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该文通过不同初始缝长的钢筋混凝土少筋梁三点弯曲试验,对梁的断裂全过程进行了分析。确定了混凝土的起裂状态,并解释了荷载-位移全曲线中第一个临界状态产生的机理;结合第一个峰值与梁极限承载力的大小关系,提出了相对配筋率的概念,对少筋梁的最终破坏机理进行了分析,明确了钢筋约束条件下混凝土中I型裂缝的扩展规律。
In this paper, through the three-point bending test of the less-stressed reinforced concrete beam with different initial seam length, the whole process of the beam fracture is analyzed. The initiation state of concrete is determined, and the mechanism of the first critical state in the whole curve of load-displacement is explained. Based on the relationship between the first peak and the ultimate bearing capacity of the beam, the concept of relative reinforcement ratio The ultimate failure mechanism of the few tendons is analyzed, and the law of the type I crack propagation in concrete under the constraint of steel bars is defined.