The paper analyzes the failure of composite steel-concrete beams with stud shear conn·ectors. Due to cracking damage in concrete, the studs fail in a brittle manner, exhibiting a post-peak decline of shear force with increasing slip. The load-deflection diagram of…
The paper analyzes the failure of composite steel-concrete beams with stud shear conn·ectors. Due to cracking damage in concrete, the studs fail in a brittle manner, exhibiting a post-peak decline of shear force with increasing slip. The load-deflection diagram of a. composite bea.n1 in which the stud failures propagate a.long the steel-concrete interface is analyzed and the size effect determined. A satisfactory agreement with the limited test data available in the literature is demonstrated. The :numerically calculated size effect is explained by energy analysis, which indicates that, in the usual case that the studs are not scaled, there is a reverse size effect for small sizes followed by a gradual transition to the usual asymptotic size effect of LEFM type for large sizes. In the case of perfect geometric scaling, in which the size of the studs and the steel-concrete interface area per stud are increased with the beam size, there is a compound size effect, in which the size effect in the failure of individual studs is superposed on the size effect due to the propagation of connection failure along the beam, resulting for very large sizes into a size hyper-effect that is stronger than that in LEFM.