Akademik Veri Yönetim Sistemi
10th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Rodos, Yunanistan, 15 - 18 Haziran 2025, ss.1-5, (Tam Metin Bildiri)
The city of Istanbul was seismically instrumented by a dense Rapid Response Network (IRRN) and Geotechnical Downhole Arrays (IGDA) after the 1999 Mw=7.6 Izmit Earthquake. Especially, the south coast soils of Istanbul European Side composed of Cenozoic aged younger formations are expected to be affected by a probable earthquake more, compared to the other parts of the city. Along a 10 km long route, response spectral amplification factors are calculated depending on a simulation-based method. The method includes 1-D site response analyses of 1000 shear wave velocity (Vs) profiles produced by Monte Carlo simulation, and the assignment of a best-fit Vs profile due to the least squared error between recorded ground motions and the modelled ones. The best-fit Vs profile is chosen due to the recorded motions of near field earthquakes Rjb<100 km with M<4.8. The optimized Vs profile is used for modelling the response spectral accelerations by scaled bedrock motions of downhole arrays due to expected bedrock PGA rates of 10% probability of exceedance in 50 years defined in Turkish Earthquake Building Code (TEBC, 2018). A scaling procedure for bedrock PGAs is applied to model nonlinear response spectral amplification factors. The south coast soil layers of Istanbul exceed the design spectrum for a return period of T=475 years (10% probability of exceedance in 50 years) especially at Zeytinburnu district. The proposed method can be applied to any instrumented seismically active regions to reveal the response spectral performance.