SEISMIC PERFORMANCE OF STEEL BRACED FRAME STRUCTURES

Abstract

The progress of steel usage has provided a significant growth in construction industry. It is well established that steel provides better ductility ,stability and strength to the structure. The structure should be good enough to withstand seismic loads as well as lateral loads. This study aims to determine that the steel braces is one of the best method to reduce seismic forces specifically knee bracing which gives most of the lateral stiffness and flexural yielding. In this context a 6 storey knee steel frame structure with a plan of 9 m *9 m is utilized. To test the results that the knee braced framed structure gives better results than the bared frame. A 6 storey knee braced steel structure has been analyzed using ETABS software based on IS 1893:2002 guidelines. Equivalent static analysis method used for calculating base shear and lateral force on each storey and compared with bare frame. ETABS software results are compared with manual results.