Simulation-based Site Amplification Factors for Medium Stiff-to-Stiff Sites in Southern Coast of Izmir City

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İlhan O., Zülfikar A. C.

3rd EUROPEAN CONFERENCE ON EARTHQUAKE ENGINEERING & SEISMOLOGY, Bucuresti, Romania, 4 - 09 September 2022, pp.2185-2192, (Full Text)

  • Publication Type: Conference Paper / Full Text
  • City: Bucuresti
  • Country: Romania
  • Page Numbers: pp.2185-2192
  • Ankara Yıldırım Beyazıt University Affiliated: Yes

Abstract

FS (0.2 s) and F1 (1.0 s) factors used for modifying the design spectrum (VS30 = 760 m/s) of Turkish Earthquake Building Code (TEBC) relative to various site conditions were originally developed using a database governed by Western United States strong ground motions. Thus, these values might not reflect the site amplification at regions of interest in Turkey and need to be tested through site-specific studies. This paper performed a small-scale parametric study of 1,320 one-dimensional nonlinear and equivalent-linear ground response analyses using 15 medium stiff-to-stiff site profiles from the southern coast of Izmir and 184 motions to produce simulated amplification factors. The simulation-based F1 from both analyses with mid-to-high intensity motions are noticeably higher than the corresponding values in the TEBC, resulting in the fact that the design spectra computed using simulated factors cover the code-based spectra for periods greater than 0.5 s which includes the range of resonance periods of most mid-to-high rise structures. Such observation indicates that a more comprehensive and large-scale parametric study incorporating a wide range of site and motion conditions would be recommended.