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为了研究配筋率对混凝土断裂韧度、有效裂缝长度等断裂参数的影响,以及钢筋在混凝土裂缝扩展过程中的限裂作用,通过理论分析和钢筋混凝土断裂破坏特征,建立了钢筋混凝土双K断裂判据,在此基础上,设计制作了3组12根不同配筋率的三点弯曲梁试件,测得每个荷载-裂缝张口位移曲线(P-CMOD),研究了配筋率对钢筋混凝土3点弯曲梁试件断裂性能的影响。试验结果表明:钢筋混凝土试件的裂缝扩展过程也可以用双K断裂准则描述,起裂断裂韧度与配筋率无关,是材料的固有参数;失稳断裂韧度随配筋率的增大而逐渐增大;钢筋的存在还可以很好地抑制裂缝的扩展。
In order to study the effect of reinforcement ratio on the fracture parameters of concrete such as fracture toughness and effective crack length, as well as the crack-limiting effect of reinforcing steel during the crack propagation in concrete, theoretical analysis and failure characteristics of reinforced concrete were established. Based on this, three groups of three-point bending beam specimens with different reinforcement ratios were designed and manufactured, and the displacement-crack displacement curve (P-CMOD) of each load was measured. The effect of reinforcement ratio on reinforcement Effect of 3 - point Bending Specimen on Fracture Property of Concrete. The experimental results show that the crack propagation process of RC specimens can also be described by the double-K fracture criterion. The fracture toughness of the specimens is independent of the reinforcement ratio and is the intrinsic parameter of the material. The failure toughness of the specimens increases with the reinforcement ratio And gradually increased; the presence of steel can also be a good way to inhibit the expansion of cracks.