The applications of pre-cast concrete in flat-slabs are mainly guided by the construction joint between the slab elements and column in order to satisfy their monolithic action. This paper introduces a conceptual approach for the construction detail design of this joint. Therefore, an experimental program was conducted for testing the casting joint between two pre-cast cantilever slabs and a rectangular column. At the casting joint, the slabs and column loop reinforcement were arranged in a staggered overlapped manner. The tested specimens are loaded asymmetrically under bending, in order to study the moment transfer efficiency and the rotational stiffness of the joint from zero load up to failure. Different variables were studied, i.e. the slab reinforcement percentage and distribution, the curvature shape of the column loop reinforcement and the arrangement of shear stud rails. The behaviour of those construction joints were compared with that of ordinary monolithic flat slab/column joint to evaluate their cracking and deformational behaviour in SLS and their ultimate capacities in ULS. Additionally, the structural behaviour of those joints was analyzed using Strut and Tie Method. Strut and Tie Models (STM) were developed for  prediction of their ultimate loads. The validity of those STM was proven through a comparison with test results.

Keywords: pre-cast concrete, experimental, slab/columns joints, design, STM.