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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

王舒扬, 谢桂华, 轩元, 等. 基于CFRP自传感的受压结构智能监测研究与应用[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 王舒扬, 谢桂华, 轩元, 等. 基于CFRP自传感的受压结构智能监测研究与应用[J]. 复合材料学报, 2024, 42(0): 1-10.
WANG Shuyang, XIE Guihua, XUAN Yuan, et al. Study and application of smart monitoring on compressed structures based on CFRP self-sensing[J]. Acta Materiae Compositae Sinica.
Citation: WANG Shuyang, XIE Guihua, XUAN Yuan, et al. Study and application of smart monitoring on compressed structures based on CFRP self-sensing[J]. Acta Materiae Compositae Sinica.

基于CFRP自传感的受压结构智能监测研究与应用

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

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

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

     

  • 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

    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

    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

    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

    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

    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]

    图  7  底层墙体监测区域

    Figure  7.  Ground floor wall monitoring area

    图  8  现场监测与分析

    Figure  8.  On-site monitoring and analysis

    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)

    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)

    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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  • 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

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