【摘要】 为反映高土石坝地震反应加速度分布的特点,基于振型叠加方法提出了一种应用于高土石坝抗震稳定分析的有限元方法,首先对大坝进行振型分析,基于振型叠加方法得到作用于单元节点上的等效拟静力地震荷载,再用强度折减弹塑性有限元法计算获得大坝抗震稳定安全系数。通过对典型高心墙土石坝的抗震稳定分析,验证了该方法的可行性与合理性,所确定的坝体地震惯性力分布特征为"鞭梢效应"有所增加,且坝体材料特性影响地震加速度分布。更多还原

【Abstract】 In order to reflect the properties of the seismic acceleration response distribution of the high earth-rock dam,a new finite element method based on mode superposition is proposed.The method can be used to study the seismic stability of the high earth-rock dam.Firstly,modal analysis is carried out on the dam,and the equivalent pseudo-static seismic load applied to the element nodes is gained by using the modal superposition method.And then,the dam seismic stability safety factor is obtained by calculating with strength reduction elastic-plastic finite element method.Based on the seismic stability analysis of the typical high core earth-rock dam,it verifies the feasibility and rationality of the method.The characteristic of the dam earthquake inertia force distribution is "Whip Ending Effect".At the same time,the material properties of the dam have impact on the seismic acceleration distribution.更多还原