The Analysis On Optimization Of Hanger Tensioning For Self-anchored Suspension Bridges

Self-anchored suspension bridge has been rapid development in recent years in our country, and it has drawn more and more attraction among the engineering for its merits such as graceful appearance, great flexibility and satisfactory economic features and so on. However, it has also brought many problems in design and construction because its mechanical characteristics, construction process are different from land-anchored suspension bridge. The key issues of design are the optimization of bridge cable force and the optimization of sling tension.Using the large finite element calculation and analysis program—MIDAS/CIVIL2006, this study proceeds the study on optimization of hanger tensioning for self-anchored suspension bridges. And basing on the Fujian Putian Mulanxi self-anchored suspension Bridge, the major research results achieved in this paper are as follows:(1) This paper discusses and analyses the optimal method of cable force of the self-anchored suspension bridge.First broke down the main force structure into a number of independent force structures, and assemble and determine the method of the bridge step by step. The determination of the optimal cable force can force the bridge system for the analysis of the object, and determines the dead load internal force of the bridge, and taking the Fujian Putian Mulanxi self-anchored suspension Bridge for example, carried out its cable force optimization analysis in this way.(2) This paper discusses the simulation of the model, including the model's construction and simulation of the slings of Tension, and describes the optimization method with the sling length of non-stress and tension to control the sling's grading tension.(3) This paper develops three Tension programs for Mulanxi Self-anchored suspension bridge and determines the optimal sling tension program through the simulation of the construction process and comparison of the Program's feasibility, safety and economy. And based on the optimal sling tension program, the paper discusses in detail the main cables, Sling and the girder's force and deformation characteristics in the construction process.