二维复杂工程场址设计地震动的修正分析方法

地震安全性评价中工程场地设计地震动通常采用一维等效线性化水平成层的分析模型，但对一些较复杂的场地条件，如蓄能电站所处场地，仅考虑一维场地是不够的，而需考虑二维场地的影响。常规采用的二维有限元很难考虑诸多因素，为工程设计带来了很大的困难。提出了可考虑二维复杂工程场地影响的设计地震动的修正分析方法和简化方法，该方法还可考虑非线性对场地的影响及吸能边界等因素，而且计算简单，并易于同常用的一维等效线性化方法结合。实例分析结果合理，对工程场地地震动的确定具有重要意义。

The modified method for determining design ground motions of 2D complex engineering site

The one dimensional as equivalent linear layer model is usually used for evaluating the earthquake safety of sites. This is not sufficient for some complex site condition such as that of stireage energy power station. The am- plified effect of two dimension site conditions should be considered. However, it is difficult for engineering design to considering so many factors in 2D - FEM models. A new modified method and a simplified method are presented in the paper to take account of many factors such as 2D site condition, computing cost, nonlinear soil and absorbing boundary condition etc. The new methods are advanced on simplifying computation, easily combined with the one dimension equivalent linear layer, and gained the reasonable results. Some significant suggestions are provided to the design parameters of ground motion of 2D engineering sites.