Seismic Analysis of RC Building Frames with Different Types of Steel Bracing using Different Steel Section

Steel bracing system is one of the very efficient lateral load resisting system for multistory buildings. Steel bracings are generally used in steel structures to resist lateral forces, this concept is extended to RC buildings. Bracing members are subjected to compression and tension, hence they are provided to take these forces. Steel bracing system increase the stiffness and stability of the RC multistory building and decrease there deformation. Present study based on seismic analysis of RC building frames with different types of steel bracings provided externally and internally in the building using three different steel section for bracing members. For this study, a fifteen storey building assumed to be located at seismic zone IV as per IS: 1893-2002. Four types of bracings (X type, V type, inverted V type and diagonal type) are provided on two different location in the building and for these bracing members, three steel section ISA, ISMC and ISMB are used by considering same cross-sectional area. StaadproV8i computer software is used for structural modeling and analysis work. Results are in terms of following seismic parameters-bending moment, shear force, storey displacement and storey drift, which are compared with bare frame model. Results shows that steel bracings increase the stiffness and stability of the RC building as compared to bare frame model. From which X-type and inverted V type bracing shows better result than other type of bracing system. Location of these bracing members in the structure also effects the behavior of the RC building frame under seismic forces.