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一.引言 在通常的地震反应分析中,都假定结构地基底部在地震作用期间的任一时刻,都具有相同的地震加速度值和相同的作用方向。显然,这种一致地震输入的假定对象大坝这类大体积长基础建筑物是不合乎实际的。事实上,由于地震波在地基中的传播,更由于传播过程中波的折射、反射以及坝与基础的相互作用,结构物基础底部的地震输入是不可能完全相同的,在河谷两岸同时实测到的地震记录也证实了这点。
I. INTRODUCTION In the conventional seismic response analysis, it is assumed that the bottom of the structural foundation has the same value of seismic acceleration and the same direction of action at any time during earthquake action. Obviously, it is not realistic to assume that this type of large-volume, long-lasting foundation dam, such as a hypothetical object of consistent earthquake input, In fact, the seismic input at the bottom of the structure foundation can not be exactly the same due to the propagation of seismic waves in the ground and more because of the wave refraction, reflection and dam-foundation interaction in the propagation process. Simultaneously measured at both sides of the valley Seismological records also confirm this.