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Seismic Safety Evaluation of Cracked Concrete Gravity Dam
Concrete gravity dams may break into several blocks by penetrated cracks under action of strong ground earthquake motion. The places of penetrated cracks are determined first by adopting a concrete damaged plasticity model and considering geometric nonlinearity of the crack based on nonlinear FEM. Then, a "hard" contact algorithm is adopted to simulate normal interaction of the crack and a Coloumb friction model is employed to simulate tangent interaction of the crack. With three different seismic peak accelerations, the seismic stability of Koyna Dam is discussed in detail. The results show that the dam will be stable when the horizontal peak acceleration is less than 0.061g. It also shows the friction coefficient have a great effect on stability of the dam. The maximum sliding displacement of the top block will lesson and the maximum opening displacement of the upstream end will increase with an increasing friction coefficient of the crack.
Seismic Safety Evaluation of Cracked Concrete Gravity Dam
Concrete gravity dams may break into several blocks by penetrated cracks under action of strong ground earthquake motion. The places of penetrated cracks are determined first by adopting a concrete damaged plasticity model and considering geometric nonlinearity of the crack based on nonlinear FEM. Then, a "hard" contact algorithm is adopted to simulate normal interaction of the crack and a Coloumb friction model is employed to simulate tangent interaction of the crack. With three different seismic peak accelerations, the seismic stability of Koyna Dam is discussed in detail. The results show that the dam will be stable when the horizontal peak acceleration is less than 0.061g. It also shows the friction coefficient have a great effect on stability of the dam. The maximum sliding displacement of the top block will lesson and the maximum opening displacement of the upstream end will increase with an increasing friction coefficient of the crack.
Seismic Safety Evaluation of Cracked Concrete Gravity Dam
Jiang, Shouyan (author) / Du, Chengbin (author) / Liu, Zhiming (author)
Technical Council on Lifeline Earthquake Engineering Conference (TCLEE) 2009 ; 2009 ; Oakland, California, United States
TCLEE 2009 ; 1-9
2009-06-24
Conference paper
Electronic Resource
English
Seismic Safety Evaluation of Cracked Concrete Gravity Dam
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