地震动随机场投影展开法

本文发展了随机场投影展开方法，对地震动随机场进行变界近似解析展开。地震动采用自功率谱与具有高斯指数衰减的相关函数模型。本文方法只须求解一次随机场特征值问题，具有简单和展开误差小的特点，非常适应结构多点随机输入分析。

Projection expansion of seismic random fields

projection method of random field is developed in the present study for expansion of seismic random fields. The seismic ground is specified stochastically in terms of a local power spectral density function and an orthotropic inherence function which decays exponentially with the square of the excitation frequency and the separation distance. The spectral expansion of the seismic random field is performed only once. The numerical results elucidate the effects of the present approach. This approach is well suited to analyze the structural stochastic responses.