考虑时程竖向加速度的Newmark滑块位移法

利用改进的Newmark滑块位移法,采用时程竖向加速度计算屈服角加速度,运用拟静力极限平衡分析和地震动力反应分析计算土工结构地震永久变形。算例计算结果表明,屈服角加速度计算采用时程竖向加速度得到的滑动位移位于竖向加速度假定恒定向上或向下之间。适当改变筑坝土石料的动力刚度,研究了滑动体位移关于动力刚度的敏感性,为土工建筑物的抗震设计提供依据。

Effects of vertical acceleration time-histories on Newmark sliding block analyses

A simplified procedure for evaluating aseismic stability of slope subjected to earthquake shaking,in which the effect of time-history vertical acceleration on the yielding angular acceleration of sliding block is taken into account is presented.The fundamental feature of this procedure is the vertical acceleration time-histories.The numerical computations are performed by using the proposed method.It is shown that the computed sliding displacement for a given embankment,in which time-history vertical acceleration is properly considered,is more rational compared with the conventional computational results.Finally,a dynamic parameter analysis is performed and shown to successfully offer the rational references and scopes of evaluation for the aseismic design of embankment.