Sensitivity Analysis of Structural Parameters of Cable-Stayed Bridge with Inclined Pylon and Back Stay Cables

In order to improve the construction control accuracy of the cable-stayed bridge with inclined pylon and back stay cables,the Hongdun Road River-Crossing Bridge in Altay City was taken as the engineering background.The finite element calculating programme MIDAS Civil was used to establish the three-dimensional finite element model,using the simulation analysis method to study the sensitivity of different design parameters.The impact pattern of parameters,such as temperature variation,dead weight of the structure,cable force during the construction and the rigidity of the main girder on the geometrical shape and the internal force of the main girder and the displacement of the bridge pylon in completed bridge state,was analyzed.The results of the calculation show that temperature changes have great influence on the cable force of the completed bridge;temperature changes and errors of cable force during construction can exert great influence on the geometrical shape and internal force of the main girder and the displacement of bridge pylon;and the dead weight of the structure has certain influence on the condition of the completed bridge.The construction monitoring of Hongdun Road River-Crossing Bridge was done by modifying the main design parameters and ignoring the peripheral parameters,as a result,the geometrical shape of the completed bridge was good and the errors were within the allowable range.