To study the force transmission performance and longitudinal bridge stress transfer path of the large-span hybrid steel-concrete beam joint section,the Hanzhuang Canal Bridge used as the engineering background,a combination of field bridge testing and numerical simulation is used to analyze the stress distribution and transmission law of the main beam steel-concrete beam joint section.The strain of the steel plates and concrete is monitored to obtain their stress distribution and transmission laws;the software ABAQUS is used to establish a refined finite element calculation model of the steel-concrete beam joint section,and the analysis results of the field bridge data are compared with the calculation model.The results show that during the process of stress transmission from the compressive plate to the concrete beam in the steel-concrete beam joint section,as the distance from the compressive plate increases,the stress gradually decreases,and the stress in the concrete beam section is minimal.The maximum stress on the compressive plate appears at the prestressed anchorage,with stress decreasing closer to the center and edge of the compressive plate.The overall stress at the top of the compressive plate is greater during the hoisting stage,while the stress at the bottom is greater during the tensioning stage,and the collected field data is consistent with the stress transmission law of the finite element model.
关键词
大跨径混合梁/钢梁-混凝土梁结合段/应力传递/承压板/有限元分析/实桥测试
Key words
long-span hybrid beam/the joint section of steel-concrete beam/stress transfer/pressure bearing plate/finite element analysis/in-situ bridge test
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