Abstract
Structures crossing irregular topography features such as canyons and mountains may suffer from spatially varying ground motions due to topographic effect. In this paper, a two-dimensional substructure model of water-solid interaction in canyon site is proposed to study the effect of canyon topography on the seismic responses of water-canyon system, in which the wave radiation effect of infinite solid domains is simulated by the combined zigzag-paraxial boundary and the solid-water interaction is considered by interface conditions. Moreover, to verify the proposed substructure model, it is used to calculate the seismic responses of a V-shaped water-canyon system and a semi-circular water-canyon system under obliquely incident P-SV waves in homogeneous half space. Afterwards, we conduct the seismic analysis of water-canyon system. The results indicate that the amplification and reduction of ground motion is affected by geometric shape of canyons and water depth, and the maximum amplification of V-shaped water-canyon system can beyond an order of 200%, and the maximum amplification of semi-circular water-canyon system is less than 200%.
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