界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响研究

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发布时间：2020-01-06 00:00:00

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界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响研究

Study on the effect of interface defects on the flexural behavior of RC beams strengthened with CFRP

2024年第7期

CFRP加固；抗弯性能；界面剥离；界面缺陷；钢筋混凝土梁

CFRP reinforced; Flexural performance; Interfacial debonding; Interface defect; Reinforced concrete beam

2024年第7期

10.19761/j.1000-4637.2024.06.070.06

谈峰玲1，蒋宇杰2，*，周浩2，汪毅2

1.中国水利水电第八工程局有限公司，湖南长沙 410004；2.中南大学土木工程学院，湖南长沙 410075

谈峰玲1，蒋宇杰2，*，周浩2，汪毅2

谈峰玲,蒋宇杰,周浩,等.界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响研究[J].混凝土与水泥制品,2024(7):70-75.

TAN F L,JIANG Y J,ZHOU H,et al.Study on the effect of interface defects on the flexural behavior of RC beams strengthened with CFRP[J].China Concrete and Cement Products,2024(7):70-75.

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摘要：为研究界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响，制作了3根钢筋混凝土梁对比试件，并进行了四点弯曲试验。同时，采用ABAQUS分析软件建立了非线性有限元模型，并进行了数值模拟分析。结果表明：当存在多个不连续缺陷时，试件上的CFRP提前发生剥离，剥离荷载下降了20.77%，导致试件的破坏模式发生改变，虽然极限荷载仅降低2.46%，但挠度降幅高达15.37%，延性下降显著；界面缺陷附近易产生应力集中，促使多裂缝均衡发展，导致裂缝间距减小；界面缺陷影响CFRP剥离起始发生位置，更易引起CFRP沿试件宽度方向贯穿剥离。 Abstract: In order to study the interface defects on the flexural behavior of RC beams strengthened with CFRP, 3 comparative specimens were made and four-point bending tests were conducted. At the same time, a nonlinear finite element model was established by using ABAQUS software, and the numerical analysis was conducted. The results show that when there are multiple interface defects in the specimens, the CFRP debonding occurs in advance and the debonding load decreases by 20.77%, which leads to a change in the failure mode of the specimens. Although the ultimate load decreases by only 2.46%, the deflection decreases by 15.37% and the ductility decreases significantly. Stress concentration is easy to occur near the interface defects, forming the balanced development of multiple cracks, resulting in the reduction of crack spacing. The interface defect affects the initial location of CFRP stripping, which is more likely to cause CFRP stripping along the width direction to form penetration.

英文名 : Study on the effect of interface defects on the flexural behavior of RC beams strengthened with CFRP

刊期 : 2024年第7期

关键词 : CFRP加固；抗弯性能；界面剥离；界面缺陷；钢筋混凝土梁

Key words : CFRP reinforced; Flexural performance; Interfacial debonding; Interface defect; Reinforced concrete beam

刊期 : 2024年第7期

DOI : 10.19761/j.1000-4637.2024.06.070.06

文章编号 :

基金项目 :

作者 : 谈峰玲1，蒋宇杰2，*，周浩2，汪毅2

单位 : 1.中国水利水电第八工程局有限公司，湖南长沙 410004；2.中南大学土木工程学院，湖南长沙 410075

谈峰玲1，蒋宇杰2，*，周浩2，汪毅2

谈峰玲,蒋宇杰,周浩,等.界面缺陷对CFRP加固钢筋混凝土梁抗弯性能的影响研究[J].混凝土与水泥制品,2024(7):70-75.

TAN F L,JIANG Y J,ZHOU H,et al.Study on the effect of interface defects on the flexural behavior of RC beams strengthened with CFRP[J].China Concrete and Cement Products,2024(7):70-75.

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参考文献

引用本文

Abstract: In order to study the interface defects on the flexural behavior of RC beams strengthened with CFRP, 3 comparative specimens were made and four-point bending tests were conducted. At the same time, a nonlinear finite element model was established by using ABAQUS software, and the numerical analysis was conducted. The results show that when there are multiple interface defects in the specimens, the CFRP debonding occurs in advance and the debonding load decreases by 20.77%, which leads to a change in the failure mode of the specimens. Although the ultimate load decreases by only 2.46%, the deflection decreases by 15.37% and the ductility decreases significantly. Stress concentration is easy to occur near the interface defects, forming the balanced development of multiple cracks, resulting in the reduction of crack spacing. The interface defect affects the initial location of CFRP stripping, which is more likely to cause CFRP stripping along the width direction to form penetration.

关键词:

the

cfrp

缺陷

decreases

interface

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