Bending Capacity Analysis And Model Test Of Composite Joint

With the quick development of the transportation, more and more long span bridges are needed to be built to span wide rivers and ravines recently. When either concrete beams or steel beams are used, the negative reactions will occur at the pier top in side span. Moreover, extensive deflections at main span and pier top will be caused in long span bridge. To avoid the disadvantages, composite beam structures are developed, in which the steel girder are used in partially or whole of the main span and concrete girder are used in side span. The advantages of the compression resistence of concrete and spaning ability of steel are combined in this strutures.Foshan Dongping bridge is an arch which adopts the composite beam as main girder. Considering the complexity of the stress distribution of the joint zone connecting the PC girder and steel girder, which is difficult to be obtain on by theory or numerical methods. The static and fatigue behaviors of the joint zone are studied by model test in detail.This thesis adopts the method of model test and finite elememt simulation analysis to investigate the structure behavior, force transmission, stress distribution of the joint zone. the following aspects are included in this thesis:1. The finite element simulation anslysis method are used to analyse the structure and compare them with the result of the model test.2. The deformation regular of the steel-concrete joint has been analysed under the dead load and fatigue load.3. The structural characteristics of the steel-concrete joint has been analysed.4. The stress distribution of the components has been analysed, the forcing behavior of the different materials has been discussed under the design load.5. Ultimate capacity and safety of the steel-concrete joint are analyzed. The appearance and the development of the cracks and the failure of the structure are also discussed.6. Structural behaviors of the steel-concrete joint under the fatigue load are analysed, the effect of fatigue load on the rigidity and stress distribution of the structure are analysed.