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为解决结构大震后残余变形过大以及复位索体预应力损失的问题,提出了一种具有耗能及复位功能的装配式零初始索力摩擦耗能复位支撑.对该支撑的工作机理、恢复力模型进行了理论推导,应用ABAQUS有限元软件对其力学性能进行了模拟分析,并将理论推导、有限元模拟与试验分析得到的结果进行了对比.结果表明:利用理论推导、有限元模拟及试验分析得到的滞回曲线吻合较好,加载过程中该支撑无刚度退化现象,索体内力呈线性变化,无内力损失,说明该支撑采用2组初始索力为0 k N的索体交替受力构造,可以有效地避免索体的预应力损失问题;该支撑滞回曲线饱满,耗能规律稳定,表明黄铜-槽孔钢摩擦板耗能器可以提供稳定的耗能能力;该支撑卸载至位移零点时,理论推导、试验分析及有限元模拟得到的残余荷载分别为0,-0.12,0 k N,说明该支撑具有良好的复位能力.
In order to solve the problem of excessive residual deformation and the loss of prestressing force of the cable body after the earthquake, an assembly-type zero initial friction force energy recovery support with energy dissipation and resetting function was proposed. The working mechanism, The results of theoretical analysis, finite element simulation and experimental analysis are compared.The results show that: using theoretical derivation, finite element simulation And the experimental results show that the hysteretic curve is in good agreement. During the loading process, the support has no stiffness degradation, and the internal force of the cable body changes linearly with no loss of internal force. The results show that the two groups of cables with initial cable force of 0 kN alternate The force structure can effectively avoid the loss of prestressing force of the cable body. The support hysteresis curve is full and the energy consumption law is stable, which shows that the brass-slot steel friction plate energy dissipator can provide stable energy dissipation capacity. When unloaded to the displacement zero point, the theoretical derivation, experimental analysis and finite element simulation of the residual load were 0, -0.12,0 k N, indicating that the support has a good reset capability.