Composite Shear Head Systems for Improved Punching Shear Resistance of Flat Slabs

Abstract

For high rise buildings a combination of flat concrete slabs and composite columns is becoming increasingly common and leads to very economic structures. Where composite columns with small dimensions are used, often the resistance to punching shear is relevant for the slab thickness. In order to avoid localized thickening of the slab, especially in case of small dimensions of the columns, additional reinforcement systems with double headed studs often used. Another possibility is the use of structural steel shear heads integrated in the slab. The paper deals with the development of a new composite shear head system. Test results, Finite-Element studies and a simplified design model are presented for this new type of composite shear head system.