ANALYSIS OF BRACED UNSYMMETRICAL RCC BUILDING USING SAP2000.
Keywords:
Seismic behavior, RCC Building (G 30), General Building (Unbraced) and Braced building, SAP2000.Abstract
The study of Earthquake Engineering has existence from many years. Earthquake Engineers have made significant contributions to the seismic safety of several important structures in the country. Braced frames, besides other structural systems, such as moment resisting frames or shear walls, have been an effective and valuable method to enhance structures against lateral loads. In seismic excitations, inclined elements react as truss web elements which would bear compression or tension stresses. This axial reaction results in less moments and therefore smaller sizes in beam and column sections with respect to members in similar moment resisting frame. Present analytical seismic study deals with optimum location of steel bracing to the RC structure with unsymmetrical building plan of G+30 stories in Zone 5 following IS 1893(part-1):2002 and IS 13920:1993 by nonlinear dynamic analysis. In this paper two separate Unsymmetrical RCC framed buildings one braced and another general (unbraced) subjected to lateral loads are analyzed. Seismic analysis is carried out using software SAP2000 V19 the building is analyzed for different load combinations as per IS 1893:2002. The comparison is done between the braced and unbraced building on the basis of base reactions, joint reactions, and section cut forces. It was observed that seismic performance of the braced building is improved as compared to general (unbraced) building.
