Static And Dynamic Analysis Of The Finite Element Method Of Concrete Gravity Dam Based On ANSYS

With the rapid development of China's hydropower industry and the continuous improvement of concrete gravity dam,a large number of concrete gravity dams have been designed and constructed in the southwest and northwest regions with abundant water resources,however,these areas are in high intensity earthquake prone regions.Under high-intensity earthquake,the seismic safety of gravity dam is directly related to the safety of the people's lives and property in the downstream area,therefore,it is of great practical significance to study the seismic behavior of water retaining structures such as gravity dams.This paper takes a dam for example,by using the method of three dimensional finite element analysis of static and dynamic,The static and dynamic characteristics and the seismic safety of the concrete gravity dam under high earthquake intensity are studied and discussed in depth.This paper briefly introduces the theoretical basis and calculation method of finite element analysis and dynamic and static,as well as the structural modal analysis and response spectrum method used in this paper,the theoretical basis is provided for the calculation and analysis of the paper.The use of large software ANSYS unit to establish the three-dimensional model of gravity by solid45(bedrock)and SOLID65(dam),and the three-dimensional model of gravity is established,the static analysis of structure,the deformation and stress distribution of the dam under different working conditions are analyzed:(1)The maximum displacement and vertical displacement of dam in the direction along the river appeared in the top of the dam.The displacement along the direction and the vertical direction is from bottom to top slowly increases.Henghe direction displacement and direction of river and vertical displacement difference,the maximum displacement is at the bottom.(2)The dam along the river is generally stress compressive stress,in the dam heel small tensile stress convergence.vertical stress in compressive stress,also appears in the dam heel and the dam upstream face of dam small tensile stress convergence.The natural vibration frequency,vibration period and vibration mode of the dam are analyzed by means of modal analysis and the natural vibration frequency of the dam are analyzed respectively:(1)Under the action of the hydrodynamic pressure,the normal water level of the gravity dam is lower than that of the air reservoir,this is mainly due to the increase in the mass of the structure,which leads to the decrease of the vibration frequency of the dam due to the change of the stiffness of the dam body.(2)The normal water level of the dam under the first order vibration type is mainly along the river direction vibration,2nd order vibration type is dominated by vertical vibration,the 3rd order vibration mode is dominated by Yokogawa direction of vibration,the four modes around the vertical direction around a slight wobble and 5th order mode after the twist.Using the mode decomposition response spectrum method for dynamic calculation of dam,analysis of dynamic characteristic of the dam shows that,under the action of earthquake mainly stress tensile stress,the larger tensile stress gathered in the dam,the dam heel and crest at,its value over the concrete tensile allowable value,need to take increase the strength of concrete or suitable reinforcement measures to reduce the large stress gathered.The research results of this paper have some reference and reference value for the design of similar projects.At the end of this paper,the work is summarized,and the development direction and Prospect of further work are proposed.