Various prestressing methods are considered to prevent the undesirable crack of concrete slab in steel-concrete continuous composite girder. When the studs for shear connection between concrete slab and steel girder are welded in the form of group, we can introduce the prestress effectively only into the concrete slab by using the internal prestressing tendons. However, mechanical characteristics of the composite girder with grouped studs are not clarified perfectly. In this paper, therefore, an analytical treatment and the calculated results of composite girder with grouped studs are reported and discussed.
