徐晓良, 杨树桐. 钢筋混凝土少筋梁断裂特性试验研究[J]. 工程力学, 2017, 34(增刊): 239-243. DOI: 10.6052/j.issn.1000-4750.2016.03.S049
引用本文: 徐晓良, 杨树桐. 钢筋混凝土少筋梁断裂特性试验研究[J]. 工程力学, 2017, 34(增刊): 239-243. DOI: 10.6052/j.issn.1000-4750.2016.03.S049
XU Xiao-liang, YANG Shu-tong. EXPERIMENTAL STUDY ON FRACTURE BEHAVIOR OF LIGHTLY-REINFORCED CONCRETE BEAM[J]. Engineering Mechanics, 2017, 34(增刊): 239-243. DOI: 10.6052/j.issn.1000-4750.2016.03.S049
Citation: XU Xiao-liang, YANG Shu-tong. EXPERIMENTAL STUDY ON FRACTURE BEHAVIOR OF LIGHTLY-REINFORCED CONCRETE BEAM[J]. Engineering Mechanics, 2017, 34(增刊): 239-243. DOI: 10.6052/j.issn.1000-4750.2016.03.S049

钢筋混凝土少筋梁断裂特性试验研究

EXPERIMENTAL STUDY ON FRACTURE BEHAVIOR OF LIGHTLY-REINFORCED CONCRETE BEAM

  • 摘要: 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。

     

    Abstract: The whole fracture process was analyzed by three-point-bending tests on lightly-reinforced concrete beams with different initial notch lengths. The state of cracking initiation was determined experimentally. The mechanism of the first critical state in the load-displacement curve was discussed. Furthermore, a relative ratio of reinforcement is proposed based on comparison between the critical load and the load-carrying capacity of beams. Thus, the ultimate failure mechanism of lightly-reinforced concrete beams was analyzed and the Model I crack propagation of concrete under the bridging action of steel bar was determined.

     

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