Analysis On The Static And Pre-stressed Properties Of Long Span Cable-stayed Structure

With the rapid development of long span structure, the advantages of the cable-stayed structure composed of three basic parts: stayed cables, pylon tower and rigid structure are becoming more and more prominent. It is a new type of hybrid structures, which has been adopted extensively in bridge and building structures. However, the analytical methods and theories lag behind the common applications in civil engineering, especially about researches on pre-stress exerting and pre-stress effects.The stay cables are crucial components of the cable-stayed structure, so accurate numeric analysis with the calculation technology will improve the analytical theory of cable-stayed structure. Analytic equation was deduced and analytic formulation of some parameters was got in this paper. Moreover, the comparison between catenarian theory and parabolical theory was made. Different finite-element methods followed by their merits and drawbacks were also introduced.The primary sources of geometric nonlinearity of the structural system and analytical theories concerned were investigated. Besides, how to deal with the nonlinear features and some key problems related were considered, the reasonable structure model was established by ANSYS software in the paper.The influences of pre-stress in the cable-stayed structure on the performence of structure were discussed in detail. Under two states — initial equilibrium state and load equilibrium state, the effects of nonlinearity on the static performence of structure were investigated. The different effects of nonlinearity were also studied under the instances of pre-stress exerted or not.The nonlinear analysis of parameter influences for the structural pre-stress effects was carried through. When the parameters such as methods of cable arrangement, height of pylon tower, height of beam changing, the alteration of the pre-stress effects was investigated. The change of tension force and its vertical component force of the cables were studied with the introduction of the vertical force component coefficient of the cables. It was found that the number of cables and the height of tower had tremendous influence on cable force, endogen forces of tower and beams. However, the height of beams had little influence. At last, some proposals about reasonable structure configuration were put forward for references in the structure design and theoretic researches of the cable-stayed structure in the future.