| ABSTRACT:Combined bridge of continuous girder and arch is a bridge to get fast development. As a new type of combined structure, it can take full advantage of the superiority of arch, avoid bridge pier bearing the horizontal force. It has a large vertical stiffness and the advantages of good dynamic behavior, especially suitable for high standard requirement of the construction of the railway. On the background of Kunyang grand bridge on Wenzhou-Fuzhou railway, the finite element model was established by the spatial three-dimensional analysis software Ansys and Midas. The transverse stress of continuous girder and arch combination structure and the effect of setting different thickness diaphragm on the structure were analyzed in detail. The dissertation has mainly dealt with the following aspects:(1) Introducing the existing box girder transverse internal force calculation method and the commonly used mechanical theory of box girder structure.(2) Establishing the Ansys three-dimensional entity unit model of Kunyang bridge, studying the distribution rule of transverse stresses of top plate along the longitudinal position. Respectively selecting the sections on the side span region, middle span no suspender region, middle span suspender region, calculating the transverse stresses with the rigid support method and the rigid support method with differential displacement. Comparing the results with the Ansys entity model results, verify the reasonability of the rigid support method and the rigid support method with differential displacement.(3) Establishing the super-large Kunyang bridge entity unit models with different thickness diaphragm, discuss the effect of different thickness diaphragm on the support force, the longitudinal bending stress, transverse bending stress and the torsion properties of the structure. Through drawing the related conclusions, this paper tries to provide some suggestions and references for the design of diaphragm... |
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