Fatigue behaviour of composite steel and concrete beams with stud shear connections

Abstract

The fatigue behaviour of composite steel and concrete beams with stud shear connectors is unusual because the mechanical properties of the connectors are continually changing under the application of cyclic loads. Tests have conclusively shown that stud shear connections reduce in strength and stiffness immediately after cyclic loads are applied; however, friction at the interface between the concrete slab and the steel beam reduces the forces on the stud shear connectors. These effects can both enhance or reduce the endurance, stiffness and strength of the composite beam, which makes the fatigue design and assessment a very interesting and unique problem. This review describes the changes in properties that occur due to cyclic loading and the mathematical models that have been developed both to simulate the fatigue behaviour of composite beams and to estimate their remaining strength and endurance.