Study on the Random Model Parameters of Ground Motion Corresponding to the Architectural Aseismic Code

The parameters of Clough-Penzien model are obtained based on the response spectrum curve in the Chinese Seismic Code (GB 50011-2001). The power spectral density (PSD) of the acceleration at the ground level is evaluated by an iterative approach according to the equivalence principle of peak acceleration. The non-stationary nature of the ground motion is represented by the envelope function. The Clough-Penzien acceleration spectrum is selected to model the calculated PSD curve. The results show that the Clough-Penzien spectrum can fit the PSD curve well. The parameters of random model of ground motion given in this study provide relatively reliable and accurate earthquake motion input for stochastic seismic response analysis of structures.