EXPERIMENTAL STUDY ON THE SHEAR CAPACITY OF SRHSHPC BEAMS

Based on a shear experiment of 10 SRHSHPC (steel reinforced high-strength and high-performance concrete) simply supported beam specimens, this paper reveals the main factors which affect the beam’s shear behaviors and obtains the relationship between the shear bearing capacity and the shear span ratio, concrete strength, steel ratio, stirrup ratio, flange width ratio (the ratio of steel flange width and beam width) and loading modes. According to the existing shear calculation methods of SRC beams, and adopting a truss-arch model for SRC beam member, the shear mechanism of SRHSHPC beams is analyzed, then it is concluded that the diagonal shear bearing capacity of SRHSHPC beams is composed of three parts: the effect of stirrup, concrete and steel web. This paper regresses the resistance coefficients of each part and offers calculating formulas for the diagonal shear bearing capacity of SRHSHPC beams. The calculation results agree well with the test conclusions and it is shown that the proposed formulas own high accurateness and can objectively reflect the shear behaviors of SRHSHPC beams. The research achievements will provide a theoretical support for the design calculation and engineering application of SRHSHPC beams.