Analysis Of Cross Section Buckling Restrained Brace

Steel structures have the properties of lightweight high-strength and better lateral stiffness which makes braced steel frames plan an excellent role in the seismic area. It is proved that the buckling of conventional braces caused by compression will aggravate the seismic damage in practice. Buckling restrained brace is an improvement of the conventional brace, which is set a constraint casing in the outsides of the conventional braces in order to increase energy dissipation capacity and improve the seismic performance.The composition of the buckling restrained brace with the core of cross section components and the working principle were analyzed, and researches to several factors that affect the performance of buckling restrained braces (the core of the cross-sectional area, width-thickness ratio, clearance, etc.) were carried out in the paper. Load-displacement curves of the buckling restrained braces under different constraint ratios and width-thickness ratios were simulated and analyzed based on ANSYS. The elasto-plastic time history response of pure steel frame structures, ordinary braced frame structures and buckling restrained braces frame structures were conducted with finite element software-SAP2000.The displaces and accelerations of the three kinds of structures above were analyzed under frequent earthquake and rare earthquake. Conclusion with certain reference value is reached.