Seismic Behavior of Soft First Storey

Abstract

In the aftermath of recent North Kashmir Earthquake of October 8, 2005, there is increased awareness for the need to evaluate and improve the seismic performance of multistoried reinforced concrete buildings. There are several numbers of factors affecting the behavior of building. Stiffness irregularity in vertical direction is one of them, as a result of which soft storey is formed. In the dissertation work a parametric study is performed on multistoried building with soft first storey, located in seismic zone IV. It is intended to describe the performance characteristics such as stiffness, shear force, bending moment, drift. The study is carried out on a building with the help of different mathematical models considering various methods for improving the seismic performance of the building with soft first storey. Analytical models represent all existing components that influence the mass, strength, stiffness and deformability of structure. The equivalent static and multimodal dynamic analysis is carried out on the entire mathematical 3D model using the software SAP2000 and the comparisons of these models are presented. Finally, the performance of all the building models is observed in high seismic zone V. Keywords: Soft storey, Problem, Parametric study, Earthquake Analysis, IS 1893:2002 provisions.