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Seismic response analysis of arch dam-water-rock foundation systems

Du Xiuli (杜修力)1 and Wang Jinting (王进廷)2

1. Beijing key laboratory of earthquake engineering and structural retrofit, Beijing University of Technology, Beijing 100022, China

2. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China

Abstract: The effect of water compressibility on the seismic responses of arch dams is not well understood. In this paper, a numerical model is developed with rigorous representation of the dynamic interaction between arch dam-water-rock foundation. The model is applied to the seismic response analysis of an arch dam with a height of 292m designed to a seismic intensity of IX. It is shown that consideration of the water compressibility clearly decreases the stress responses at key positions of the dam, while the added mass model gives a conservative estimate.

Keywords: seismic response; arch dam; water compressibility; dam-water-foundation interaction; added mass model; finite element method