Surface Motion Evaluation of Terrace-Shaped Hill Subjected To Incident Plane Sv Wave Using Spectral Element Method

Abstract eng:
It has been recognized that effects of the local topographical and geotechnical characteristics are significant on seismic ground motion in the past researches. The terrace-shaped hill is a kind of local irregular topography which is widespread throughout southwest China. In this paper, the spectral element method is employed to investigate the site effects of twodimensional terrace-shaped hill topography subjected to incident plane P-SV waves. Firstly, the spectral-element model is established on fully quadrilateral meshes to simulate wave propagation by the terrace-shaped hill in a half-space. The wave field is typically represented in terms of high-degree Lagrange interpolants and integrals are computed based upon GaussLobatto-Legendre quadrature which leads to a simple explicit time scheme. Then the amplification of surface motions and the peak ground motion along each grade are calculated, and the seismic site effects of terrace-shaped topography on ground motion are evaluated. Finally, influences of some parameters related to the irregular topography, such as configuration of the terrace, characteristics of soil layers, angles of the incident wave, etc. are investigated. The numerical results show that there exist prominent topographical and geotechnical effects on seismic ground movement amplifications in the irregular configurations.

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