Influence of Separation Length of Link-Slabs Structure on Overall Mechanical Behavior of Composite Beams
In order to clarify the influence of the separation of the steel beam and the concrete bridge deck at the middle fulcrum on the mechanical performance of a long-span dead load composite beam bridge,a practical project is analyzed and studied using the shell-solid finite element method.The mechanical performance differences of the composite beam under conditions of separation and complete connection of the bridge deck and the steel beam at the middle fulcrum are examined.Additionally,the influence of changes in the length of the separation section on the overall structure and the stress of the plate near the middle fulcrum is analyzed.The results show that setting a separation section within a certain range near the middle fulcrum has little effect on the overall stiffness of the composite beam.However,it can reduce the stiffness of the steel-concrete connection,effectively decrease the tensile stress on the upper surface of the concrete at the middle fulcrum,and thus alleviate the cracking problem of the concrete.For a 60m span composite beam,the length of the steel-concrete separation section at the fulcrum should be set to about 11％of the single span.
bridge engineeringcomposite structurelink-slabsconnectorsmechanical performancereasonable range
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