预制装配型钢混凝土梁受剪承载力试验与计算方法研究

为了深入研究预制装配型钢混凝土梁的受剪机理并提出可准确预测其受剪承载力的计算公式，该文完成了2个足尺预制装配型钢混凝土梁试件的静力剪切性能试验。通过分析试件的破坏过程、荷载-位移曲线和应变发展规律，对不同剪跨比下试件的破坏形态和承载能力进行了研究。基于变形协调桁架-拱模型和Nakamura模型建立了该种预制装配型钢混凝土梁及普通现浇型钢混凝土梁共同适用的受剪承载力计算模型。通过与75个发生剪切破坏的型钢混凝土梁试验结果对比可得:该文提出的计算方法可较好反映型钢混凝土梁的剪切破坏机理，试验值与计算值吻合良好；规范AISC 360-2010和JGJ 138-2016建议的受剪承载力计算公式较为保守。

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.