作者：刘茂钊¹, 杨博¹, 杨英武²

作者单位：1. 浙江理工大学建筑工程学院, 浙江 杭州 310018;
2. 浙江农林大学风景园林与建筑学院, 浙江 杭州 311300

关键词：粘钢加固混凝土结构;粘结缺陷识别;电磁感应;涡流生热;红外热像法

摘要：

目前，有关粘钢加固混凝土结构的粘结层缺陷识别研究还不充分，识别小尺寸和复杂缺陷更是困难。该文首先讨论影响粘钢加固的粘结层缺陷识别主要因素；然后分析利用电磁涡流激励方法及涡流趋肤效应快速提升钢板表层温度的可行性；最后进行粘钢法加固构件的粘结层缺陷试验，通过设计专门电磁感应涡流装置实现钢板表层温度短时自室温升至大约373 K(100 ℃)，粘钢加固构件复合层因内外温差而实现内部热传导，同时利用热像仪单面法采集钢板表面温度随时间变化的连续热像。最终，通过时间序列热像减法运算减小热激励不均匀及层内热传导影响，识别出直径10~20 mm的粘结层缺陷。该方法可初步用于粘钢加固钢筋混凝土结构的粘结层施工质量或服役结构的粘结层工作状态评价。

Experimental study on defects detection in bonding layer of steel plate bonded RC structure by thermal image based on electromagnetic eddy current thermal excitation
LIU Maozhao¹, YANG Bo¹, YANG Yingwu²
1. College of Architectural Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China;
2. College of Landscape Architecture and Architecture, Zhejiang A&F University, Hangzhou 311300, China
Abstract: At present, researches on the bonding layer defects detection of concrete structure strengthened by bonded steel plate are not enough, especially for small size and complex defects. Based on the analysis of construction process of steel plate bonded RC structure project, the feasibility are discussed to use electromagnetic eddy current excitation method and skin effect to improve the surface temperature of steel plate quickly. With the different size of defects in the bonding layer experiments, a special electromagnetic induction device is designed to rise the temperature of the surface of steel plate from room temperature to 373 K (100℃) approximately in a short time. Internal heat conduction of the composite layers of the reinforced structure due to the internal and external temperature difference can be induced. At the same time, the continuous thermal image of the surface temperature of the steel plate is collected by using the single-sided method with the thermal imager. Finally, the defects of the bonding layer with diameter of 10 mm to 20 mm were detected by subtracting time series thermal images to reduce the influence of the uneven thermal excitations. The method proposed can be used to evaluate the construction quality or the working condition of bonding layer defects of RC structures strengthened with bonded steel initially.
Keywords: RC structure with bonded steel plate;defects detection in bonding layer;electromagnetic induction;heat generation by eddy current;infrared thermography
2023, 49(5):52-59  收稿日期: 2021-07-08;收到修改稿日期: 2021-09-14
基金项目: 浙江省基础公益研究计划项目（LGG20E080002）
作者简介: 刘茂钊(1997-),男,浙江衢州市人,硕士研究生,专业方向为结构振动分析与检测加固
参考文献
[1] 袁红梅. 粘结结构界面缺陷超声检测技术及其应用研究[D]. 北京: 北京工业大学, 2010.
[2] 宋福春, 赵洁, 付东华. 冲击弹性波法检测钢板加固混凝土质量试验研究[J]. 建筑结构, 2018, 8(15): 84-88
[3] 黄沛, 谢慧才, 袁昕. 混凝土构件粘钢补强质量的红外热像检测方法[J]. 激光与红外, 2004, 34(5): 350-353
[4] REYNOLDS W N. Thermographic methods applied to industrial materials[J]. Canadian Journal of Physics, 1986, 64(9): 1150-1154
[5] TASHAN J, AL-MAHAIDI R, MAMKAK A. Defect size measurement and far distance infrared detection in CFRP-concrete and CFRP-steel systems[J]. Australian Journal of Structural Engineering, 2016, 17(1): 2-13
[6] 杨英武, 张欣, 杨小青, 等. 红外热像法识别混凝土结构粘钢加固缺陷的试验研究[J]. 低温建筑, 2018, 40(5): 21-27
[7] 罗元丰, 杨英武, 王茜茜, 等. 红外热像法识别粘钢法加固混凝土结构空鼓缺陷研究[J]. 宁波大学学报(理工版), 2019, 32(2): 1-4
[8] SADEGHIPOUR K, DOPKIN J A, LI K. A computer aided finite element/experimental analysis of induction heating process of steel[J]. Computers in Industry, 1996, 28(3): 195-205
[9] 曾金晶, 仪向向, 杨随先. 热成像无损检测技术比较研究[J]. 中国测试, 2015, 41(2): 5-10
[10] 王勇勇, 孙全德, 王恪典, 等. 角焊缝表面裂纹的涡流热成像检测研究[J]. 中国测试, 2021, 47(5): 11-15
[11] 杨世铭, 陶文铨. 传热学[M]. 4版. 北京: 高等教育出版社, 2006: 365-370.
[12] SIEGEL R, HOWELL J R. Thermal radiation heat transfer[M]. Hemisphere, 1981: 187–197.
[13] 于坤, 刘玉芳, 贾光瑞, 等. 影响钢表面红外光谱发射率的因素分析[J]. 红外技术, 2011, 33(5): 289-292
[14] 张飞麟. 几种常用钢材的光谱发射率特性研究[D]. 新乡: 河南师范大学, 2017.