采用谐波合成法对随机地震动场的模拟

基于大跨度的空间结构,在进行地震反应分析时,考虑多点多维激励更接近实际情况的特点,分析了大跨度空间结构在地震作用时表现出非常明显的几何非线性特征,这种非线性特征只有通过时域分析才能得以考虑和处理,而在时域分析中,首先要解决的问题就是模拟地震动场。采用谐波合成法(WAWS法)对随机地震动场进行了模拟。由于在算法中引入了快速傅立叶变换,使得计算时间和计算精度明显提高,从而实现了快速有效地模拟地面运动加速度时程的目标。

Simulation on Random Earthquake Motion Field with WAS Method in Use

Mutiple-point and many dimensional motivation for large-span space structure approached to practice in the analysis of earthquake response.So the large-span space structure presented obviously geometric nonlinear distinction under the action of earchquake.This nonlinear distiction can only be considered and disposed by time domain,and the first problem to be settled was the simulation of the random earthquake motion field.The method of WAS was used in simulating the random earthquake motion field.Since the quick Fourier transformation has been made use of,which brought in the increase of calculation precision and calculation time apparently,the goal of simulating at the accelerated speed of earth surface was implemented fast and effectively.