| In order to improve the overall stability of the traditional support,a support that can produce a yielding phenomenon under tension and compression and effectively suppress the buckling phenomenon of the support,namely Buckling-Restrained Brace(BRB),can be proposed.Effectively absorbs and dissipates the energy input from the seismic and reduces the seismic response of the structure.The widely used BRB is composed of a core material of a low yield material and a peripheral restraint unit filled with concrete.However,such a buckling-resistant support member has a complicated construction process,a large self-weight,and is disadvantageous for use in a large-span structure.Therefore,this paper mainly studies an all-steel square round buckling-restrained brace member,which is composed of a core-stressed inner tube and a constrained outer tube,which greatly improves the disadvantages of the existing buckling-restrained brace members.Firstly,the working principle and composition of buckling-restrained brace are carried out,and the buckling-restrained brace stiffness,bearing capacity and overall stability are theoretically analyzed.The frame structure response spectrum method,time history analysis method and Pushover basicity of buckling-restrained brace are introduced.theory.Using ABAQUS finite element software,numerical simulation was carried out with the test of the round buckling-restrained brace members of Jay Shen et al.,and the simulation results were compared with the test results.The results have some errors,but they can still reflect the whole.The hysteretic energy dissipation performance and regularity of the circular buckling support prove that it is feasible to use the finite element numerical analysis method for the buckling support members.Then the numerical simulation of the force-bearing process of the square-shaped buckling-restrained brace with different clearances is carried out,and the different seismic performance indexes such as hysteresis curve,skeleton curve,stiffness degradation and so on are analyzed.It is found that the size of the gap between the two tubes is a key factor affecting the overall stability of the member,and can affect the hysteretic behavior of the square-shaped buckling-restrained brace member by affecting the friction between the two tubes.Combined with China's seismic design codes,the frame structure fortification target,support arrangement and design flow are discussed.Based on SAP2000 finite element analysis software,the 6-layer and 12-layer pure frame structure and the traditional support frame structure viscous damper frame structure are respectively The reaction spectrum analysis,time history analysis and Pushover analysis of the all-steel square circular buckling-resistant support frame structure were carried out to study the interlayer displacement angle,the underlying shear force and the energy distribution of the frame structure.By comparing the influence of the traditional support and the square-shaped buckling-restrained brace on the seismic performance of the structure,it is found that the square-shaped buckling-restrained brace can better exert the energy-absorbing and shock-absorbing performance of the support and achieve the purpose of protecting the main frame. |
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