Seismic Behavior Of RC Building Frame With Steel Bracing System Using Various Arrangements

Steel bracing system is one of the effective measures for resisting the horizontal forces like seismic and wind forces in reinforced concrete multistory buildings. Bracing member’s are subjected to tension and compression; subsequently they are provided to take these forces. Steel bracing framework expands the stiffness and strength of the RC multistory building and reduces their deformation. Present study is based on seismic analysis of RC building frames with V type bracing and inverted V type bracing. Seismic coefficient method (linear static analysis) has been conducted to evaluate the effect of different arrangements of bracing members in the building frame and influence of the different steel cross-section. For this study, a fifteen story building assumed to be situated at seismic zone IV as per the seismic zone map of India. Three steel profiles ISA, ISMC and ISMB were utilized as bracing members by considering same cross-sectional area. For modeling and analysis work computer software StaadproV8i was used. Result of this study revealed that inverted V bracing reduces the bending moment, shear force, storey drift and node displacement significantly. It was also found that the various arrangements of bracing systems has great influence on seismic performance of the building frame and double angle section give better result as compared to ISMB and ISMC section.