| In this thesis, the dynamic characteristics and the seismic response of overflow section of gravity dam are studied by FEM. The distribution laws of seismic displacements and stresses in overflow section of gravity dam are analyzed.In theories, the relative theories about dynamic are introduced concisely, including basic conceptions in the dynamic analyze, the dynamic equations of multi-freedom and solution for them. The response of spectrum is introduced.The special questions about gravity dam in dynamic analysis are studied; how to select the model in finite element analysis; the coupling libration of water and dam; the effect between groundsill and dam. Especially, the author researches the coupling libration of water and dam detailedly.In practice, xiangjiaba dam is taken as an example, by the software ANSYS, according to the model analysis and the theory of response of spectrum, the dynamic characteristics and the seismic response of overflow section of gravity dam are studied.The height of dam in engineering range is changed, the laws of effects on seismic displacements and stresses of overflow section of gravity dam from different height are researched.The elasticity of groundsill in engineering range varieties, the laws of effects on the distribution laws of seismic displacements and stresses in overflow section of gravity dam from the elasticity of groundsill are studied.At last, after drawing a conclusion of the work of the paper, the expectation of advanced research is put forward. |
