Dynamic Analysis Of Support Structure Of A Large Aqueduct In The Middle Route Of South-to-north Water Transfer Project

China is rich in total water resources,but the temporal and spatial distribution are not balanced,the temporal distribution characteristics presents more summer and autumn,less winter and spring,and the spatial distribution characteristics presents more west and less east,more north and less south.In order to alleviate the water crisis in some areas of China and realize the rational use of water resources,many large-scale water transfer projects have been built,such as the South-to-North Water Transfer Project,the Leading into the Qin Project,and the Dongshen Water Diversion Project,these large-scale water transfer projects are characterized by long distances,cross basins,and trans-regions.Through the construction of these projects,the water supply from the rich water area to the poor water area has been realized,the ecological environment of the water supply area has been improved,and the economic development of the water supply area has been promoted.The aqueduct is the most widely used form of cross-passing structure when the water transfer project intersects with rivers,valleys and roads along the way.A total of more than 40 water conveyance aqueducts have been built along the South-to-North Water Diversion Project.The structure is characterized by long span,large water section,large water flow and large weight.The supporting structure is the main load-bearing structure of the aqueduct,whether it has sufficient strength and stability directly affects the durability and safety of the aqueduct.Therefore,the static and dynamic characteristics of the supporting structure are the key factors that must be considered when designing the aqueduct.In this paper,a three-dimensional finite element simulation model of a large prestressed aqueduct in the middle line of the South-to-North Water Transfer Project is established by the large-scale general finite element analysis software ANSYS.The static and dynamic analysis of the supporting structure is carried out.According to the actual project selection,the aqueduct structure empty trough,design water level and full trough water level are used to analyze the static analysis of the supporting structure,and the static characteristics of the structure under different working conditions are studied;the dynamic characteristics of the supporting structure are analyzed by the three conditions of the aqueduct structure,the design water level and the full tank water level,and the self-vibration characteristics of the structure are studied;based on the results of the support configuration analysis,the ground motion response failure mechanism of the support structure is studied,and the dynamic response law of the support structure under ground motion is further revealed.