装配式自复位屈曲约束支撑滞回性能

Hysteretic Behavior of Assembled Self-Centering Buckling-Restrained Brace

摘要:

提出了一种装配式自复位屈曲约束支撑（ASC-BRB），对其基本构造、受力机理和滞回性能进行了理论分析，建立了ASC-BRB的有限元模型，进一步分析了ASC-BRB的滞回性能，并研究了关键构造参数对其滞回性能的影响规律。结果表明，理论恢复力模型能够有效描述ASC-BRB的滞回特征，理论结果与有限元结果整体吻合较好。碟簧组合压并后，支撑刚度显著增大，能够防止强震下结构层间变形的快速增加，减小层间变形集中效应。进行ASC-BRB设计时，各关键构造参数需合理匹配，使得ASC-BRB具有良好的变形能力、耗能能力和复位能力，并可以有效减小结构在强震下的层间变形集中效应。

Abstract:

An assembled self-centering buckling-restrained brace （ASC-RBB） was proposed， and its working mechanism and hysteretic behavior were theoretically analyzed. Furthermore， finite element models were established to investigate the hysteretic behavior of ASC-BRB， and to study the influence of key structural parameters on its hysteretic performance. The results show that the theoretically-derived restoring force model can effectively describe the hysteretic characteristics of ASC-BRB， and the theoretical results are in good agreement with the finite element results. After the combined disc springs being fully compressed， the stiffness of ASC-BRB increases significantly， which can prevent the rapid increment of the stratified deformation and reduce the deformation concentration of structures under strong earthquakes. When designing ASC-BRB， the key structural parameters need to be appropriately selected so that the brace can exhibit an appreciable deformation capacity， energy dissipation， and self-centering ability， and effectively reduce the deformation concentration of structures under strong earthquakes.