Static Analysis Of Large Aqueduct Structure Considering Prestress Loss

Due to the phenomenon that the distribution of water resources in China is more and less in the north and south,it is more prone to flood in the south and drought in the north,which threaten the safety of people’s lives and property.In order to solve the uneven distribution of water resources,ensure that the residents of northern cities have sufficient water use and improve the quality of life of the people.which provides a continuous stream of high quality water resources for the northern water shortage cities.The quality and safety of the project has always been the focus of attention of the government and the people.As an important part of the South-to-North Water transfer Project,the aqueduct has attracted much attention because of its "top-heavy" special engineering structure.In order to improve the overall structural performance,the aqueduct adopts prestressed reinforced concrete structure.Stress loss will occur in the long-term operation of prestressed steel bar.Compared with the mechanical properties of aqueduct before and after prestress loss,it is of great significance to obtain the influence of prestress loss on the performance of aqueduct structure.To this end,the following research work has been carried out:(1)This paper summarizes the characteristics of prestressed concrete aqueduct,gives the calculation method and formula of each section stress of aqueduct structure when considering prestress,enumerates the influencing factors of prestress loss,and gives the formula of calculating prestress loss by consulting engineering data and itemized calculation method.(2)Based on the initial strain method,the simulation of prestressed steel bar is realized in the ABAQUS of large-scale general analysis software,and the stress value and main stress cloud diagram of aqueduct section under four different working conditions are obtained(normal water depth,increased water depth,normal water depth + sudden temperature rise,normal water depth + sudden temperature drop),which verifies the rationality of engineering design.(3)The stress value and stress cloud diagram of each section of aqueduct under 4working conditions(normal water depth,increased water depth,normal water depth + sudden temperature rise,normal water depth + sudden temperature drop)after prestress loss are obtained by using the method of applying external load in the software.