Abstract
Two earthquake input models are introduced: the massless foundation model and the viscous-spring boundary model considering radiation damping. Linear elastic and nonlinear contraction joint opening analyses of the 210 m high Dagangshan arch dam are performed using the two models. The responses of the three-dimensional canyon without the dam are analyzed with massless-truncated foundation and viscous-spring boundary; then, linear and nonlinear analyses of the dam–foundation system are performed and compared using the two models. Hydrodynamic effects are considered using finite element discretization for incompressible reservoir fluid. Stresses, displacements and contraction joint opening in the dam are significantly reduced in linear and nonlinear analyses using the viscous-spring boundary model. In linear analysis, the massless foundation model with a high damping ratio of 10% leads to a similar response to that using the viscous-spring boundary model. Maximum tensile stresses from nonlinear analysis are 10–25% larger than those from linear analysis owing to a partial release of the arch action.
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