Stress Analysis Of Ramp Single Tower Cable-Stayed Bridge Joint And Jack-up Rebuilding Of Concrete-filled Steel Tubular Arch Bridge

With the quick development of the transportation, more and more long spanbridges are needed to be built to span wide rivers and ravines recently. In the great span's bridge, the Ramp Single Tower Cable-Stayed Bridge is one kind of modelling exquisite unique has the prospects for development new form, this kind of bridge usually uses the composite beam system, the joint between the steel box-girder and the concrete box-girder is the key technology by which the Ramp Single Tower Cable-Stayed Bridge will be designed. So there search on the working behavior of the joint will have important theoretic significance and reference value for practical application.Reviewed the cable-stayed bridge development process briefly, has analyzed the single tower cable-stayed bridge characteristic and the merit, introduced the composite beam cable-stayed bridge steel girder and concrete girder connect the spot the choice of location and the structural style, as well as intersection rigidity match concept and significance. Carries on the analog computation using the finite element analysis method to the Maxin bridge steel tong adapter section, has analyzed the adapter section two different material king post's rigidity match to its overall power transmission influence. When space stress analysis takes left side of the adapter section 10.75m the concretes girder section, right side 6.75m steel box girder takes the analysis scope, considered that the change concretes packing quantity and the steel girder stiffening rib size two aspects have established six computation models, adjusts the boundary condition and the thrust augmentation size, causes the adapter section the endogenic force and the spatial trussing structure computation endogenic force match case. Through to six models under the biggest axle strength, the shearing force and the bending moment three operating mode's longitudinal stress computed result's comparison and the analysis, obtains the adapter section best section structural types.Combining the rebuilding works of concrete-filled steel tubular arch bridge in Xianyue village, the detailed application of the concrete-filled steel tubular arch bridge lifting process were introduced. This bridge will experience several kinds of system transformation during lifting and the construction control technical difficulty is large. According to temporary cable tension optimization of the first system transformation and theoretical analysis of key stage during the construction period, certifies jack-up construction of concrete-filled steel tubular arch bridge was practicable on paper, stress and displacements monitoring of main phase in construction ensure the work splendidly accomplish on time, the theoretical analysis and the actual project to the union, have obtained the good economy and the social efficiency, and the method can be referred for rebuilding old arch bridge.