位移放大型自复位防屈曲支撑滞回性能分析与数值模拟

Hysteretic Behavior Analysis and Numerical Simulation of Displacement Amplified Self-centering Buckling-restrained Brace

提出一种位移放大型自复位防屈曲支撑,通过Abaqus有限元软件建立数值模型,研究支撑滞回性能、自复位特性以及耗能能力。结果表明:该位移放大型自复位防屈曲支撑具有较好的滞回性能、耗能能力及自复位特性。该支撑的承载力受自复位系统刚度影响较大,耗能能力受预拉力影响较小,当预拉力水平较低时,提高预拉力可以大幅提高支撑的复位性能。

This study proposed a novel Displacement Amplified Self-centering Buckling-restrained Brace(DASCB).A series of numerical models of DASCBs were developed to study its hysteretic behavior,self-centering and energy dissipation capabilities based on the finite element software Abaqus.Results showed that the DASCBs exhibited good hysteretic behaviors,energy dissipation and self-centering capacities.Numerical results showed the stiffness of self-centering system had great effect on the bearing capacity of DASCBs,and yet the energy dissipation was affected less by the prestress level of steel strand.Increasing the prestress strength of steel strand can greatly improve the self-centering performance,when the pre-tension level of strand is low.