Spatial Effect Analysis of Long-span Bridge with Variable Height Composite Steel Box Continuous Girder
Different from concrete girder bridge and steel box girder bridge,long-span variable height composite steel box continuous girder bridge has its spatial stress characteristics.In this paper,a long-span variable height composite steel box continuous girder bridge is studied,and a spatial finite element model is established to explore its spatial stress characteristics from three aspects:vertical shear distribution law at the end and middle support cross girder and partial load coefficient.The results show that:(1)for end cross girder of the composite steel box girder,the vertical shear force borne by the roof concrete is little,and the shear force mainly depends on the web of the steel box girder.(2)For the middle support cross girder of composite steel box girder,the vertical shear borne by the roof concrete is little,and it mainly depends on the bottom concrete and the web of steel box girder.The closer to the middle beam,the greater the proportion of vertical shear borne by the bottom concrete is,and the maximum is 45％.(3)Under the action of vehicle partial load,the partial load coefficient of normal stress is small,but the partial load coefficient of web shear is large,and the maximum partial load coefficient of shear at the middle support is 1.76.The research results have a certain guiding significance for the design and calculation of long-span composite steel box girder bridges.
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