Construction Simulation Computation And Analysis For Suspended Steel Truss Bridge

In recent years, suspension bridges develop fast in our country. As the most spanning ability type of bridge, it not only span river but also is used in canyon. Comparing with suspened steel box grider bridges, suspended steel truss bridge is more convenient in canyon. The paper takes the Beipanjiang River Suspended steel truss bridge in Gouzhou as the background and computes parameter of construction supervisory in the process of construction. suspended steel truss bridges will be satisfied with the requirment of design through the parameter of construction supervisory.The article takes the the analytic method as base and writes the main cable system program of suspension bridges acorrding two cable shape on the final status of suspension bridge: para-curve and segmental catenary. The unstressed length for main cable, stressed length for main cable, main saddle's pre-offset and vice saddle's pre-rotational-displacement and the coordinate of suspension centre are computed through the program. The homotopy algroithn and Aitken escalator method are used in the solution of nonlinear equations, which makes time of solution less and the results more exact.The paper establishes the finite element model of Beipanjiang River Suspended steel truss bridge in Gouzhou, the stress and deformation of main construction member are analyed under different load which include dead load, changing load, temperature load and wind load on the final status of suspension bridge.The parameter of construction supervisory is calculated on the base of different construction stage. During the construction of king-tower, pre-elevation and maximal offset limitation of king-tower are calculated; During the construction of mian cable installment, main saddle's pre-offset, vice saddle's pre-rotational-displacement,shape of main cable on initial status of suspension bridge, cable force, shape of primary standard cable, span centre height mark of primary standard cable and stretching force of anchor span are provided. During the construction of installment of stiff grider, the condition of main member bars stress is discussed with different linking method.Combining with engineering example, the article calculates and analyses some important parameter of suspended steel truss bridges'construction supervisory, and adjust and correct parameter acoording to the reality.