某混凝土重力壩地震動響應(yīng)及敏感性研究
[Abstract]:China's water conservancy projects have a very important impact on the country's economy and politics as well as people's lives. However, many areas in China are located in the earthquake zone. Once the project is wrecked, it will bring disastrous consequences. Therefore, it is urgent to ensure the safety of hydraulic structures in the earthquake. In view of this problem, this paper combines Longtan Dam. The finite element aseismic analysis of gravity dams is carried out by an engineering example to provide relevant reference information for the future research on the aseismic performance of gravity dams. Combining with the relevant design methods of hydraulic structures, this paper establishes the models of gravity dams under three working conditions: empty reservoir, dead water level and checking flood level by using the finite element ANSYS analysis software. Considering the fluid-structure interaction between reservoir water and dam, the seismic response of gravity dam is analyzed. The weak position of gravity dam under earthquake and the response of gravity dam under different water levels are analyzed by analyzing the related data and cloud pictures. Considering the action of wave load, the seismic response of the model under the condition of checking flood level is analyzed. Meanwhile, the influence of wave force on the gravity dam is analyzed by comparing the results of the model analysis under the condition of checking flood level without considering wave load. The greater the seismic intensity of the dam site, the stronger the seismic action and the greater the hydrodynamic pressure; the different wind speed in the region will cause different wind waves, and the wave loads on the dam body will be different. The tensile properties are mainly controlled by the mechanical parameters of the material. In this paper, a three-dimensional model analysis program is compiled by using the APDL language of ANSYS. Based on the plastic damage constitutive model of concrete, the finite element analysis of gravity dam is carried out. By changing the elastic modulus and tensile strength of concrete, the tensile plastic damage constitutive curve is changed, and different constitutive curves are established. The sensitivity of concrete to the seismic response of the dam is analyzed by finite element analysis.
【學(xué)位授予單位】:廣州大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TV312;TV642.3
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