中文摘要：

通过引入非均匀调制函数模型,实现了对地震动时频非平稳特性起重要作用的时变功率谱的模型化,结合模型参数识别方法,验证了利用所采用非均匀调制函数模型来表征地震动时频非平稳特性的有效性.同时,利用SMART1台阵记录,对非均匀调制函数参数的空间变化特性进行了分析,并探索了利用非均匀调制函数参数化模型实现完全非平稳多点地震动模拟的方法.算例分析表明,该方法不仅避免了传统演变谱法实现过程中对时变功率谱理论模型进行简化所带来的不足,而且可同时考虑空间地震动的相干效应、行波效应并与目标反应谱拟合较好,在实际工程中具有较强的推广应用价值.

英文摘要：

By introducing a non-uniform modulation function,the time-varying power spectrum model which plays an important role in the non-stationary characteristics simulation of ground motion is implemented.Combined with the model parameter identification method,the effectiveness of the modulation function is verified and the non-stationary characteristics of ground motions have also been tested.Using SMART 1 array records,the spatial variation characteristics of the non-uniform modulation function parameters are analyzed and the simulation method of the fully non-stationary spatially variable ground motion based on the non-uniform modulation function parameterized model is explored.Example analysis shows that the method not only avoids the shortcomings caused by the simplified theoretical model of time-varying power spectral during traditional evolution spectrum methods,but also takes the ground motion spatial coherence effects,wave passage effect into account.It can fit the target response spectrum better,which implies the method proposed in this paper has a strong application value in practical engineering.