| The Middle Route Project (MRP) for South-to-North Water Transfer is an extra-large typical water transfer project across the cities and drainage basins, which has an important strategic position in the construction of water conservancy and the development of national economy in the new century. The prestressed drainage aqueduct of through open-web truss arch structure is widely applied to cross the main canal of the MRP. It is important and significative to study the aqueduct's structure design and reliability thoroughly.On the MRP, the truss arch aqueduct is comprehensively researched in this paper, including its structural characteristic, structural calculation and reliability analysis. The comparative analysis is made firstly, which shows that the truss arch aqueduct can be built on the weak foundation and is also satisfied with the demand for large span length and the great discharge ability, so the type of aqueduct is a better for the project. Then the finite element program(Super Sap93)is applied to the structural analysis of the space structure.The truss arch structure is a three-dimensional higher statically indeterminate structure, and no definite expression of the performance function can be given for its unbelievable complexity. Based on the study for the methods of structural reliability analysis, including Monte Carlo Method, Response Surface Method and Stochastic Finite Element Method, Response Surface Method(RSM) is selected. Based on the random analysis of aqueduct's frequent actions and resistances, by RSM method together with the FEM method and FORM method, the reliabilities of its primary poles can be analyzed and the reliability of the structure be reached.The calculation result shows that the structural reliability comes to the target reliability index and contains definite safety stores.Therefore, the structure is safe and dependable. In addition, the researchers on the design and reliability of other drainage buildings can draw experience from the textual work.
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