Abstract: On the basis of the Kanai-Tajimi model and Clough-Penzien model of stationary ground motion processes, two types of generalized evolutionary spectral models of fully non-stationary ground motion acceleration process are established, respectively. According to the Code for seismic design of hydraulic structures (DL 5073—2000), the parameter values of generalized evolutionary spectral models are identified. Applying the spectral representation and random function method, the representative samples ensemble of fully non-stationary ground motion process for the two generalized evolutionary spectral models are generated, and the comparative analysis of the second-order numerical statistics is carried out. Moreover, through comparing the average response spectrum of representative samples ensemble and response spectrum calculated by the code, it is found that the generalized evolutionary spectral models of Kanai-Tajimi spectrum is more applicable to seismic design of hydraulic structure. Finally, through combining Kanai-Tajimi generalized evolutionary spectral model with probability density evolution method, the random seismic response analysis and reliability evaluation of an aqueduct structure is investigated.

Key words: fully non-stationary ground motion, hydraulic seismic resistance, probability model, aqueduct, probability density evolution