| HYDRAULIC ENGINEERING |
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Size effects of concrete gravity dams based on XFEM analyses |
| SHI Jie, LI Qingbin |
| State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Similarity model test results cannot be simply converted to the prototype without consideration of the size effect. The extended finite element method (XFEM) was used to analyze the failure mechanism and overall structure strength of a type of prenotched gravity dam. The size effect was investigated by analyzing the nominal strength of geometrically similar prenotched gravity dams with various sizes. The nominal strength and failure mechanism were analyzed for two sets of models with an extra centrifugal force and a self-weight force. The results show that the structural strength in the centrifugal models decreases exponentially and tends to be stable for larger sizes, while in gravitational models the strength decreases exponentially up to a critical height and then increases gradually due the self-weight contribution. The relative length of the fracture process zone is an intrinsic factor while the self-weight stress is an external loading factor for the effect of size on the structural strength.
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| Keywords
hydraulic structures
gravity dam
size effect
centrifugal model
gravitational model
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Issue Date: 15 April 2017
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2017,
Vol. 57
