Acceleration are not good intensity measures for rocking structures. There is indication that the peak displacement of a rocking structure scales well with Peak Ground Displacement (PGD). The scope of this project is to examine the suitability of PGD to serve as an intensity measure for rocking structures. The work involves analytical modeling and simulation using Matlab. Seismic Design I 5

6 Titel der Seismic Vulnerability Assessment of an Existing Reinforced Concrete Bridge Dr. Marco Broccardo and Dr. Giuseppe Abbiati The goal of the project is to evaluate the seismic vulnerability of a existing reinforced concrete bridge that is located in the central part of Italy. The main tasks of this work are: i) ground motions selections vs simulated ground motions ii) definition of limit states; iii) fragility analysis. Different methodologies will be explored e.g., classical fragility computation based on MLE, Kriging metamodeling and Tail Equivalent Linearization Method (TELM). Numerical simulations will be implemented using Matlab and OpenSees software. Seismic Design I Finite Element Modeling Structural Reliabilty 6

7 Titel der Development of a Controller Prototype for the ETH Multi-Axial Subassemblage Testing (MAST) Setup Dr. Giuseppe Abbiati The goal of the project is to prototype a control strategy for the ETH MAST setup, which consists on a 15 x 11 m crosshead loading frame equipped with 8 hydraulic actuators. The control strategy will calculate actuator setpoints so as to impose 3-translation + 3-rotation to the tested specimen. The main tasks of the project are: i) review of state-of-art control strategies for MAST setups; ii) numerical modeling of the ETH MAST; iii) implementation of the control strategy in the Matlab/Simulink environment. 7

8 Titel der Uncertainty quantification of the hybrid simulation test method Dr. Giuseppe Abbiati and Dr. Stefano Marelli Hybrid simulation is a structural testing method where the specimen consists of a physical part, tested in the lab, a numerical part implemented in a computer. The test is conducted under computer control. The influence of uncertainties of the model and the excitation and experimental errors is significant, but has not been fully quantified. The goal of this project is to develop a stochastic description of a typical test setup (with a linear elastic specimen and uncertain boundary conditions and excitation) and use spectral methods for uncertainty quantification to design an optimal hybrid simulation experimental campaign. This project is particularly useful for students who want to continue studying the applications of uncertainty quantification in structural engineering. Structural reliablity and risk analysis This project is conducted under co-supervision of Professor Bruno Sudret. 8

9 Titel der Development of Damage Fragiity Relations for Plastered Unreinforced Masonry Walls Mr. Max Didier and Dr. Marco Broccardo The goal of this project is to investigate the damaging potential of earthquakes induced and/or triggered by hydraulic fracturing done to find new sources of energy in Switzerland. Several 1.2mx1.2m unreinforced masonry walls typical for modern Swiss residential building construction will be tested in the IBK Structures Laboratory (Bauhalle). The loading of the specimens will be designed to similated the expected induced (somewhat smaller) and triggered (somewhat larger, involving and existing fault) earthquakes. The Digital Image Correlation method will be used to detect and measure the damage. The data will be analyzed statistically to develop damage fragility curves. Seismic Design I 9

10 Titel der Calibration of Seismic Compliance Factors for Existing Buildig Structures using Uniform Hazard Spectra and Strength-Ductility Relations Mr. Anastasios Tsiavos Seismic evaluation of existing buildings is based on SIA 2018 document where the so-called compliance factors are used to reduce the magnitude of base shear used in the builidng strength evaluation. In this project, compliance factors for typical structural systems (moment frame, shear wall, braced frame) will be re-calibrated using the 2014 Swiss uniform hazard spectra and the displacement-based evalaution approach using modern strength-ductility relations. Work will be done using Matlab and finite element software such as SAP2000. Seismic Design I 10

11 Titel der Evaluaton of Seisimc Bearing Displacement Demand for a Typical Swiss Highway Overpass Bridge Ms. Micaela Pilotto The seismic risk evalautions of Swiss highway overpass bridges often find the existing bearings lack displacement capacity. The objective of this project is to evalute the earthquake-induced bearing dispalcement and force demands for a typical Swiss highway overpass bridge (location to be determined, like on A13) using the 2014 Swiss uniform hazard spectra and a brige model developed in finite element analysis software such as SAP2000. Finite Element Method Seismic Design I 11

12 Titel der Strategies to enhance the performance and the resilience of critical infrastrctures along the life cycle Dr. Simona Esposito Critical infrastructure systems are the systems that provide the means for our society to function safely and achieve the expected quality of life. Despite the fact that the infrastructure system components are designed to withstand rare catastrophic events, such as earthquakes, we witnessed significant damage and disruption after recent earthquakes in large urban areas (e.g. Christchurch, New Zealand). Stress tests for civil infrastructure systems have recently been proposed as a way to evaluate how large such damage and disruptions could be. In particular, the main objective of a stress test is the definition of mitigation strategies to improve the perfomance and the resilience of a CI against extreme events. These strategies may be formulated identifying the events that most likely cause a given level of loss value, defined as not acceptable for the CI and the society. The main goal of the project is to develop strategies to mitigate the impact of disastrous events on the perfomance and on the recovery process of the CIs during the lifetime starting from stress-test findings.the proposed strategies will be formulated thruough a disaggregation analysis and will be demonstrated using a spatial distributed infrastructural system. Seismic Design Structural reliablity and risk analysis Maximum two students in a group 12

13 Titel der Regional seismic hazard and design criteria for critical facilitates and infrastructures Dr. Simona Esposito Dr. Marco Broccardo Performance based seismic design defines, for a given structure and location, the acceptable level of risk the structure should be designed for.the seismic hazard environment of the structure is quantified using by performing a probabilistic seismic hazard analysis (PSHA) at the location of the structure. In case of spatially distributed facilities, such as infrastructural networks, local PSHA is, however, inapplicable, since the geographic distribution of the network cannot be correctly represented. Simply, infrastructure system risk cannot be controlled point-wise as it is for a single facility/component. The objective of this project is to define novel regional hazard analysis coupled with system-level performance design criteria in order to establish seismic performance design objectives for different types of spatially distributed systems. The proposed methods and design criteria will be demonstrated using a fictitious geographic region and a spatial distributed infrastructural system in it. Seismic Design Structural reliablity and risk analysis Maximun two students in a group 13

14 Titel der Analysis of the impact of earthquake lifelines disruptions on business interruption Dr. Simona Esposito Dr. Panos Galanis Estimating the risk of business organizations resulting from earthquakes requires a deep understanding of the factors that contribute to business interruption. The identification of these factors and of the interactions between the various business entities represents the starting point to evaluate the losses (direct and indirect) that can occur after a disastrous event, allowing the quantification of how perturbations caused by a natural hazard reflect and propagate through the whole chain. The aim of the project is to develop appropriate tools to assess the seismic risk to businesses considering the main factors that contribute to business interruption. In particular, the project will be focused on the analysis of the interactions and interdependencies among the principal components of this kind of systems, with a special attention to business interruptions originating outside the business property, such as civil infrastructure lifeline failures. For verification, the proposed framework will be applied to businesses of different scale of a selected business sector. Seismic Design Structural reliablity and risk analysis Maximum two students in a group 14