ABSTRACT
This paper presents the results of experiments on deep trapezoidal slabs acting as secondary beams in composite steel/concrete floors using fibre reinforced concrete. Because of the voids in the slabs near the location of the stud shear connectors, many designers feel that the strength and ductility of the shear connection is compromised. Previous recent tests on deep trapezoidal slabs with plain concrete have shown this is not the case. The reason for using fibre reinforced concrete is to possibly further enhance the ductility and strength of the shear connection region in the slab, and this paper considers push tests in a pilot testing procedure to determine the optimum fibre dosage prior to embarking on detailed push tests and full-scale beam testing. The horizontal push-testing methodology is explained first, and results are then provided for six slabs with Dramix RC-65/60-BN nominal steel fibre dosages of 20, 40 and 60 kg/m3, each with and without conventional transverse reinforcement. Based on the test results reported herein, conclusions are drawn on the strength and ductility advantages accruing to the use of fibre reinforced concrete.
