学术论文

      矩形脉冲激励下自复位墙的摇摆响应

      Rocking response of self-centering wall under rectangular pulse

      摘要:
      为了提高自复位墙在强震作用下的抗震性能,对其在矩形脉冲激励下的动力摇摆响应进行了研究.在假定墙体刚性和墙体-地基无滑移的基础上,建立了自复位墙的摇摆动力分析方程.引入小倾角假定对动力方程进行适当简化,并考虑墙体在摇摆过程中与基础碰撞的能量损失,通过理论推导得到了自复位墙摇摆响应的解析解.针对一个自复位墙算例,采用该方法进行动力摇摆分析,并与增量数值求解的结果进行对比验证.此外,基于动力方程中的恢复系数,给出了自复位墙等效黏滞阻尼的计算公式,研究了不同墙底基础碰撞界面材料特性对自复位墙摇摆响应的影响.结果表明:解析解能够反映墙体在矩形脉冲激励下的动力摇摆响应;自复位墙的等效黏滞阻尼随着恢复系数的增加而降低,二者基本成线性关系;墙体在摇摆过程中等效黏滞阻尼随着周期的增加而增大.
      Abstract:
      To improve the seismic performance of self-centering wall under strong ground motion, the rocking response of the self-centering wall under rectangular pulse is investigated.Based on the no-slipping and rigid base assumptions, dynamic equations of a self-centering wall under rectangular pulse are derived.The exact analytical solutions considering the energy dissipation in the rocking process are derived from the simplified dynamic equations with minor rocking angle assumption.A specific self-centering model is analyzed with the analytical solutions, and the results of analytical solutions are verified by the numerical solutions.Additionally, on basis of the restitution factor in equations, the method for calculating the equivalent viscous damping ratio for the self-centering wall is given as well.The influence of different materials between wall base and foundation on the rocking response of a self-centering wall is analyzed.The results show that the analytical solution can reflect the rocking behavior under rectangular pulse.The equivalent viscous damping ratio decreases with the increase of the restitution factor, and there is a linear correlation between them.With the increase of the rocking period, the equivalent viscous damping ratio increases in the rocking process.
      作者: 周臻 朱冬平 谢钦
      Author: Zhou Zhen Zhu Dongping Xie Qin
      作者单位: 东南大学混凝土及预应力混凝土结构教育部重点实验室,南京,210096
      年,卷(期): 2017, 47(4)
      分类号: TU352.1
      在线出版日期: 2017年8月15日
      基金项目: 国家自然科学基金资助项目,江苏省"青蓝工程"资助项目、江苏省六大人才高峰资助项目,江苏省普通高校研究生实践创新计划资助项目