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A Site Specific Study on Evaluation of Design Ground Motion Parameters

Author

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  • A. Boominathan

    (Indian Institute of Technology Madras, India)

  • S. Krishna Kumar

    (Indian Institute of Technology Madras, India)

Abstract

Design ground motions are usually developed by one of the two approaches: site-specific analyses or from provisions of building codes. Although contemporary codes do consider approximately the site effects, they provide more conservative estimates. Hence it is preferred to carry out site specific analysis which involves both the seismic hazard analysis and ground response analysis. This article presents a site specific analysis for a seismically vulnerable site near Ahmedabad, Gujarat. The seismic hazard analysis was carried out by DSHA approach considering seismicity and seismotectonics within 250km radius. The site is predominantly characterized by deep stiff sandy clay deposits. Extensive shear wave velocity measurement by cross hole test is used for site classification and ground response analysis. The ground response analysis was carried out by equivalent linear approach using SHAKE2000. It is found that the deep stiff soil site considered is found to amplify the ground motion. The site specific response spectra obtained from RRS analysis is compared with the codal provision which reveals high spectral acceleration in site specific spectra for mid period range.

Suggested Citation

  • A. Boominathan & S. Krishna Kumar, 2010. "A Site Specific Study on Evaluation of Design Ground Motion Parameters," International Journal of Geotechnical Earthquake Engineering (IJGEE), IGI Global, vol. 1(1), pages 1-24, January.
    • Handle: RePEc:igg:jgee00:v:1:y:2010:i:1:p:1-24
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