Nonlinear and Equivalent Linear Site Response Analysis for the Bodrum Region

Abstract

The change in the intensity and the frequency content of the motion due to the propagation of seismic waves in soil deposits has a direct impact on the response of structures during earthquake events. In most cases, One dimensional (1D) site response analysis is performed to assess the effect of soil conditions under ground shaking. Frequency domain equivalent linear and time domain nonlinear analyses are the most common approaches for performing 1D seismic site response analysis. The Aegean region and the surrounding area are considered to be one of the most seismically active regions of the world. Recently, the magnitude 6.7 earthquake hit Turkey's western coast and was felt in the resort towns of Bodrum and Datça in Muğla province. A good knowledge on the site effects of the original site in Bodrum is of primarily importance from the engineering point of view. In this study, one-dimensional ground response analyses for a specific site in Bodrum city was performed with using a nonlinear and equivalent linear site response approaches. In order to estimate the ground response of the original site, DEEPSOIL software which is a one-dimensional site response analysis program was used. In addition, the results of the two different approaches were compared. Results of the two original sites under two different earthquake motions are given in terms of peak ground accelerations (PGA) and spectral accelerations. These site effects should be considered when specifying ground shaking levels for seismic designs to prevent earthquake damage.