STUDY ON THE MECHANICAL BEHAVIOR OF SPLIT-JOINT OF LONG-SPAN BOX GIRDER BRIDGES
Considering the material,connection structure,and width of joints a numerical model is established by ABAQUS to study the local mechanical performance of the joints connecting two large-span box girder bridges.The foundation settlement difference,and the creep difference and the shrinkage in concrete between two bridges are ap-plied on the joints,after which the deformation and maximum stress of the joints are compared.The results show that Engineered Cementitious Composites(ECC)for joints can meet the requirements of stress and deformation of joints of large-span bridges than Ultra-High Performance Concrete(UHPC).Compared with ordinary steel bars,the over-all deformation including joint and the box girders are more coordinated by using corrugated steel plates due to stretching effect.As the width of the joint increasing,the stress of the box girders reduced,however,the tensile ca-pacity of the corrugated plate cannot be fully utilized.Finally,through the analysis,the optimization scheme of the splicing joint is proposed,providing the reference for the widening design of the long-span box girder bridge.
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