【摘要】 针对谐波叠加法模拟地震动时程时含有较多人为因素干扰以及模拟的时程不具有频率非平稳特性的问题,提出了一种基于静态离散小波变换的地震动时程调整方法.利用静态离散小波变换,将地震动时程历史记录分解到不同的频带上,通过不同频带的目标反应谱与地震动历史时程计算的反应谱在该频带上的对比,对各尺度的小波系数进行迭代修正,重构得到新的地震动时程记录.通过编制程序并进行算例验证,结果表明:该方法正确可行,调整得到的地震动时程既与给定目标谱一致,又较好地保留了原有特征.更多还原

【Abstract】 In order to solve the problem that there exsits more interference of human factors in simulating the ground motion time-history with harmony superposition method and the simulated ground motion time-history has no non-stationary frequency characteristics,a ground motion time-history modulation method based on stationary discrete wavelet transform was proposed.With the stationary discrete wavelet transform,the history record of ground motion time-history was decomposed onto different frequency bands.Through comparing the target response spectrum for different frequency bands with the calculated ground motion time-history response spectrum on the corresponding frequency band,the iteration and modification of wavelet coefficients with various scales were performed,and then a new ground motion time-history record was reconstructed.Through compiling the program and performing the example verification,it is found that the poposed method is correct and feasible.The modulated ground motion time-history can not only be consistent with the target response spectrum,but also maintain its original characteristics well.更多还原