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

提出了一种装配式自复位屈曲约束支撑(ASCBRB),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ASCBRB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ASCBRB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ASCBRB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。

An assembled self-centering bucklingrestrained 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 ASCBRB,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.