型钢混凝土空腹叠合梁受剪承载力试验研究

为更加深入研究型钢混凝土叠合梁的受剪机理，提出更为优化的截面形式，该文完成了10个足尺型钢混凝土叠合梁在单调集中荷载作用下的静力试验研究。通过考察剪跨比、截面形式（空腹和实腹）等参数对受剪性能的影响，着重研究了足尺型钢混凝土空腹叠合梁的受剪性能。结合试验结果对各试件的裂缝形态、破坏特征、承载能力、变形等性能进行了分析研究。采用桁架-拱模型并基于变形协调条件将桁架、拱和型钢三者对受剪承载力的作用相结合，建立了适用于型钢混凝土叠合梁的受剪承载力计算方法。结果表明：型钢混凝土空腹叠合梁与实腹叠合梁具有相似的受剪性能和破坏形态，承载力随剪跨比的增大而减小，试件整体性良好；采用JGJ 2016和YB 9082-2006计算的受剪承载力离散型偏大，该文建立的修正桁架-拱模型计算值与试验结果吻合较好。

EXPERIMENT STUDY ON THE SHEAR CAPACITY OF STEEL REINFORCED CONCRETE HOLLOW COMPOSITE BEAMS

In order to investigate the shear mechanism of steel reinforced concrete composite beams and further optimize their section shapes, a static experiment with ten full-scaled specimens was carried out. The developments of strain, crack propagation, failure mode, deformation and shear capacity were thoroughly explored and the effects of aspect ratio and section shape(solid and hollow) were critically examined. On the basis of the test results, a proposed truss-arch model, which takes the compatibility of a truss, an arch and steel shape into account, was applied to establish the calculation method for the shear capacity of steel reinforced concrete hollow composite beams. The results indicated that: the specimens with solid section and hollow section both suffered similar failure modes and exhibited similar shear bearing capacities, and the shear bearing capacity decreased with the increase of the aspect ratio. The shear capacity calculated by the JGJ 138-2016 and YB9082-2006 shows high discreteness. The shear strengths obtained by the proposed method(compatible truss-arch model) agreed well with those from the experiment.