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Seismic risk assessment for the mega-city of Istanbul: Ductility, strength and maximum interstory drift demands |
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| Authors: | Pelin Gundes Bakir Guido De Roeck Geert Degrande Kevin KF Wong |
| Institution: | aDepartment of Civil Engineering, Istanbul Technical University, Pembegul sok., Pelin apt. No:20 D:5 Suadiye, Istanbul, Turkey bDepartment of Civil Engineering, K.U.Leuven, KasteelparkArenberg 40, B-3001 Leuven, Belgium cDepartment of Civil and Environmental Engineering, University of Utah, Salt Lake City, UT 84112.1102, USA |
| Abstract: | This study investigates the seismic demands due to the catastrophic 1999 Mw=7.4 Kocaeli and the Mw=7.1 Duzce earthquakes. The inelastic response spectra for the Kocaeli and Duzce earthquakes are investigated for systems with known strength and ductility. An analytical fiber element model is developed for a typical reinforced concrete building in Turkey. The interstory drifts are calculated from nonlinear dynamic analysis using 26 recorded strong-motion data from the 1999 Kocaeli and the Duzce earthquakes. In the dynamic analysis, the structural members are modeled by employing distributed plasticity fiber elements and both geometrical as well as material nonlinearities are taken into account. This study shows that the ductility and interstory drift demands due to the Kocaeli and the Duzce earthquakes were very severe (well above the code prescribed values) even for moderately inelastic structures. It is apparent from the results that the forward directivity effect is the most influential factor on the interstory drift demand. Both the distance to the fault rupture and the site conditions affect seismic demands, but the site conditions and the local topography are more influential than the distance from the fault rupture. This study shows that substantial damage should be expected in a future earthquake at all districts of Istanbul, but especially at Avcilar, Cekmece, Fatih, Bakirkoy and the Zeytinburnu districts. It is also shown that base isolation may substantially improve the performance of a structure in the inelastic domain and base isolated structures may be designed for lower minimum lateral strengths and higher strength reduction factors. |
| Keywords: | Nonlinear response history Nonlinear dynamic analysis Butterworth filters Strong-motion accelerograms Earthquake Inelastic response spectra Base isolation Earthquake damage estimation Seismic vulnerability |
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