Concrete Super High Arch Dam Based On Finite Element Method Static And Dynamic Analysis Research

In recent years,with the increasing national strength and the continuous promotion of the western development strategy,a number of large-scale water conservancy projects are under construction in China,among which arch dams with strong overload capacity,high safety and small quantities are often the first choice.However,the southwest China,which has the most abundant water energy resources and the most intensive water conservancy projects,is located at the junction of Eurasian plate and Pacific plate.There are frequent earthquakes.The investment of the super high arch dam under construction is huge,the period is long and the construction is difficult.Once the dam fails,it will have disastrous consequences on the downstream.Therefore,it is particularly important to study the seismic response and stress conditions of the construction of extra-high arch dams in areas with high seismic intensity.Based on the research status of the arch dam and the finite element method static and dynamic analysis theory,this paper takes the Xiaowan super high arch dam as the research object,uses the ABAQUS software to establish the three-dimensional finite element model of the Xiaowan arch dam and conducts the static and dynamic analysis.Its main research content and conclusion as below:(1)The research summarized status of static and dynamic response of high arch dam at home and abroad and described the basic theory of static and dynamic analysis of finite element method.(2)Using ABAQUS established the finite element model of Xiaowan high arch dam,considering the interaction between the dam body and the reservoir water and foundation.Under the load of the dam body weight,hydrostatic pressure,sediment pressure,temperature effect,Six kinds of working conditions are used for static calculation to analyze the displacement and stress law of Xiaowan High Arch Dam.(3)In this paper,using Python to deal with the reaction force of nodes in batch to realize the application of additional mass of dynamic water.Modal analysis of empty reservoir,normal water level and check flood level is carried out.The time history analysis of Xiaowan arch dam is carried out by using artificial seismic wave software SIMQKE＿GR to generate artificial seismic wave.The displacement and stress of arch dam are calculated and analyzed.(4)The influence of peak velocity on the dynamic response of Xiaowan high arch dam is studied for the first time.The generated spectrum data of Xiaowan Hydropower Station is imported into the strong earthquake database of the Pacific earthquake engineering research center of the United States,30 measured ground motions are downloaded.After normalization,three ground motions with the same peak acceleration,peak displacement and different peak velocity are selected.The dynamic response of Xiaowan high arch dam is calculated when the peak velocity is 6cm/s,12cm/s and 24cm/s respectively.The influence of peak velocity and its change on its displacement and stress is studied.The results show that with the increase of the peak velocity of the ground motion,the displacement,the first principal stress and the third principal stress of each reference point of the dam body increase,and the maximum displacement is located at the arch crown beam of the dam top;with the increase of the peak velocity,the maximum first principal stress and the maximum third principal stress increase,but the maximum third principal stress of the dam body increases This shows that the maximum third principal stress of dam is more sensitive to the change of peak velocity,which should be paid more attention in the monitoring and operation management of Xiaowan high arch dam.