A Study on Seismic Behaviour of Braced frame

The study of braced steel frame response is widely studied in many branches of Structural engineering.Many researchers have been deeply studying these structures, over the years, mainly for their greater capacity of carrying external loads.Every Special moment resisting frames undergo lateral displacement because they are susceptible to large lateral loading.The problems associated with this are theP-∆ effect and the ductile and brittle failure at beamsand columns connections .As a consequence, engineers have increasingly turned to braced steel frames as a economical means for earthquake resistant loads.The present study consist of two models.Model 1 is a Steel Moment Resisting Frame (SMRFs) with concentric bracing as per IS 800-2007.Cross bracing, diagonal bracing and an unbraced frame is considered for study.Model 2 consist of two Steel Moment Resisting Frame with similar V type bracing and Inverted V ( hevron bracing ) configuration, but with varying height.Performance of each frame is studied through Equivalent static analysis, Response Spectrum analysis, and linear Time History analysis.In structural engineering, a braced frame is a structural system designed to resist wind and earthquake forces.Members in a braced frame are not allowed to sway laterally (which can be done using shear wall or a diagonal steel sections, similar to a truss Steel moment resisting frames without bracing, inelastic response failure generally occurs at beam and column connections.They resist lateral forces by flexure and shear in beams and columns i.e. by frame action.Under severe earthquake loading ductile fracture at beams and columns `connections are common.Bucklingrestrained brace (BRB) is a structural brace in a building, designed to allow the building to withstand cyclical lateral loadings, typically earthquake-induced loading.It consists of a slender steel core, a concrete casing designed to continuously support the core and prevent buckling under axial compression, and an interface region that prevents undesired interactions between the two braced frames.