基于CFRP自传感的受压结构智能监测研究与应用

王舒扬; 谢桂华; 轩元; 冒鹏飞; 伏纯宇; 苗永红

基于CFRP自传感的受压结构智能监测研究与应用

1.
江苏大学　土木工程与力学学院, 镇江 212013
2.
房屋安全抗震和技术指导中心镇江 212013
3.
镇江国投置业开发有限公司, 镇江212013

基金项目: 江苏大学第22批大学生科研课题立项资助项目(项目编号22A394)

详细信息

通讯作者:
谢桂华，博士，副教授，硕士生导师。研究方向：复合材料与复合结构。　E-mail: xgh2007@ujs.edu.cn

中图分类号: TU599;TB332
计量
- 文章访问数: 44
- HTML全文浏览量: 14
- 被引次数: 0
出版历程
- 收稿日期: 2024-04-09
- 修回日期: 2024-06-14
- 录用日期: 2024-06-24
- 网络出版日期: 2024-07-05

Study and application of smart monitoring on compressed structures based on CFRP self-sensing

1.
Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China
2.
Center for Seismic Resistance and Technical Guidance on Housing Safety, Zhenjiang 212013, China
3.
Zhenjiang Guotou Real Estate Development CO., LTD., Zhenjiang 212013, China

Funds: The 22nd batch of undergraduate research projects funded by Jiangsu University ( No. 22A394 )

摘要

摘要: 本文探索了基于碳纤维增强聚合物基复合材料(CFRP)智能特性的受压构件健康监测新方法。将CFRP智能带以不同角度黏贴在轴向受压混凝土柱的侧面，研究准静态单调压缩和循环压缩作用下不同偏轴角的智能带的电阻响应特征。结果表明，CFRP智能带在单调加载全过程中的电阻与被监测结构的阶段化变化相关，经历了初期的缓慢变化、中期的快速变化和结构失效时的急剧变化，直至结构失效后电阻部分恢复；循环荷载作用下电阻呈周期性变化，且大部分电阻变化可以恢复，仅有少量不可恢复电阻产生于首次循环加载阶段。此外，偏轴角$ \mathrm{\;\beta } $对电阻响应具有重要影响：$ \mathrm{\;\beta } $=0°与90°时智能带分别呈现负压阻效应和正压阻效应，而45°偏轴角时智能带分阶段出现不同的压阻效应，且电阻变化幅度相对较小。工程应用实践结果验证了上述CFRP智能带在结构监测中的可行性和有效性。
- 碳纤维 /
- 结构健康监测 /
- 压阻效应 /
- 偏轴角 /
- 轴向压缩
Abstract: A novel approach to structural health monitoring of compressed structures leveraging the intelligent properties of carbon fiber Reinforced Polymer (CFRP) was investigated. Smart CFRP strips were attached to the side surfaces of the axially compressed concrete column at various angles, and the electrical resistance of these strips under both monotonic and cyclic compression at different off-axial angles were analyzed. The findings reveal that the resistance of smart CFRP strips throughout the entire monotonic loading process correlates with the changes of the monitored structure, undergoing initial gradual changes, rapid changes at middle stage, and a sharp change upon the structural failure. The resistance changes partly reverse after failure. Under cyclic loading, the resistance shows periodic variations, with the resistance changes primarily being reversible, except for a small amount of irreversible resistance that occurs during the first loading cycle. Additionally, the off-axial angle, $ \mathrm{\;\beta } $, significantly influences the resistance response. At $ \mathrm{\;\beta } $=0° and $ \mathrm{\;\beta } $=90°, the smart strips exhibit negative and positive piezoresistive effects, respectively; while at $ \mathrm{\;\beta } $=45°, they display various piezoresistive effects in different phases, with a smaller change in resistance. The practical application results confirm the applicability and efficiency of the smart CFRP strips in structural monitoring.
- carbon fiber /
- structural health monitoring /
- piezoresistive effect /
- off-axial angle /
- axial compression

HTML全文

图 1 CFRP智能带布置与试件加载: (a) 智能带布置图 (单位: mm);(b) 试件加载图

Figure 1. CFRP strips arrangement and specimen loading: (a) Strips layout (unit: mm); (b) Specimen loading

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图 2 柱失效后的智能带及所在混凝土基体状态

Figure 2. States of sensing strips and their substrate after column failure

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图 3 单调压缩作用下的全过程监测结果: (a) G11；(b) G12；(c) G21；(d) G22；(e) G31

Figure 3. Full-range monitoring results under monotonic compressive loading: (a) G11; (b) G12; (c) G21; (d) G22; (e) G31

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图 4 循环荷载作用下的监测结果: (a) G11；(b) G12；(c) G21；(d) G22；(e) G31；(f) G32

Figure 4. Monitoring results under cyclic loading: (a) G11; (b) G12; (c) G21; (d) G22; (e) G31;(f) G32

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图 5 加载前后CFRP智能带的电镜扫描图: (a) 加载前; (b) 加载后

Figure 5. Scanning electron micrograph of CFRP strip before and after loading: (a) Before loading; (b) After loading

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图 6 环氧树脂基复合材料的接触电阻率和应力随时间的变化^[12]

Figure 6. Variation of contact resistivity and stress with time for epoxy resin matrix composites^[12]

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图 7 底层墙体监测区域

Figure 7. Ground floor wall monitoring area

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图 8 现场监测与分析

Figure 8. On-site monitoring and analysis

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图 9 嵌缝中CFRP带的电阻变化：(a) 监测点A1(横墙)；(b) 监测点A2(横墙)；(c) 监测点A3(纵墙)；(d) 监测点A4(纵墙)

Figure 9. Fractional change in electrical resistance of CFRP strips in caulked joints: (a) Monitoring point A1 (transverse wall); (b) Monitoring point A2 (transverse wall); (c) Monitoring point A3 (longitudinal wall); (d) Monitoring point A4 (longitudinal wall)

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图 10 延性混凝土表面CFRP带的电阻变化：(a) 监测点B1(横墙)；(b) 监测点B2(横墙)；(c) 监测点B3(纵墙)；(d) 监测点B4(纵墙)

Figure 10. Fractional change in electrical resistance of CFRP strips on concrete substrate: (a) Monitoring point B1 (transverse wall); (b) Monitoring point B2 (transverse wall); (c) Monitoring point B3 (longitudinal wall); (d) Monitoring point B4 (longitudinal wall)

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表 1 碳纤维增强聚合物基复合材料(CFRP)智能带分组详情

Table 1. Details of smart carbon fiber Reinforced Polymer (CFRP) strips

Group Number Dimension/mm³ Angle/(°)

G1 G11 90×10×1 0

G12 90×10×1 0

G2 G21 90×10×1 45

G22 90×10×1 45

G3 G31 90×10×1 90

G32 90×10×1 90

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