Optimization Research On Reinforcement Scheme Of Concrete Gravity Dam

With the continuous development of national water conservancy project construction,more and more large-scale water conservancy projects pay more attention to the structural seismic safety in the process of design and construction.At present,for concrete gravity dam at home and abroad,the method of local reinforcement is usually adopted to improve the seismic performance of the structure.In order to study the optimal reinforcement scheme of concrete gravity dam,based on the damage sequence of each part of concrete gravity dam in earthquake,the optimization sequence of reinforcement position is deeply studied.According to the derived optimization sequence,the reinforcement scheme of each part is gradually optimized,and the dynamic response parameters obtained by nonlinear seismic dynamic analysis are compared,The optimal reinforcement scheme of each position is summarized,which provides a reference for the reinforcement scheme design of concrete gravity dam.The specific research work of each chapter is divided into the following aspects:(1)Different types of reinforced concrete finite element models are compared and analyzed.According to their different characteristics,the finite element model suitable for nonlinear seismic dynamic response analysis of concrete gravity dam is selected.Based on ABAQUS,a large-scale concrete gravity dam model in China is established to analyze the stress response,strain response and damage distribution of the non overflow section of plain concrete dam under gravity,uplift pressure,hydrostatic pressure,hydrodynamic pressure and seismic load,In order to determine the key weak parts of non overflow dam which need reinforcement.(2)Based on the damage sequence of each part of the dam in the earthquake,the optimization sequence of reinforcement location is analyzed theoretically.It is deduced that the reinforcement positions are optimized step by step according to the reverse order of the damage order of each part of the dam body in the earthquake.After the optimal scheme is obtained at one reinforcement position,the reinforcement scheme at this position remains unchanged.When the next position is optimized,the dynamic response between reinforcement positions has little influence and can be ignored.(3)According to the derived optimization sequence,the local reinforcement scheme of each reinforcement position of the dam body is gradually optimized.When a part is optimized,the maximum principal stress,maximum principal strain and damage factor of all reinforcement schemes in the part are extracted after nonlinear dynamic analysis.The dynamic response parameters of each scheme are expressed in the corresponding coordinate system in the form of coordinate points,and the points in the coordinate system are fitted to the surface by programming.The location of the extreme point in the fitting surface is analyzed,and the optimal reinforcement scheme is selected in the reinforcement scheme set.In this way,the optimal reinforcement scheme of each part is summarized.