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Site Response Study and Amplification Factor for Shallow Bedrock Sites

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Abstract

Amplification is a key paramter considered to account modifcation of seimic wave in the soil for earthquake resistance design of structure placed on soil. Initially, earthquake wave amplifications are related with shear wave velocity (Vs) ratio of soil and foundation layer, and then it was related to average value of Vs up to 30 m (V30s ). Application of V30s concept to represent amplification in shallow bedrock sites is questionable and has rock velocity added to soil velocity. In this study, shallow bedrock sites in Bengaluru, Chennai, Coimbatore and Vishakhapatnam has been analyzed to understand amplifications and its proximity to V30s . The site response calculations are done using one-dimensional nonlinear approach. Intraplate recordings from around the world suitable for the study area are selected. For comparison with known data, the amplification factors are evaluated considering the period ranges similar to international codes. Then, considering spectral signatures from response spectra for all site rock and surface motions, the factors are calculated for period range 0.01–0.06 s and 0.05–1.0 s. Based on the study, only one mid-period amplification factor has been proposed. This amplification factor represents the significant amplification of the site. Acceleration spectra show similar trends for different site classes irrespective of the fact that profiles are selected based on Vs values or SPT-N values. This is observed over a wide range of results and indicates shear modulus as an influencing parameter. Comparison of spectral signatures for different site classes suggests that amplification reduces as the modulus of the soil column increases. Thus, it may be appropriate to classify sites based on shear modulus of soil column.

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Acknowledgements

Authors thank ‘‘Board of Research In Nuclear Sciences (BRNS),’’ Department Of Atomic Energy (DAE), Government of India for funding the project titled ‘‘Seismic site classification for Indian shallow soil deposits’’ (Ref No. Sanction 615 No 2012/36/33-BRNS-1656 dated 10/10/12).

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Authors and Affiliations

  1. Department of Civil Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab, 147004, India

    Aditya Parihar

  2. Department of Civil Engineering, Indian Institute of Science, Bangalore, 5600012, India

    P. Anbazhagan

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  1. Aditya Parihar
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  2. P. Anbazhagan
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Correspondence to Aditya Parihar.

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Parihar, A., Anbazhagan, P. Site Response Study and Amplification Factor for Shallow Bedrock Sites. Indian Geotech J 50, 726–738 (2020). https://doi.org/10.1007/s40098-020-00410-w

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