Research On The Impact Of Structural Joint On The Dynamic Damage Behavior Of High Arch Dam

With the rapid development of economy, China needs more and more energy. However, the extensive use of fossil fuels, not only causing serious pollution to the environment, and also does not conform the concept of sustainable development. China has the richest water energy resources in the world, so it is necessary to develop water energy which is sustainable and clean. At the same time, China is located in an earthquake-prone area, so the seismic safety of the dam cannot be ignored. At present, for the majority of high roller compacted concrete (RCC) arch dam dynamic analysis only involves the transverse joints. There are few studies taking both transverse joints and induced joints into account. So it is meaningful to study the impact of transverse joints and induced joints on seismic performance of high RCC arch dams.According to the test model, established the finite element numerical model which consistent with the test model. Include a complete dam model, a transverse joint contained dam model and a both transverse joint and induced joint contained dam model. Use the concrete damage plasticity model to simulate the nonlinearity of dam material, and use Cohesive element to simulate the structural joints. Then compared the results of numerical analysis with model test results of the three models, and verified the reasonableness of the selected material model and also got the suitable peak intensity of the Cohesive elements. Thereby obtain a reasonable and effective numerical simulation method of structural joints and high arch dam.Use the obtained numerical simulation method to establish the numerical model of Shapai Arch Dam, the same three models established as above. And specification spectrum synthetic wave applied to the models. Then compare the results with each other from the aspect of stress, base frequency, and the damage distribution of upstream face. Found the impact of structural joints on the dam seismic performance and failure form. In addition, by the overload analysis of the model which contained both transverse joint and induced joint, found the damage process of Shapai Arch Dam under dynamic load and the damage develop form of the dam after structural joints damaged.And take the impoundment condition into consideration. Use the Westergaard add-mass model to simulate the influence of hydrodynamic pressure. Then by comparing the results of empty reservoir and full reservoir condition, found the reservoir water can keep the dam stay in preloading state, reduce the dynamic tensile stress and reduce the base frequency, and then improve the seismic capacity of the dam.