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Coupling standard ABAQUS FEM/XFEM with unbounded SBFEM user elements for seismic analysis of cracked concrete gravity dams
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杜
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DOI：10.1016/j.enganabound.2026.106865.png)
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Abstract
En 中文
Accurate seismic assessment of concrete gravity dams requires both a reliable representation of radiation damping in the unbounded foundation and a robust treatment of crack propagation in the dam body. This study presents an ABAQUS-based coupled analysis procedure in which the standard finite element method (FEM) and extended finite element method (XFEM) are used for the dam and near-field region, while the scaled boundary finite element method (SBFEM) is introduced through unbounded user-defined elements (UELs) to represent the far-field foundation and reservoir. In this way, the proposed framework combines the modeling flexibility of ABAQUS with the capability of SBFEM to simulate wave radiation in unbounded media using only the near-field/far-field interface. The procedure is first verified through elastic half-plane examples subjected to exogenous and endogenous seismic waves, where the computed responses agree well with reference solutions from enlarged-domain models and with results obtained using viscous-spring boundaries. The method is then applied to the seismic analysis of the Jin’anqiao concrete gravity dam with a pre-existing upstream crack. Comparisons of crest displacement, hydrodynamic pressure, principal stress, crack opening displacement, and final crack path show close agreement between the proposed method and the viscous-spring model, while clear differences from fixed-boundary results highlight the importance of radiation damping in crack analysis. These results demonstrate that the proposed procedure provides an effective and practical tool for the analysis of seismic response and crack propagation in concrete gravity dams.
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