Abstract
Geotechnical earthquake engineers have been trying to determine the most appropriate solution techniques for ground response analysis under earthquake loadings. This paper presents the importance of the adequate soil behavior model to simulate earthquake site response analysis. The influence of nonlinearity and linearity of soils on the site response is also investigated. Many methods have been proposed for the analysis of one-dimensional ground response such as nonlinear methods and equivalent linear with reduced modulus. Using 13 well known earthquake records and geotechnical information of sand in the Qeshm Island (Iran) and classification of earthquakes based on seismic parameters, the influence of each parameter on the Response spectra and Fourier Spectrum of surface of ground becomes evident. Analysis was done using two softwares; EERA (equivalent linear analysis) and NERA (nonlinear analysis) and compared. Finally, output of the software is compared with the reference result on site.
Highlights
The earthquake motions at bedrock level can be modified in frequency contents and amplitude as the seismic waves are transmitted through a soil deposit
The main purpose of site response analysis is to determine the wave amplitude at the top of soil layers based on a rock outcropping motion
One-dimensional site response analysis shown in Figure 1, specifies engineering applications to evaluate the characteristics of earthquake ground motions
Summary
The earthquake motions at bedrock level can be modified in frequency contents and amplitude as the seismic waves are transmitted through a soil deposit. One-dimensional site response analysis shown, specifies engineering applications to evaluate the characteristics of earthquake ground motions. Assessment of the world's major earthquake damage indicates that site conditions have a significant effect on the distribution of damages in different areas It seems site influence is dependent on seismic parameters (peak acceleration, duration of strong ground motions, frequency content) of earthquake. The Equivalent-Linear Earthquake Response Analyses (EERA) Model was used to study the effect of local soil conditions on ground motion parameters. Response spectrum is the most useful and important tool for understanding the characteristics of strong ground motions and is widely used in earthquake engineering. Site response spectra calculated in this study (for Qeshm Island) due to various earthquakes was compared to response spectra of Gheshm Island presented in the National Building Code of Iran [14] named “standard response spectra” in this paper
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