Site Amplification Factors and Acceleration Response Spectra for Shallow Bedrock Sites – Application to Southern India

Abstract

ABSTRACT Site amplification coefficients and acceleration design response spectra (ADRS) for the shallow sites in SI are derived based on non-linear site response analysis at 125 locations. Input motions are selected by considering the seismic hazard map for 475 years as return period and inputted at depth where VS ≥ 1,500 m/s. The new site factors, i.e. , , and , are proposed for Southern India (SI) by classifying the sites seismically considering National Earthquake Hazards Reduction Program (NEHRP). Using the calculated site factor, a new ADRS is developed for SI, which depends on peak ground acceleration and seismic site class. The compatibility of ADRS is further evaluated with NEHRP and BIS:1893.