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The sixth revision of IS 1893 (Part 1): 2016, "Criteria for Earthquake Resistant Design Of Structures" have been published by Bureau of Indian Standards recently in December 2016. In this new code many changes have been included considering standards and practices prevailing in different countries and in India. This work aims at studying revisions in various clauses of new IS 1893 (Part 1): 2016 with respect to old IS 1893 (Part 1): 2002 and their effect especially, Separate response spectra for Equivalent static method and Response spectrum method. Old IS-18932002 has given one response spectra for Equivalent Static Method and Response Spectrum method for 4.0 s periods. Expressions are given for calculating design acceleration coefficient (Sa/g), for Rocky/hard soils, medium soils and soft soils. New IS 18932016 has given response spectra for Equivalent Static Method and Response Spectrum method separately for 6.0 s periods. Expressions are given for calculating design acceleration coefficient (Sa/g), for Equivalent Static Method and Response Spectrum method separately for Rocky/hard soils, medium soils and soft soils. It will change the Sa/g values. Definition of soft storey and weak storey, change in definition of mass, torsion and vertical irregularities has been modified. Importance factor of 1.2 has been specified in new code for residential buildings, in old code residential buildings were assigned importance factor of 1.0. Naturally, it will increase the design horizontal seismic coefficient Ah. New expression for Ta for building with RC structural walls, requirements for rigid and flexible diaphragm has been modified, modelling of unreinforced masonry infill walls as equivalent diagonal struts, etc. and critical comments on that are covered.

A Comparative Study of Various Clauses of New IS 1893 (Part 1):2016 and Old IS 1893 (Part 1):2002.