Shear Behaviour of Reinforced-Concrete Circular-Beams Without Web-Reinforcement

Abstract

In the current assay, the outcomes of a numerical analysis and an experimental program to investigate the effect of bar type on the behaviour of three full scale circular reinforced-concrete (RC) beams, subjected to shear-load, are presented. One beam was reinforced with conventional steel bars, one with sand-coated GFRP bars, and one with sand-coated CFRP bars. The beams had a length of 3000 mm and a diameter of 500 mm. The beams were subjected to two-points shear force, at a constant rate of 0.6 mm/min. All beams failed in diagonal tensions failure. The test results showed that, the beams reinforced with sand-coated GFRP and CFRP bars had 73 and 80% capacity, respectively, compared to the steel reinforced one. Finite element models (FEM) were built to imitate and investigate the shear behaviour of those beams. The accuracy of the FE prototypes was checked with the outcomes of the beams that were tested and experimentally. The results of the FE prototypes exhibited that, the fabricated models were able to prognosticate the conduct of the members, tested experimentally, with good accuracy. The average value of the shear capacity obtained experimentally to the shear strength obtained by the FE model, (V_exp/V_Model) for the prototypes, is 1.04 ± 0.02 with 2% COV.