Earthquake Response Analysis of Sites Using DEEPSOIL

Abstract

Earthquakes are one of the natural disasters that cause a huge amount of loss in terms of economy and human life. The local site conditions such as the topographic condition and soil profile play an important role in amplifying earthquake waves thereby causing severe damage at particular site compared to other site. To achieve safety against natural disasters like earthquake, it is necessary to construct the building considering geotechnical problems like site effects. The site effects usually amplify the seismic waves which can be assessed by ground response analysis studies. In the present study, 1D earthquake response analysis has been carried out in different sites of Andhra Pradesh capital seed area of 16.5 km2 in Amaravathi city in Guntur district. To evaluate site effects, borehole data up to a depth of 15 m has been collected. The earthquake time histories were used as input motion. The site amplification at surface has been assessed by using the equivalent linear approach in DEEPSOIL software. In addition to that, response spectra and variations of strain (%) time histories, PGA, and maximum strain (%) with depth were assessed. These results are used for dynamic analysis and design of earthquake-resistant structures. In this study, it is observed that waves are amplified at high level, and it results in high peak ground acceleration when compared to bedrock-level acceleration.