Mechanical Analysis of the Influence of Rubber-Sleeved Stud Connector on the Steel-Concrete Composite Girder

Abstract:

To study the mechanical properties of the rubber-sleeved stud connector and its influence on the steel-concrete composite girder， 5 groups of 15 push-out test specimens are designed and fabricated. The mechanical behavior of the rubber-sleeved stud connector is revealed by using the static loading test while the influence of the rubber-sleeved stud connector on the steel-concrete composite girder is analyzed by using the FEM（finiti element method） models. The test and finite element analysis results show that the rubber-sleeved stud connector helps to reduce the shear stiffness of the push-out test specimens without decreasing the carrying capacity. Meanwhile， the rubber sleeve has little impact on the mid-span deflection and the stress in the steel girder but magnificently decreases the stress in the concrete slab at the mid-support. For composite bridges using shear connectors with a diameter of 22 mm and 19mm， the tensile stress in concrete slab decreases by 26 % and 13 % respectively. As for the problem of sudden stress change， a transition area of 2m at the intersection of the positive moment region and the negative moment region can reduce the stress mutation by 30 %， which effectively improve the adverse condition in the stiffness changing region.