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

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

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

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

Seismic Retrofitting of Solarino Buildings Design Construction - Testing

Solarino Buildings - 2002

Solarino Buildings: original foundation

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 ) 10.79 Elastic modulus for concrete, E c (kn/mm 2 ) 20.55 Concrete maximum parabolic strain, e co Concrete ultimate strain, e cu 0.2 % 0.35 % Fe B 38 k 450 375 Elastic modulus for steel, E s (kn/mm 2 ) 206 Steel ultimate strain, e su 1 % 13

Seismic resistance of the considered building Seismic zone a g,c/ g Soil type Tranverse direction Longitudinal direction A 43 66 1 0.35 B 28 44 C 24 36 A 60 92 2 0.25 B 40 61 C 33 51 A 100 153 3 0.15 B 66 102 C 55 85 A 300 460 4 0.05 B 200 306 C 166 256

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

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

Isolation Bearings High Damping Rubber Bearing Low Friction Sliding Bearing

Demolition of column element

Positioning of elastomeric bearing

Casting of foundation enlargement

Corner foundation enlargement

Perimetrical shelf casting

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

Free Vibration Tests

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

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

Sudden release device Fuse: Calibrated HS Steel rod Prototype

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

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

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

Free Vibration Tests

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. 21-46. [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, 2004. [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, 2004. [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, 2006. [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.