高拱坝体系整体抗震安全评价方法研究

采用非线性地震波动反应分析方法，将坝体、地基、库水的强震反应本质上作为满足体系中接触面边界约束条件的波传播问题，在时域内以显式有限元方法求解。在不同概率水平的地震波作用下进行高拱坝与地基体系的有限元时程分析，并建议了以坝体位移反应发生突变为依据的拱坝体系整体失稳判断准则，从而建立了进行高拱坝体系整体抗震安全评价的方法，并以小湾拱坝为算例，对其抗震安全度作出初步评价。

The method of holistic earthquake safety evaluation of a high arch dam system

In the paper the nonlinear seismic response analysis method is adopted, the seismic response of the damfoundation -reservoir system is considered as a problem of wave propagation with contact surface restriction conditions, and it is solved by explicit finite element method in time domain. The seismic response analysis of a high arch dam -foundation -reservoir system under the action of seismic waves with different exceedance probability is finished, and the displacement abruptly increasing is suggested as the criterion to estimate the seismic safety of the arch dam system. Consequently , the method of holistic seismic safety evaluation of the high arch dam system is built, and the earthquake resistance of Xiaowan Arch Dam is evaluated as an example.