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利用编制的场地地震反应并行计算程序PSAP,分别选取基岩长周期地震波和普通地震波作为输入,采用等效线性化方法,对某河谷场地进行了不同类型地震波作用下的三维有限元并行计算,分析了三维河谷场地的长周期地震反应特点,探讨了不同视波速情形下河谷场地的行波效应。结果表明,行波作用下局部场地产生明显的竖向地震反应,长周期地震波的水平向加速度反应放大系数明显大于普通地震波的结果,利用PC集群并行求解技术可以有效提高大型有限元分析的计算效率。
Using the program PSAP, a long-period basement seismic wave and a normal seismic wave are selected as input respectively. The equivalent linearization method is used to calculate and analyze three-dimensional finite element of a river valley site under different types of seismic waves. The characteristics of the long-period seismic response in the 3D river valley site are discussed, and the traveling wave effects in the valley site under different apparent velocities are discussed. The results show that the obvious vertical seismic response occurs in the local field under the action of traveling wave, the horizontal acceleration response amplification coefficient of the long-period seismic wave is obviously larger than that of the ordinary seismic wave, and the PC cluster parallel solution technique can effectively improve the computational efficiency of the large-scale finite element analysis .