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A preliminary proposal towards the revision of Indian seismic code considering site classification scheme, amplification factors and response spectra

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Abstract

This paper aims to improve the site classification scheme and amplification factors for the Indian Seismic Code. The present code IS 1893 (1):2016 ignores the amplification of effective peak ground acceleration due to the existence of soft soil layers. This results in lower design spectral accelerations on soil sites compared to those adopted by codes in other nations. 124 well documented sites from India are considered for ground response analysis using the equivalent linear procedure of DEEPSOIL. Time histories recorded from India and abroad are made spectrum compatible with the Type I spectra of Indian code, corresponding to all the seismic intensities with Effective Peak Ground Acceleration of 0.1 g, 0.16 g, 0.24 g and 0.36 g. Statistical methods are used to construct mean, mean plus standard deviation and mean minus standard deviation response spectra and amplification factors for the sites considered. Before the statistical analysis, each amplification factor curve is normalized with the effective site period (Tg) which exhibits a “characteristic peak at values of T/Tg not far from 1”. Normalized acceleration response spectra as well as period dependent soil amplification factors and equations are proposed for the new classification system. It is observed that the stratigraphy, impedance contrast, sediment thickness and site period play an important role in determining the soil amplification factors and therefore, should be considered in the future site classification schemes of the Indian Seismic Code.

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Acknowledgements

The financial assistance provided by the Science and Engineering Research Board (SERB) a statutory body of the Department of Science and Technology (DST), Government of India, under the Early Career Research Award No. ECR/2016/001316 is highly acknowledged. The authors would like to thank the two anonymous reviewers for their valuable and constructive comments to improve the manuscript.

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  1. Department of Civil Engineering, Visvesvaraya National Institute of Technology, Nagpur, India

    Vishal R. Deoda & Shrabony Adhikary

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Deoda, V.R., Adhikary, S. A preliminary proposal towards the revision of Indian seismic code considering site classification scheme, amplification factors and response spectra. Bull Earthquake Eng 18, 2843–2889 (2020). https://doi.org/10.1007/s10518-020-00806-2

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