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论文:2022,Vol:40,Issue(1):175-181 |
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引用本文： |
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谢浩, 孙晓彤, 门燕青, 黄永亮, 曹玉鑫. 基于内聚力模型的钢筋混凝土梁破坏机理研究[J]. 西北工业大学学报 |
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XIE Hao, SUN Xiaotong, MEN Yanqing, HUANG Yongliang, CAO Yuxin. Study on failure mechanism of reinforced concrete beam based on cohesive zone model[J]. Northwestern polytechnical university |
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| 基于内聚力模型的钢筋混凝土梁破坏机理研究 |
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| 谢浩1,2, 孙晓彤3, 门燕青1, 黄永亮1,2, 曹玉鑫1 |
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1. 济南轨道交通集团有限公司, 山东 济南 250014;
2. 山东大学 齐鲁交通学院, 山东 济南 250002;
3. 中国矿业大学(北京) 力学与建筑工程学院, 北京 100083 |
| 摘要: |
| 基于内聚力模型理论探讨钢筋混凝土梁在外荷载作用下断裂破坏的力学机制，对比分析钢筋混凝土梁原型实验与数值计算结果，研究钢筋混凝土梁在不同配筋率和螺旋箍筋倾角条件下，梁体裂纹的分布、扩展规律和破坏形式。研究结果表明：①内聚力模型模拟钢筋混凝土结构断裂破坏优势显著，能够再现梁体裂纹萌生、扩展和断裂破坏过程；②少量和超量配筋均会使钢筋混凝土梁表现出脆性破坏的特征，而配筋率适中则能充分发挥钢筋混凝土梁的延性特征，更加易于梁体承载；③螺旋箍筋倾角为80°时，梁体的正截面承载能力与斜截面承载能力均达到最大值。 |
| 关键词:
钢筋混凝土梁
内聚力模型
配筋率
螺旋箍筋
裂纹拓展
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| Study on failure mechanism of reinforced concrete beam based on cohesive zone model |
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| XIE Hao1,2, SUN Xiaotong3, MEN Yanqing1, HUANG Yongliang1,2, CAO Yuxin1 |
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1. Jinan Rail Transit Group Co., Ltd., Jinan 250014, China;
2. School of Qilu Transportation, Shandong University, Jinan 250002, China;
3. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China |
| Abstract: |
| The problem of crack propagation in reinforced concrete beams is common in practical engineering. It is very important to correctly describe the law of crack propagation, the mechanism of fracture failure and the internal stress and deformation characteristics of the beams. Based on cohesive zone mode, the mechanical mechanism of fracture failure of 3D reinforced concrete beams under external load is studied in this paper. By comparing the numerical simulation with the experimental results of the reinforced concrete beam, the crack distribution, expansion law and failure mode of the reinforced concrete beam under the conditions of different reinforcement ratio and spiral stirrup inclination angle are investigated. The results show that:①a small amount of reinforcement and a superfluous amount of reinforcement will make the reinforced concrete beam show the characteristics of brittle failure, while the moderate reinforcement ratio can give full play to the ductility of the reinforced concrete beam, which is easier to bear the load of the beam; ②when the inclination angle of spiral stirrup is about 80°, the bearing capacity of normal section and oblique section of the beam reach the maximum value. |
| Key words:
reinforced concrete beam
cohesive zone model
reinforcement ratio
spiral stirrup
crack expansion
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| 收稿日期: 2021-04-13
修回日期:
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| DOI: 10.1051/jnwpu/20224010175 |
| 基金项目: 山东省自然科学基金（ZR2020QE256，ZR2020ME243）资助 |
| 通讯作者: 孙晓彤(1992—),中国矿业大学(北京)博士研究生,主要从事隧道工程研究。e-mail:970227116@qq.com
Email：970227116@qq.com |
| 作者简介: 谢浩(1990—),济南轨道交通集团有限公司高级工程师,主要从事岩土及隧道工程稳定性评价研究。
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