Research On Optimization Of Cable Force Of Cable-stayed Bridge With Single Tower And Single Cable Plane

Cable-stayed bridge is a kind of bridge which has longer span than others and adopted in long span bridge.The long span bridges are the important nodes in traffic establishment in usual, and with great significance. With the number of cable-stayed bridges built grows, its service state catches more attentions increasingly.Cable-stayed bridge is a kind of long span flexible system bridge, and its main beam offers the ability to commute for cars. Main beam is supported mainly by cables. Cables are the important part of a cable-stayed bridge, which undertake most load in construction stage and accomplished stage, and the internal force of the structure can be adapted through cable forces. The cable force is rational or not is the key factor to judge the rationality of the service state of a bridge, and its infection to service can not be ignored.There are many acknowledged theories and method to optimize the cable force, and each has its merit and insufficiency. This paper uses finite element software ANSYS to found a model, and firstly uses optimization module to carry out zero derivative optimization analyzing by minimum strain energy theory with appropriate design variables and state variables after confirming the validity of the model, and then uses first derivative optimization. By comparing the two internal force state, the result that bending strain energy will minish is got. At least the deflection of main beam under cable force optimized is in the acceptable field is validated.By reading amount of data and literature, whether the outcome of optimization is reasonable is judged through analyzing them. Then the unreasonable cable force is revised to make them match the basic knowledge.With the developing of relative theories and technologies, more rational cable force state must come true.