| With the rapid development of highways in our country, bridge construction has come in the upsurge period which is unknown before. And among the various bridge types, the long span prestressed concrete beam bridge is widely used for its advantages, and then has being developed rapidly.The long span prestressed concrete bridge has typical characteristics in its design: one is that its design is closely related to construction method, and because of the system transferring during its construction it is difficult to obtain its rational prestressing system. It is affected by many factors, such as construction method, creep secondary internal forces, secondary internal forces caused by exerted indeterminate structure and so on; the other is in the working drawing of the prestressing cables. Normally there are hundreds of cables in a continuous beam bridge, especially in an indeterminate structure. And the shape of the prestressing cable is complicated, so it has great difficulties in its drawing. So it is urgent to develop the CAD system of such a kind of bridge.Based on such characteristics and the researches of the country and outside, this paper mainly studies at the automatic distribution of prestressing cables of prestressed concrete beam bridge and the automatic working drawing of the steel bundles.In this paper, based on the study of the group of the project, it sets up a fuzzy optimum math-model of the prestressed degree for prestressing cables disposition of prestressed concrete continuous beam bridges. And in the drawing of the steel bundles, the set up of the "prestressing cable model" makes its courseconvenient. And it used such a file type-DXF, to save the drawing. Thus itmake it freely to exchange date with AutoCAD and other applications.Then it gives an example of the engineering application-Xiangfan SiQiao. And at last, several valuable conclusions are summarized, some shortages and the future research orientation are also put forward at the same time.
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