拱坝随机地震行波效应分析

将随机振动的虚拟激励法与拱坝地基动力相互作用FE-BE-IBE时域模型结合,发展了一个可以考虑随机地震动行波效应的拱坝随机动力响应计算模型,并用Monte-Carlo法对模型进行了验证.不同行波波速的计算结果表明,行波效应可以影响拱坝的动力响应,幅度在10%~20%,较小的行波波速在坝体边界产生应力集中现象,表明行波效应对拱坝动力响应具有显著影响.

Analysis of traveling wave effect of random earthquakes on arch dams

A random vibration analysis model of arch dam-foundation interaction was developed by combination of the pseudo-excitation algorithm with FE-BE-IBE time domain procedure. The effects of traveling waves on random seismic responses of arch dams can be conveniently included. To verify the accuracy of the presented model, the Monte-Carlo method was employed to calculate the seismic responses of a concrete arch dam model. The result shows that the traveling wave affects the dynamic response of arch dams with an amplitude of 10%-20% , and that the lower velocity of traveling wave results in the concentration of pseudo static stresses on the boundary of arch dams. Therefore, the traveling wave effect is of great influences on the dynamic response of arch dams.