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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.
In order to improve the seismic performance of self-resetting wall under strong earthquake, the dynamic swaying response under rectangular pulse excitation is studied.On the basis of assuming the rigidity of the wall and the no-slip of the foundation and the foundation, a self-resetting The analysis of the rocking dynamics of the wall is introduced.A small inclinometer is introduced to simplify the dynamic equation and to consider the energy loss of the wall colliding with the foundation during the rocking process.Analytical solution of the rocking response of the self- The example of resetting the wall is used to analyze the power swing and verify the results with the incremental numerical solution.Furthermore, based on the recovery coefficient in the dynamic equation, the equivalent viscous damping formula of the self-resetting wall is given, The results show that the analytic solution can reflect the dynamic rocking response of the wall under the rectangular pulse excitation. The equivalent viscous damping of the self-resetting wall increases with the recovery The coefficient is increased and decreased, the two are basically linear relationship; the equivalent viscous damping of the wall increases with the increase of the period.