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在对结构物进行非线性动力响应分析时,常常需要输入与规范反应谱相拟合的地震动时程。对多阻尼反应谱拟合的时域调整进行了研究。基于单阻尼拟合中广泛应用的时域叠加小波函数方法,改进了模拟算法,考虑了各个阻尼下叠加函数的相互影响,从而实现将该模拟算法推广到多阻尼拟合中。并以某实测地震动为例,分别拟合我国规范反应谱和欧洲规范反应谱,将该地震动调整为以规范反应谱相拟合的地震动,模拟结果表明所提出的多阻尼时域调整方法在多阻尼拟合时可以有效将拟合误差控制在规范要求范围以内,拟合效果较好。
In nonlinear dynamic response analysis of structures, it is often necessary to enter the earthquakes that fit the canonical response spectrum. The time-domain adjustment of multi-damping response spectrum fitting was studied. Based on the time-domain superposition of wavelet function widely used in single-damping fitting, the simulation algorithm is improved and the mutual influence of the superimposed functions under various damping is considered. Thus, the simulation algorithm is generalized to multi-damping fitting. Taking a measured earthquakes as an example, we fit the normative response spectrum and the normative response spectrum of China respectively, and adjust the earthquakes to ground motions fitted by the normalized response spectrum. The simulation results show that the proposed multi-damping time-domain adjustment The method can effectively control the fitting error within the scope of the specification when the multiple damping fitting is performed, and the fitting effect is better.