Spatial Analysis Of Main Girder's Open Effect At Side Tower Of Long-Span Cable-Stayed Bridge

With the rapid development of domestic bridge technology, long span and extra-long span Cable-stayed bridge will be applied in transport hub more frequently. So the analysis of the its structure is essential. During the floatation and semi-floatation systemic cable-stayed bridge,the stress state at the intersection point of tower,beam and pier is very complicated. So it need to be paid special attention at the design and construction. Currently the research for this structure is not enough,so it is necessary to carry out a systematic analysis about this.The characteristics and development of cable-stayed bridge were described by this thesis at first,then take the Jinan Jianbang Yellow River Bridge as the background,take the relevant design and construction specifications as the standard and based on the relevant theory about concrete and FEM,make exhaustive simulation analysis of the entire construction process by establishing finite element model of plan frame, had considered the impact of a varity of construction loads to the bridge's stress and deformation at each construction stage and the stage after the bridge finished,and had analyzed the bridge's stress and deformation at the load combination of normal use limiting state and bearing capacity limiting state in operational phase. This essay has also detail analysis and computation checking on the cable capacity and bridge rigidity. Extract the internal force at both sides of the aperture girder at the load combination of normal use limiting state.To local analysis on aperture girders, use the internal force at both sides of the aperture girder as the needed partial boundary conditions of the model. Under with the effect of three-approached prestressed rinforcement, establish the entity model using the ANSYS which is a large-scale general FEM software. Then take three-dimensional simulation for the model,and analyze the stress distribution when conditions maximum positive shear or maximum nagetive moment happens. To each local area that should be pay attationed, this essay extract stresses nephogram and give the detailed analysis based on the relative theory. After finishing the detailed analysis and integral calculation of the aperture girder, then summarize relevant conclusion from main girder's aperture effect.