ABSTRACT
In this paper, the finite element finite difference method based on the transmission boundary is used to describe the terrain effect by using the magnification of the response spectrum of the terrain to different control periods. The effects of different input ground motions, including actual ground motion input, artificial ground motion input, simulated ground motion input, white noise input and pulse input, on the ground motion topography effect are studied. The results show that the average spectral ratio curves calculated from the actual ground motion input, the artificial ground motion input and the simulated ground motion input are relatively close; compared with these three types of input, the average spectral ratio curves calculated from the white noise input are larger in some periods; while the spectral ratio curves calculated from the pulse input are quite different from those calculated from the ground motion input. Therefore, in the study of the amplification effect of local topography on response spectrum, it is suggested to use the simulated ground motion and the actual ground motion recording input. In addition, the influence of the input ground motion uncertainty on the regression results should be taken into account when determining the empirical model of amplification coefficient of local convex terrain to seismic response spectrum.
