Analysis For The Effects Of Structure Parameters Of Self-Anchored And Single-Tower Suspension Bridge

As an ancient and young type of bridge structures, self-anchored suspension bridge has been developed based on the traditional suspension bridge structure. With the main cable imposed on large anchorage, the latter has always been the first choice in large span bridges.Yet self-anchored suspension bridge sets its main cable anchored on the girder instead of large anchorage,in this way suspension bridge would be apllied more widely in places where a large anchorage can’t be built because of poor geological conditions, or in a city which demands for graceful outline of this bridge structure, so that self-anchored suspension bridge has been popular and competitive in plan selection of urban bridges in recent years.With the support of new materials, technologies and techniques, self-anchored suspension bridge has got innovative development.As a typical self-anchored suspension bridge, Liede Bridge is designed with single arc tower and space curve, complex structure as well as unknown load-transferring mechanism among inner structural members, therefore there has been few of reference material to refer to, and it is worth to make a thorough study on the variety in internal force and displacement as different structural parameters changed.Based on Liede Bridge,the paper presents initial finite element models by Midas-civil soft on the basis of basic theory for suspension bridge and geometric nonlinear analysis.Then, accurate analysis on bridging shape of main cable in suspens ion bridge are given by the way of line, during which initial strain of cable element is changed continuously with the use of basic theory on mechanics of material to get the iterative solution, eventually node coordinates of the main cable and corresponding initial internal force of all elements are achieved, so the finite model is satisfactory for analysis of completed bridge state.On this condition, it thoroughly discusses effects on static behaviors of entire bridge as different structural parameters changed, and some useful conclutions are derived in the end, which has reference value for optimum structure design of self-anchored suspension bridges with arc tower and space cable or engineering practice.