Revision of IS 1893: Proposal for an Alternative Soil Classification Scheme and Associated Intensity-Dependent Spectral Amplification Factors

AbstractThis paper provides an improved soil classification scheme and associated spectral acceleration response curves along with the site amplification factors for the ongoing revision of IS 1893 Part-1 [BIS (Bureau of Indian Standards). 2016. Criteria for earthquake resistant design of structures...

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Bibliographic Details
Published in:Natural hazards review 2022-05, Vol.23 (2)
Main Authors: Deoda, Vishal R, Adhikary, Shrabony
Format: Article
Language:English
Subjects:
Acceleration
Amplification
Bedrock
Classification
Classification schemes
Design
Earthquake resistance
Earthquakes
Forestry
Ground motion
Response analysis
Response spectra
Revisions
S waves
Seismic activity
Seismic design
Seismic velocities
Shear wave velocities
Soil
Soil classification
Soil improvement
Spectra
Technical Papers
Wave velocity
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Summary:AbstractThis paper provides an improved soil classification scheme and associated spectral acceleration response curves along with the site amplification factors for the ongoing revision of IS 1893 Part-1 [BIS (Bureau of Indian Standards). 2016. Criteria for earthquake resistant design of structures. IS 1893-1. New Delhi, India: BIS]. A ground response analysis of 124 sites across India is conducted using the nonlinear procedure of DEEPSOIL. In addition to the classical geotechnical parameters NSPT, Su, and plasticity index (PI), the improved soil classification scheme also uses the fundamental period of a site (T0) and the average shear wave velocity to the seismic bedrock, instead of only VS,30. New site amplification factors (i.e., Fa and Fv) are proposed for all site classes of the improved soil classification scheme and compared with the amplification factors of other national codes. Further, elastic design response spectra are proposed for the improved soil classification scheme by considering the proposed site amplification factors (i.e., Fa and Fv). The compatibility of the proposed elastic design response spectra with other national codes’ design spectra is further evaluated.
ISSN:1527-6988
1527-6996
DOI:10.1061/(ASCE)NH.1527-6996.0000554