中文摘要：

目前,现行各国规范和典型抗剪模型未能准确、合理考虑尺寸效应对深受弯构件受剪能力的影响。基于拉压杆模型,结合断裂力学中能量损失平衡方程和裂缝带抗剪理论,建立了深受弯构件抗剪计算模型;通过对大量钢筋混凝土深受弯构件受剪试验数据的回归分析,对模型进行简化;采用该模型对343组深受弯构件的受剪承载力进行计算,并将其预测结果及美国ACI318-14、欧洲EC2、加拿大CSA A23.3-04、我国规范（GB50010-2010）、Tan-Cheng模型计算结果与试验值进行对比分析。分析表明：基于裂缝带理论的深受弯构件抗剪模型预测结果较各国规范及Tan-Cheng模型的计算结果与试验值吻合良好,建议模型具有明确的力学概念且受剪跨比影响较小,消除了尺寸效应的影响,能够准确预测深受弯构件的抗剪能力。

英文摘要：

Previous research has shown that the current specifications and typical shear models were failed to reasonably consider the size effect on shear bearing capacity of deep flexural members. This paper proposes a reasonable shear model for deep flexural members by combining an energy loss equilibrium equation in fracture mechanics with the crack band theory based on the strut-and-tie model. 343 reinforced concrete deep flexural members were collected and were used to simplify the proposed shear model. To determine the rationality of a simplified shear model, its calculation results and the predicted results obtained from ACI 318-14, EC2, CSA A23.3-04 and GB50010-2010 were compared with the test results. The comparison results show that the shear bearing capacity of deep flexural members predicted by the simplified shear model based on crack band theory is better than those determined from others current specifications and from Tan-Cheng model, and that also in a better agreement with the test results. Owing to the specific force transfer mechanisms and the less effect of shear span to a depth ratio, it is also concluded that this proposed model can reasonably consider the size effect of large members, and can accurately predict the shear bearing capacity of reinforced concrete deep flexural members.