On Reliability-based Optimal Design Of Large Multi-troughs Aperture

The aqueduct is an important kind of conveyance water buildings in conservancy and hydropower projects, it more often using for irrigation and dramatic changes topography. With a long history and more mature construction technology, the aqueduct is in small size, the designer design often according to plane bent beam theory. But in recent years with appear of divert water from the south to the north project, the form of the actuate aqueduct make large-scale changes, the new design construction problems also raising.In order to satisfy the large span and big flow water requirements, the aqueducts of the south-to-north water transfer project in China has the distinctive feathers not only in its novel and unique structural, huge volume,large and big width compared with one in other irrigation,but aslot in its 3d prestressed bearing system, which can make transverse buckling deformation of this structure worth attention. And located in gully tuyere area ,the lateral wind resistance stability of this wih large size can not be ignore,which make it is a three-dimensional prestressed structure withVertical and horizontal deformation, lateral stability of wind pressure .Compared with the previous conventional aqueduct, this structure faces influence of uncertainty factors both in design patterns ,construction and application Therefore to carry out research in new design method and construction technology on this structure is urgent and necessary,and has important oretical and practical value to the actual engineering.With ANSYS software and reliability theory, Ming river of large rectangle aqueduct with priestesses side wall in divert water from the south to the north project as the model, basing on its original data carry on structure optimization study. By means of structural mechanics, reinforced concrete and structural reliability theory, regarding the six sectional dimension of aqueduct body as random variables, establish fourteen limit state equations which show the structure bearing capacity and applicability. basing on above equations, establish constraint equation of reliability indexes as the parameters with one section of aqueduct body cost as optimal target function, stability-design point method, complex method and ANSYS software carry on the optimizing, finally obtained the optimization results.