Modelling and design method for static resistance of a new connection between steel tubular column and flat concrete slab

Abstract

This paper presents the results of a numerical and analytical investigation into the punching shear behaviour of an innovative simple and effective shear connection between steel tubular column and flat concrete slab using welded shear studs, steel plates and bent-up rebars. The finite element numerical simulation model was validated against two full-scale physical tests carried out by the authors. The validated numerical simulation model was used to perform extensive numerical parametric studies to investigate the effects of changing different design parameters including flat slab depth, concrete grade, bent-up rebar design, shear stud dimensions (length and diameter) and steel tube size, so as to develop thorough understanding of their punching shear behaviour and to provide comprehensive data for development of an analytical method for design. The developed analytical design method can be used to check capacities of shear studs, bent-up rebars and slab punching shear resistance. For this shear connection system, it is easy to prevent shear stud yield failure and bent-up rebar failure so that the system behaves as an enlarged column for calculating punching shear resistance of the slab. For the enlarged column, punching shear resistance calculation method in Eurocode 2 [2] can be used.