Research On The Application Of Temporary Horizontal Braces In The Construction Of Cable-stayed Bridge

Cable-pylon bridge is a high-order complex statically indeterminate structure and its pylon is the main load-bearing component, almost all dead load and live load of the bridge are transferred to the foundation at the bottom of pylon through the pylon, so that the pylon is the key to the design and construction control of such bridge. In consideration of the fact that such a bridge is susceptible to wind, and the internal forces of its cables are usually very large, especially for a special-shaped pylon, besides, the deformation and stress distribution of the pylon are obviously of space in nature, the construction quality of the pylon plays a vital role for the entire bridge. By taking a actual cable-stayed bridge under construction as the supporting project, the temporary horizontal braces of its pylon during construction were analyzed in detail.Firstly, the paper analyzed the possible factors which might affect actual geometric configuration and internal forces of the pylon of the bridge, and with the focus on the main content for the construction of the pylon, it analyzed the effects of various factors on the construction control of the pylon so as to determine the main factors affecting the configurations of the especial-shaped pylon.Secondly, according to the structural characteristics of the epical-shaped pylon in the project, during construction of the four oblique columns at lower and middle height of the pylon, at three heights temporary horizontal braces are used to control geometric configuration and internal forces of the pylon. software MIDAS / CIVIL for the calculation of bridges was adopted to establish construction process model for the project, with which analysis was conduct for the offset and stresses at each construction stage of the oblique columns to determine the effect of temporary horizontal braces.Finally, the main data which are necessary for the construction control of the pylon in the project were analyzed, and the main parameters the temporary horizontal braces for the construction control of the pylon were put forth. Study indicates that the analysis of the model can provide reference for design and construction of the pylons of a cable-stayed bridge.