Research On Design Of Local Replacement Shear Wall For Bearing Type Buckling Restrained Brace

The main functions of the buckling restrained braces applied to the construction engineering structure include providing additional damping and providing lateral stiffness to a certain extent.The former corresponds to the energy-consuming buckling restrained brace,and has been widely used in many fields such as construction engineering construction,reconstruction and reinforcement.Correspondingly,the high-strength core material and the load-bearing BRB with high bearing capacity are relatively less used.Although the buckling restrained brace is reduced in energy consumption,it has high bearing capacity and equivalent load.Relatively small construction cross-sectional size characteristics under conditions,under certain conditions,still have significant application advantages.As a typical example,a load-bearing buckling restrained brace partially replaces the structural shear wall,using its high bearing capacity properties to provide a substantially equivalent lateral stiffness contribution to the alternative shear wall,while having a smaller cross-sectional dimension than conventional steel supports.And relatively simple node connection style,can significantly improve the building facade effect,and is fully applicable to the reinforced concrete frame-shear wall structure system.Based on the actual engineering case of the two framework-shear wall structure system of China Merchants Bank Information Building and Yinchuan Jianfa Project,this paper studies the feasibility of engineering application of load-bearing buckling restrained braces partial replacement shear wall.Combined with the elastic model calculation method,the elastoplastic model calculation method and the actual member bearing capacity test,the bearing properties of the load-bearing buckling-resistant buckling under various practical conditions,the contribution of the lateral stiffness,the damage development trend and the ultimate bearing specific research on the realization of force.The elastic analysis is studied from two aspects: frequently earthquake analysis and performance design analysis.Under the action of frequently earthquakes,the structural index changes,the contribution of the anti-lateral force stiffness and the bearing capacity of the anti-buckling support after the buckling support is replaced by the shear wall are studied.In the performance-based design analysis,for the seismic intensity and the rare earthquake intensity assumed by the elastic calculation,three performance targets of medium earthquake unyielding,medium earthquake elasticity and large earthquake are not yielded,and the anti-buckling is studied under three performance targets.The bearing capacity of the support achieves a state and anti-side stiffness contribution and confirms its equivalent performance level with the replaced shear wall.The elastoplastic analysis is carried out from three aspects: static elastoplastic pushover analysis,dynamic elastoplastic time history analysis and key node finite element elastoplastic analysis under rare earthquake intensity.In the static elastoplastic pushover analysis,combined with the grading loading properties of horizontal loads,the damage analysis of the main structure and buckling-proof support and the retention ability of the bearing capacitybuckling support high bearing capacity are studied.In the dynamic elastoplastic time history analysis,the time history analysis of three rare earthquake waves is used to analyze the structural dynamic index,the structural damage development,the force state of buckling buckling support,and the cooperative working mode of buckling brace and frame,and then confirm the prevention.The bearing capacity of the buckling support maintains the properties and the effectiveness of the lateral stiffness contribution.In the finite element analysis of key nodes,the reliability of the buckling buckling support and the joint structure of the reinforced concrete main structure is analyzed and analyzed by finite element software simulation.It is verified that the cooperative working mechanism with the reinforced concrete main structure can be effectively guaranteed.The component test verified the effective guarantee of its high bearing capacity attribute through the low cycle repeated quasi-static loading test of three typical scale test pieces.