平稳地震动过程具分段均布随机频率的谱拟合模型

本文首先针对平稳随机地震动谱拟合问题建立了一个统一的谱拟合模型，在此基础上，提出了一新的具分段均布随机频率的拟合模型，并与几类常用的谱拟合模型进行了比较研究，指出拟合模型的频率特性对拟合功率谱与反应谱具有显著的影响。算例表明，当结构的自振频率与拟合模型的分量频率接近时，计算的响应值明显偏大，对于小阻尼情况，这一现象更为明显。

A new model with segmentally uniformly distributed random frequencies for simulation of stationary random ground motion

A unified model for the simulation of stationary random ground motion was established first. Based on this, a new model with segmentally uniformly distributed random frequencies was proposed and compared with some common spectrum simulation models. It is pointed out that the power spectrum densities and the response spectra are affected by the character of frequencies in the models remarkably. When the natural frequencies of structures are close to the component frequencies in the model, the structural responses due to the simulated earthquake history will be overestimated. It will be more obvious when the structures are with light damping.