Analywis on Calculation Method of Large Cantilever Wide Width Concrete Box Girder
In order to study the calculation and analysis method of large cantilever wide width concrete box girder,the simplified model-ing method of the bar system element model of the box girder is studied by referring to the existing calculation model of the wide width concrete box girder.The calculation length of the axillage on both sides of the beam and the top and bottom bridge panels are analyzed,and the calculation length of the top and bottom plate thickness is 0～10 times,respectively.Combined with midas Civil analysis of the main tensile stress and the maximum negative bending moment at the top of the girder,the optimal length of the bridge panel for this type of box girder is explored.At the same time,Abaqus 3D software is used to establish a solid model,and the calculation results of the linkage unit model are compared to verify the rationality of the modeling method.The results show that the calculation length of 4 times the thickness of the top and bottom plate on both sides of the section is the most reasonable,and the main tensile stress at the top of the beam is reduced by 7.8％compared with the calculation method of the conventional concrete wide box girder,and the result is more secure.According to the comparison,the results of the transverse isolation beam model of large cantilever wide width concrete box girder by using this calculation method are close to those of the solid model,and the transverse principal stress and principal tensile stress of the transverse isolation beam only increase by 7.7％ and 2.7％ respectively.
large cantilever wide width concrete box girdertransverse spacer beamAbaqusrod model
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万方数据
