基于建筑抗震规范的随机地震动时程生成

Generation of Random Ground Motion Time History Based on Seismic Code for Buildings

基于建筑抗震规范反应谱,利用反应谱与功率谱之间的近似转换关系,将规范反应谱转换为功率谱,并结合强度调制函数来构造演变功率谱.应用非平稳随机过程模拟的谱表示—随机函数方法,即可生成随机地震动的代表性时程集合.为了使生成的随机地震动代表性时程能够应用于工程结构抗震设计,需要对功率谱进行迭代修正,直到代表性时程的平均反应谱与规范反应谱拟合一致.结果表明,该方法简便有效,具有足够精度,可在实际工程中推广使用.

Based on response spectra of seismic code or buildings, code response spectra are transformed into power spectra by using the approximate transforming relationship- and then evolutionary power spectrum combined strength modulating function is generated. The representative time history set of random ground motions is obtained by using the spectral representation-random function method. In order to make that the generated representative time histories of random ground motions can be applied to seismic design for engi- neering structure, power spectra need to be revised interactively until the average response spectra of repre- sentative time histories and code response spectra can fit well. The results show that the method is simple and effective with sufficient precision- it can be popularized in practical engineering.