在文《非一致激励条件下工程场地地震动相干雨数的数值模拟——Ⅰ分析原理和方法》中,通过将随机振动的虚拟激励原理与工程波动理论散射问题的求解方法相结合,提出了开放系统中非一致激励条件下工程场地地震动随机场的数值模拟方法。本文将建议方法应用于具有非一致随机激励的复杂工程场地的地震动相干函数分析之中,讨论了受局部场地条件影响的地震动相干函数的若干特征。
In part Ⅰ , based on the pseudo -excitation method and the numerical simulation techniques of wave motions about scattering problem, a stochastic wave analysis method is presented. Using this method, the coherency function of the ground motions under the inconsistent excitation can be obtained . Several numerical examples are given in this paper to show its possible application to estimate the spatial incoherence of earthquake ground motion. The results indicate that the local site conditions have great effects on the seismic ground motion under inconsistent excitations.