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。
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.
出处
《工程力学》
EI
CSCD
北大核心
2017年第B06期239-243,共5页
Engineering Mechanics
基金
国家自然科学基金项目(51378481)
关键词
钢筋混凝土少筋梁
断裂全过程
起裂状态
相对配筋率
临界状态
lightly-reinforced concrete beam
whole fracture process
state of cracking initiation
relative ratio of reinforcement
critical state
