Comparing the empirical time period formula given in seismic code of different countries with Indian seismic code IS 1893:2002

Abstract

Tall building construction is booming in India. There are several earthquake safety issues involved in planning, designing and constructing these buildings. Some issues related to seismic behaviour are still not resolved even in developed countries, like USA and Japan. Researchers all over the world are continuously working towards development of latest techniques for improving earthquake safety of tall building. The situation in India is that there are few codes which specify guidelines for earthquake resistant design of structures. However, the guidelines given in this code are useful for regular and relatively small, low-rise buildings. When it comes to tall buildings, every structure is special, several parameter needed to be considered. One such parameter is T. Existing empirical natural period equation given in IS 1893 is suitable only for small to medium rise buildings. There is a serious need for proposing equation for high rise buildings. In this paper an attempt is made to compare empirical equations for natural period of different countries. Study gives that there is a need to propose the new time period formula exclusively for Tall structure based on Indian condition.