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Importance of Site-Specific Dynamic Soil Properties for Seismic Ground Response Studies: Ground Response Analysis

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  • Shiv Shankar Kumar

    (Indian Institute of Technology Guwahati, Guwahati, India)

  • Arindam Dey

    (Indian Institute of Technology Guwahati, Guwahati, India)

  • A. Murali Krishna

    (Indian Institute of Technology Guwahati, Guwahati, India)

Abstract

This article highlights the implication of site-specific properties on seismic ground response studies. One-dimensional equivalent linear ground response analysis was carried out using site-specific dynamic properties of locally available soils of Guwahati city, and the results are compared with those obtained using existing strain-dependent dynamic properties. Acceleration time histories from three strong motions were used. It was observed that an input motion having a higher peak bedrock acceleration, utilizing experimentally obtained dynamic soil properties, exhibits 38% and 24% lower peak ground acceleration and peak spectral acceleration, respectively, in comparison to the results obtained using standard VD-SI soil models. The amplification characteristics of the strong motions are observed to be significantly influenced by the degradation of damping ratio beyond 1% shear strain. The results highlight the necessity of conducting GRA of any region considering its regional dynamic soil properties to obtain more realistic outcomes.

Suggested Citation

  • Shiv Shankar Kumar & Arindam Dey & A. Murali Krishna, 2018. "Importance of Site-Specific Dynamic Soil Properties for Seismic Ground Response Studies: Ground Response Analysis," International Journal of Geotechnical Earthquake Engineering (IJGEE), IGI Global, vol. 9(1), pages 78-98, January.
    • Handle: RePEc:igg:jgee00:v:9:y:2018:i:1:p:78-98
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