多段屈服防屈曲耗能支撑的性能影响因素研究

Study on the factors affecting the performance of multi-stage yield buckling restrained energydissipation braces

为研究多段屈服BRB在循环荷载作用下不同因素对其力学性能影响的程度大小。在确定削弱比例条件下,通过数值模拟改变削弱段数量、不同削弱段间距以及初始缺陷等三种情况,分析多段屈服BRB滞回曲线、耗能能力、拉压不平衡系数、等效黏滞阻尼比等的变化规律。计算结果表明:削弱段数量为两段时,滞回曲线饱满,耗能能力稳定,随着削弱段数量增加,耗能能力减弱;当削弱段间距等于削弱段至内芯端部距离时,滞回曲线饱满、耗能能力最佳;当初始缺陷控制比例在2%内时,滞回曲线差别不大,说明初始缺陷较小时对支撑性能影响不明显。

This paper studies the influence of different factors on the mechanical properties of multi-stage yield BRB under cyclic loading.Under the condition that the weakening ratio is determined,the change rules of multi-stage yield BRB hysteretic curve,energy dissipation capacity,tension compression imbalance coefficient and equivalent viscous damping ratio were analyzed by numerical simulation under the three conditions of changing the number of weakening segments,different weakening segment spacing and initial defects.The calculation results show that when the number of weakening segments is two,the hysteretic curve is full and the energy consumption capacity is stable.With the increase of the number of weakening segments,the energy consumption capacity decreases.When the distance between the weakening segments is equal to the distance between the weakening segments and the end of the core,the hysteretic curve is full and the energy dissipation capacity is the best;When the control ratio of the initial defect is within 2%,the difference of the hysteresis curve is small,which indicates that the influence of the initial defect on the support performance is not obvious.