## Report on Equivalent Static Force Method of Earthquake

Subject: Geography, Science | Topics:

INTRODUCTION

As Bangladesh is located in a tectonically active much of the country and Significant damaging historical earthquakes have occurred in and around Bangladesh. For seismic lateral force may be calculated by two methods, namely, Equivalent Static Force Method and Dynamic Analysis. In Bangladesh, the number of high rise building is increasing day by day. For seismic lateral force calculation, Equivalent Static Force Method is most commonly used because of its simplification. But Equivalent Static Force Method is applicable for regular building with moderate height. For tall building or irregular structure, as the Code prescribed (BNBC), it is better to perform dynamic analysis. For all seismic regular structure it is necessary to perform a static analysis. Dynamic analysis is required in irregular cases and may be carried out in the form of a Time history analysis. Equivalent static force method is an empirical formula dependent on the height of the structure and also evaluates the height wise distribution of storey forces. The lateral forces in terms of the base shear and the static analysis of the structure for these forces provide the base shears. This method is used for calculation of seismic lateral forces for all structures. Ground motion time history developed for the specific site shall be representative of actual motions for the direction under consideration. Time history analysis is a step by step method of the dynamic response of a structure to a specified loading that may vary with time. The analysis may be linear or nonlinear. Time history analysis is used to determine the dynamic response of a structure to arbitrary loading. Now-a-days, different type of software is used to both static and dynamic analyses which help to perform easy analysis of the structure.

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