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

Shiv Shankar Kumar, Arindam Dey and A. Murali Krishna
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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

International Journal of Geotechnical Earthquake Engineering (IJGEE), 2018, vol. 9, issue 1, 78-98

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.

Date: 2018
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