中文摘要：

在平稳地震动过程的功率谱密度函数基础上,发展了一类时-频全非平稳地震动过程的广义演变谱模型。广义演变谱模型可以全面地反映地震动的时域特性和频域特性,如强度非平稳性、持续时间、地震动峰值加速度以及频率非平稳性、场地特性和反应谱。结合我国现行的水工建筑物抗震设计规范,确立了广义演变谱模型的参数取值。同时,应用非平稳随机过程模拟的谱表示-随机函数方法,建立了4类场地条件下的水工建筑物抗震设计所用地震动的代表性时程。最后,通过代表性时程的二阶统计值与目标值的比较,以及代表性时程的平均反应谱与规范反应谱的拟合误差,验证了广义演变谱模型的合理性和优越性。

英文摘要：

Based on the power spectral density function of stationary ground motion, a new model of gener- alized evolution spectrum of fully non-stationary ground motion process is developed. The model of general- ized evolutionary spectrum can be fully represented the time domain and frequency domain characteristics of seismic ground motion process, such as the intensity modulating non-stationary, duration, peak ground acceleration, frequency modulating non-stationary, site characteristics and response spectrum. Combined with Chinese specifications for seismic design of hydraulic structures, the parameters of generalized evolu- tionary spectrum model are established. Applying the spectral representation and random function approach to simulate non-stationary ground motion process with the generalized evolutionary spectrum, the representa- tive samples of different site categories for seismic design of hydraulic structures are generated. Finally, compared with the second-order statistics of representative samples and the targets, and the average re- sponse spectrum and the specification response spectrum, the effectiveness and superiority of the proposed model can be demonstrated.