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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。
In order to reflect the characteristics of seismic response acceleration of high embankment dam, a finite element method which is applied to the seismic stability analysis of high embankment dam is proposed based on the modal superposition method. Firstly, the dam mode is analyzed and the model is obtained based on the modal superposition method Equivalent quasi-static seismic load on the node of the unit, and then calculate the safety coefficient of seismic stability of the dam by using the strength reduction elasto-plastic finite element method. Through the seismic stability analysis of a typical high-earth-rock dam, the feasibility and rationality of this method are verified. The distribution of the seismic inertia force of the dam has increased as the “whiplash effect” and the dam material Characteristics affect the seismic acceleration distribution.