COMPARATIVE STUDY OF THE STATIC AND TIME HISTORY ANALYSIS OF EXISTING RC FRAME

Abstract: Considerable improvement in earthquake resistant design has been observed in recent past. As a result Indian seismic code IS: 1893 has also been revised in year 2002, after a gap of 18 years. This paper presents the seismic load estimation for multistorey building as per IS: 1893-2002 recommendations. The existing multistorey RC framed buildings of six storey is considered and analyzed. The Static and Dynamic analysis of the building is done, in Dynamic analysis lateral Load is considered. The Dynamic analysis is done by Time history method. This analysis for building and the results are used to compare the seismic parameters such as storey shear, base shear, storey displacement, bending moment and Axial force, computed as per the seismic code IS 1893-2002. The seismic forces, computed by IS: 1893-2002 are found to be significantly higher than that of static analysis except the base shear. The difference varies with structure properties. It is concluded that such study needs to be carried out for individual structure to predict seismic vulnerability of existing RC framed buildings that were designed using earlier code and due to revisions in the codal provisions may have rendered unsafe.

Keywords: Static Analysis, Dynamic Analysis, Time History Analysis, Earthquake Loads, IS 1893-2002, Existing RC building, Multistorey building.