Seismic Analysis Of U-shaped Aqueduct Structure Based On Bidirectional Fluid-solid Coupling

Aqueduct structure,as an overhead water-passing structure across obstacles such as rivers,roads and valleys,plays an important role in various water conveyance projects.While aqueducts bring great convenience to people's lives,their safety also needs to be paid attention to.With the development of society,China has put forward new requirements for seismic safety,canceling the unprotected areas nationwide.Considering the seismic factors of aqueducts has become the basic requirement of research.Studying the dynamic response of aqueduct structure under earthquake belongs to the fluid-solid coupling.Fluid-solid coupling analysis is based on the rapid development of computational fluid dynamics and computational solid mechanics.Therefore it is necessary to proceed from the two.The main research work based on the fluid-solid coupling method in this paper is as follows:1.The principle and classification of the fluid-solid coupling analysis method are summarized,namely directly coupled solution and partitioned solution.The advantages and disadvantages of each solution are analyzed.The technology of partitioned solution is discussed in detail.2.The governing equations of fluid-solid interaction based on inviscid and compressible fluid and the governing equations of sound-solid interaction based on compressible acoustic medium are analyzed and studied.The feasibility of acoustic-solid coupling instead of fluid-structure coupling is discussed.The finite element results of modal analysis calculated by this method are compared with the experimental results in the open literature,which proves that this method is effective.The dynamic response of aqueduct structure under earthquake is solved by partitioned solution,and the coupling is realized by the continuity equation of the interface.The accuracy of the partitioned solution is verified by the corresponding calculation examples.3.The calculation model of aqueduct is discussed and the parameters used in calculation are analyzed in detail.The dynamic characteristics of typical aqueduct structures under different water level conditions are calculated by acoustic-solid coupling method.The influence of water level height on the structure is analyzed.4.The dynamic response of aqueduct structure caused by different seismic waves is studied by using time history analysis method based on bidirectional fluid-solid coupling.Discussions are made from several aspects: multi-directional seismic action,stiffness of support,input angle of seismic wave,height of water level and velocity of flow.The change rule of aqueduct structure caused by each factor is analyzed.