Design of a large-scale aqueduct in Middle Route Project of South-to-North Water Diversion

The designed flow of aqueduct of the main canal of South-to-North Water Diversion Middle Route Project was large.Through comparison of economic and technical indexes,the open box girder rectangular canal is adopted for a large-scale aqueduct,which is designed by 3-direction pre-stress.As the spatiality of the aqueduct force action,the cross-section selection and pre-stress were determined by plan bar system for the transversal and longitudinal calculation and the calculation results were checked by three-dimensional FEM.The non-linear thermal load and lateral wind load were mainly considered during check period.The results show that main parts of the aqueduct are in compressed state,and the local tensile stress is also in the scope of design code.