装配式零初始索力摩擦耗能复位支撑受力机理分析
发布时间：2019-04-25 16:35
【摘要】：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.
[Abstract]:In order to solve the problem of excessive residual deformation and prestress loss of the reset cable body after a large earthquake, an assembled zero initial cable friction energy dissipation reset brace with energy dissipation and reset function is proposed. The working mechanism of the brace and the restoring force model are deduced theoretically. The mechanical properties of the brace are simulated and analyzed by ABAQUS finite element software, and the results obtained from the theoretical derivation, finite element simulation and experimental analysis are compared. The results show that the hysteretic curves obtained by finite element simulation and test analysis are in good agreement with the theoretical derivation. There is no stiffness degradation phenomenon of the bracing during loading, the internal force of the cable body changes linearly, and there is no loss of internal force. It is shown that the prestress loss of the cable body can be effectively avoided by adopting two groups of alternating force construction of the cable body with the initial cable force of 0 KN. The supporting hysteretic curve is full and the energy dissipation law is stable, which indicates that the brass-groove steel friction plate damper can provide stable energy dissipation capacity. When the brace is unloaded to the displacement zero point, the residual loads obtained by theoretical derivation, experimental analysis and finite element simulation are 0, 0.12,0 k / N, respectively, indicating that the brace has good reposition ability.
【作者单位】： 北京工业大学建筑工程学院;北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心;
【基金】：国家自然科学基金专项基金资助项目(51278009) 北京市自然科学基金重点资助项目(8131002)
【分类号】：TU352.11
[Abstract]:In order to solve the problem of excessive residual deformation and prestress loss of the reset cable body after a large earthquake, an assembled zero initial cable friction energy dissipation reset brace with energy dissipation and reset function is proposed. The working mechanism of the brace and the restoring force model are deduced theoretically. The mechanical properties of the brace are simulated and analyzed by ABAQUS finite element software, and the results obtained from the theoretical derivation, finite element simulation and experimental analysis are compared. The results show that the hysteretic curves obtained by finite element simulation and test analysis are in good agreement with the theoretical derivation. There is no stiffness degradation phenomenon of the bracing during loading, the internal force of the cable body changes linearly, and there is no loss of internal force. It is shown that the prestress loss of the cable body can be effectively avoided by adopting two groups of alternating force construction of the cable body with the initial cable force of 0 KN. The supporting hysteretic curve is full and the energy dissipation law is stable, which indicates that the brass-groove steel friction plate damper can provide stable energy dissipation capacity. When the brace is unloaded to the displacement zero point, the residual loads obtained by theoretical derivation, experimental analysis and finite element simulation are 0, 0.12,0 k / N, respectively, indicating that the brace has good reposition ability.
【作者单位】： 北京工业大学建筑工程学院;北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心;
【基金】：国家自然科学基金专项基金资助项目(51278009) 北京市自然科学基金重点资助项目(8131002)
【分类号】：TU352.11
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