RESEARCH ON THE SHEAR STRENGTH OF PRECAST STEEL REINFORCED CONCRETE BEAMS

To analyze the shear failure mechanism of precast steel reinforced concrete beams and put forward the corresponding calculation method, two full-scale precast steel reinforced concrete beams were tested under static four-point loading. The failure patterns, load-displacement curves and strain development were recorded to investigate the shear mechanism and strength of the specimens of different aspect ratios. On the basis of the test results, a set of calculation formulas based on the compatible truss-arch model and Nakamura model were proposed to predict the shear strength of both precast and conventional steel reinforced concrete beams. The comparison with the existing results of 75 shear-critical steel reinforced concrete beams shows that the proposed method can provide reasonable predictions of the shear strength, and the results calculated by the AISC 360-2010 model and JGJ 138-2016 model are relatively conservative.