Static and fatigue behavior of steel-concrete composite beams with corroded studs

摘要

This study presents an experimental study on the static and fatigue behavior of steel-concrete composite beams subjected to negative bending moment. A total of 10 specimens were tested, with a special focus on the effect of corroded studs. The load-carrying capacity, beam stiffness and fatigue life of specimens having different corrosion rates were evaluated. Test results showed that the specimens subjected to monotonic loading failed by local buckling while fatigue loading led to shear fracture of the studs and crack initiation followed by propagation in the steel beam. Corrosion of shear connectors had a significantly detrimental effect on the load-carrying capacity and stiffness of the composite beams. As the corrosion rate increased, the fatigue life of the beams was dramatically declined by up to 29.69%. The residual bending stiffness and slip stiffness decreased as the fatigue cycles elapsed. (C) 2019 Elsevier Ltd. All rights reserved.