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为深入了解配筋率对钢筋混凝土断裂韧度的影响,制作了3组12根带预制裂缝的钢筋混凝土三点弯曲梁并做了断裂试验,根据试验导出了钢筋混凝土三点弯曲梁试件断裂参数解析计算公式,分析了不同配筋率对钢筋混凝土三点弯曲梁断裂韧度的影响程度。结果表明,钢筋混凝土三点弯曲梁试件的开裂荷载主要由混凝土主体结构所决定,最大荷载主要由混凝土内部配置的钢筋情况所决定;裂缝亚临界扩展相对值随着配筋率的增加呈线性增加;配筋率的变化对失稳断裂韧度有一定影响,但对起裂断裂韧度影响不大;配筋率的增加,可有效提高试件的韧性和抵抗失稳破坏的能力。
In order to understand the effect of reinforcement ratio on the fracture toughness of reinforced concrete, three groups of 12 reinforced concrete three-point bending beams with prefabricated cracks were made and the fracture test was done. According to the experiment, the fracture of the three-point bending beam of reinforced concrete Parameter analysis and calculation formula, the influence of different reinforcement ratio on the fracture toughness of reinforced concrete three-point bending beam is analyzed. The results show that the cracking load of the three-point RC beam specimens is mainly determined by the main structure of the concrete. The maximum load is mainly determined by the condition of the reinforcing bars arranged inside the concrete. The relative value of the sub-critical crack propagation is linear with the increase of the reinforcement ratio Increase; the change of reinforcement ratio has a certain influence on the instability fracture toughness, but has little effect on the fracture toughness of the initiation fracture; the increase of the reinforcement ratio can effectively improve the toughness of the specimen and the ability to resist the destabilization failure.