Seismic Design of New Strategic Buildings and Seismic Retrofitting of Existing Vulnerable Buildings

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1 Seismic Design of New Strategic Buildings and Seismic Retrofitting of Existing Vulnerable Buildings G. Oliveto [1], M. Granata [2],G. Ferraro [1], N. D. Oliveto [1] [1] University of Catania [2] SAP Studio Engineering, Catania

2 Seismic Design of New Strategic Buildings and Seismic Retrofitting of Existing Vulnerable Buildings 1. Seismic retrofitting of existing vulnerable buildings 2. Seismic design of new strategic buildings

3 Seismic retrofitting of existing vulnerable buildings 1. Solarino residential buildings 2. Santa Venerina residential building 3. Multi Task Operation Centre COM Catania

4 Seismic Retrofitting of Solarino Buildings Design Construction - Testing

5 Solarino Buildings

6 Solarino Buildings: original foundation

7 Mechanical properties of concrete and steel Concrete characteristic cubis strength, f cu (N/mm 2 ) Concrete ultimate design strength, 0.83 f cu (N/mm 2 ) Steel type Steel characteristic ultimate strength, f su (N/mm 2 ) Steel characteristic yield strength, f sy (N/mm 2 ) Elastic modulus for concrete, E c (kn/mm 2 ) Concrete maximum parabolic strain, e co Concrete ultimate strain, e cu 0.2 % 0.35 % Fe B 38 k Elastic modulus for steel, E s (kn/mm 2 ) 206 Steel ultimate strain, e su 1 % 13

8 Seismic resistance of the considered building Seismic zone a g,c/ g Soil type Tranverse direction Longitudinal direction A B C A B C A B C A B C

9 The Retrofitting Design: Strengthening of the superstructure First floor First storey Second and third storeys Fourth storey

10 Layout of the hybrid seismic isolation system including 12 HDRB and 13 LFSB Laminated HDRB rubber bearing Low-friction LFSB bearing

11 Isolation Bearings High Damping Rubber Bearing Low Friction Sliding Bearing

12 Demolition of column element

13 Demolition of column element

14 Positioning of elastomeric bearing

15 Casting of foundation enlargement

16 Corner foundation enlargement

17 Perimetrical shelf casting

18 Perimetrical shelf casting

19 Low-friction bearing in position still bracketed; provisional supports in the backgroun

20 Free Vibration Tests

21 Testing Apparatus Data acquisition system Electric connection cables Reaction wall Hydraulic jack Fuse Load cell Loading device Building Measurement equipment 15 acceleration transducers 12 displacement transducers

22 Schematic view of loading device HYDRAULIC JACK SUDDEN RELEASE DEVICE LOAD CELL REACTION WALL

23 Sudden release device Fuse: Calibrated HS Steel rod Prototype

24 Load Cell on the Head of Loading Device NOVATECH MODEL F205-CFR0K0

25 Location of the measuring stations PENNY&GILES Linear Displacement Sensors MODEL SLS320

26 Schematic Accelerometers Layout PCB-Piezotronics Seismic Acceleration Transducer MODEL 393B31 Measuring stations and acquisition channels

27 Free Vibration Tests

28 Free Vibration Tests

29 Free Vibration Tests

30 Free Vibration Tests

31 Free Vibration Tests

32 Free Vibration Tests

33 Free Vibration Tests

34 Free Vibration Tests

35 Free Vibration Tests

36 Free Vibration Tests

37 Free Vibration Tests

38 Literature [1] G. Oliveto, M. Marletta, Seismic Retrofitting of Reinforced Concrete Buildings using Traditional and Innovative Techniques, ISET Journal of Earthquake Technology, Paper No. 454,Vol. 42, No 2-3, June-September 2005, pp [2] G. Oliveto, I. Caliò, M. Marletta, Retrofitting of Reinforced Concrete Buildings not Designed to withstand Seismic Action: A Case Study using Base Isolation, Paper No. 954, 13th WCEE, Vancouver, [3] G. Oliveto, M. Granata, G. Buda, P. Sciacca, Preliminary results from full-scale free vibration tests on a four story reinforced concrete building after seismic rehabilitation by base isolation, JSSI 10th Anniversary Symposium on Performance of Response Controlled Buildings, Yokohama, Japan, [4] G. Oliveto and G. Scalia, Free-Vibration Tests Following Seismic Retrofitting by Base Isolation on the Solarino Buildings, Paper No. 1254, Proceedings of the 8th U.S. NCEE, San Francisco, [5] G. Oliveto and G. Scalia, Wavelet Identification of Base Isolated Buildings: Application to the Solarino Buildings, ANIDIS 2007, Pisa, Italy. [6] N. D. Oliveto, G. Scalia, G. Oliveto, Dynamic Identification of Structural Systems with Viscous and Friction Damping, to appear in the Journal of Sound and Vibration. [7] N. D. Oliveto, G. Scalia, G. Oliveto, Improved Dynamic Identification of Base Isolated Buildings using the Least Squares Method, AIMETA 2007, Brescia, Italy.

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