Shear capacity of composite beams using numerous bolted shear connectors under static loads

Abstract

The structural system, which consists of composite slabs and steel beams, is considered an ideal structural architectural solution. It provides flexibility in

the spans and reduces the dimensions of the structural elements. The shear connector is the most important part of composite beams. Moreover, the shear studs

welded with the upper flange of the steel section are the most common. Several studies have focused on replacing these studs with a more efficient and effective type. Among them, a new technology called UPC has been introduced in Spain. This technology creates a complete shear connection, by forming small crown-shaped pieces into the steel sheeting, as an alternative to the usual embossing system in composite slabs. This paper tests the shear capacity of a new shear connector similar to the UPC technique to use in composite beams. The new shear connector is four steel angles fixed by bolts and looks like a crown. The push test was modeled with the new crown connector by Abaqus software. The failure modes were studied. The relationship between the force and slip was drawn for different concrete grades. The analytical model has been verified by comparing it with the results of previous studies conducted on different shear connectors. This paper introduces the idea of creating shear connectivity by using semi crown-shaped that could replace the old technology using welded studs. As result, the crown shear connector, which was made up of four bolted metal angles, provided a high shear capacity and could be used in place of welded studs. Furthermore, the crown shear connector demonstrated ductility when C58 concrete was used.