非一致激励条件下非线性工程场地地震动相干函数研究

将土非线性分析的等效线性化方法与随机工程波动散射问题的求解方法相结合，建立了开放系统中非一致激励条件下考虑岩土介质非线性的工程场地地震动随机场数值模拟方法并研究了介质非线性对场地地震动相干性的影响。分析结果表明：与不考虑非线性相比，在地震过程中，场地土介质的非线性改变了复杂场地的局部特性从而导致场地地震动空间相干性的变化，因此有必要在场地地震动相干函数的分析中考虑场地介质非线性特性对地震动相干性的影响。

Numerical analysis of nonlinear ground motion coherency function of sites under non-consistent excitations

In this article, by incorporating equivalent linearization method into stochastic wave analysis method of complex sites under non-consistent excitations, methods to evaluate the seismic response of nonlinear engineering site are developed and the effect of soil nonlearity on the spatial incoherence of ground motion is studied. Comparing non-linear ground motion and linear ground motion, the soil nonlinearity changes the structure of power spectra of the studied engineering site, this leads to the variation of spectral ratio at observation points and eventually changes the spatial incoherence of the site. The nonlinearity of the engineering site should be considered in coherency function research.