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本文采用动力非线性有限元法研究了钢筋混凝土面板堆石坝的地震反应,并用滑移面上的静、动应力求得坝坡抗震稳定安全系数时程曲线。根据坝址的地质构造,将实测的坝址附近震中地震加速度调整为设计加速度过程线。计算时,采用分段迭代的方法,不仅考虑了堆石的动力非线性性质,而且也考虑了混凝土动力非线性性质以及自振频率在振动过程中的变化,比较全面地反应了材料和结构的动力特性。
In this paper, the nonlinear dynamic finite element method is used to study the seismic response of the reinforced concrete face rockfill dam, and the time-history curve of the safety stability of the dam slope is obtained by the static and dynamic stresses on the slip surface. According to the geological structure of the dam site, the acceleration of the epicenter earthquake near the measured dam site is adjusted to the design acceleration process line. In the calculation, a piecewise iterative method is used to consider not only the dynamic nonlinear properties of the rockfill, but also the nonlinearity of the concrete dynamics and the variation of the natural vibration frequency in the vibration process, which fully reflects the material and structure. Dynamic characteristics.