Calculation. Single Tower Cable-stayed Bridge Analysis And Stability Analysis

Based on the design scheme of the Jinjiang Bridge, the thesis focused on design and research of cable-stayed bridge with the single tower by building up the integrated finite element model with MIDASCIVIL ,a large-scale FEM software.The least bending energy method takes the bending energy as the objective function, and gets the reasonable cable forces by seeking the least bending energy. The cable forces obtained by using the method are uniform. But in the solving process, the area of towers, girders and cables is magnified artificially. The influence of pre-stress can't be exerted and the potential energy caused by cable is ignored, so cable forces in dense cable area are unreasonable. Using this method can only determine cable forces caused by dead loads, but can't by live loads. The stress balance method aims at the girders' reasonable moment, getting the cable forces by balancing the stress in girder's upper and lower margin. Using this method can consider the influence caused by dead loads and live loads meanwhile. But cable forces in dense cable area are unreasonable. The synthetic method takes the state determined by least bending energy as its initial state, which is the base to adjust cable forces. Then according to the girders'reasonable moment, cable forces are adjusted to get the reasonable forces. Using this method can make good use of the two methods, and the cable forces determined by this method are more reasonable than that of the two.At first, the author used minimum bending energy method combined with stress balance methodism to determine reasonable finished state, then adopted the backward analysis-forward iteration method to determine reasonable construction state. At last, the thesis researched the stability of finished states. Therefore, the static, stable behavior and analysing method of cable-stayed bridge with single towers were comprehensively understood.