建筑外墙饰面层粘结质量红外热像无损检测研究

发布时间：2018-05-18 05:39

本文选题：红外热像技术 + 建筑外墙饰面层　；参考：《武汉大学》2014年博士论文

【摘要】：建筑外墙饰面层的检测对预防饰面层脱落、保障人民的生命财产安全具有十分重要的意义。与传统的检测方法(目测法、锤击法、拉拔法等)相比,红外热像技术具有非接触、远距离、快速、大面积检测、结果直观等优点,为现代无损检测技术注入了新的活力,在建筑外墙饰面粘贴质量检测方面具有广阔的应用前景。但红外热像技术在我国建筑外墙饰面层粘结质量检测中的应用起步较晚、实际案例较少,目前主要处于定性化分析阶段,尚缺乏定量化分析方法。本文在甘肃省科技支撑计划项目(编号：1104GKCA053)的资助下,开展红外热像技术检测建筑外墙饰面层粘结质量的研究,主要工作及成果如下： (1)考虑饰面层颜色、内部缺陷的面积及厚度等因素,分别设计制作5组20个室内空鼓试件以及3组24个室外空鼓试件,进行红外热像技术检测面砖饰面层内部缺陷的室内与室外试验研究。结果表明：红外热像技术检测效果受热源激励方式、缺陷大小、饰面层颜色、红外热像仪竖向拍摄角度以及发射率等因素的影响,且饰面层表面温度沿内部缺陷宽度方向呈规律性变化,为红外热像技术检测饰面层内部缺陷面积的定量化分析提供了依据。 (2)基于试验结果,利用MATLAB图像处理技术及像素分析方法,开展红外热像技术检测建筑外墙饰面层内部缺陷面积的定量化分析研究。结果表明：MATLAB的图像处理工具箱能对建筑外墙饰面层的红外热像图进行有效的数字化处理；沿内部缺陷宽度方向的饰面层表面温差-位置曲线形状与缺陷宽度相关；建立的内部缺陷面积估算公式为红外热像检测技术的相关研究及实际工程应用提供参考。 (3)利用ABAQUS有限元软件的用户子程序接口功能,并考虑风速及日太阳辐射总量等因素对实际环境条件下的饰面层表面温度进行模拟分析。结果表明：基于ABAQUS有限元软件的用户子程序接口功能可对饰面层表面温度在实际环境下的变化规律进行有效模拟；饰面层表面温度在一天内呈阶段性变化；在升温阶段,缺陷位置中心点处饰面层的表面温度与环境温度相关；饰面层的表面温度受风速及日太阳辐射总量的影响,为红外热像技术检测建筑外墙饰面层粘结质量的实际环境的选择提供参考。 (4)在试验研究的基础上,结合有限元分析结果,制订了红外热像技术检测建筑外墙饰面层粘结质量的检测流程,开展了实际工程的红外热像技术检测,达到了预期的检测效果,为红外热像技术的应用起到了良好的推动作用。最后,在总结全文工作的基础上,提出了本课题的研究展望。
[Abstract]:The detection of exterior wall veneer layer is very important to prevent the decor layer from falling off and to ensure the safety of people's life and property. Compared with traditional testing methods (visual test, hammering, drawing, etc.), infrared thermal imaging technology has the advantages of non-contact, long distance, fast, large area detection, visual results, etc., which has injected new vitality for modern nondestructive testing technology. It has a broad application prospect in quality inspection of exterior wall veneer. However, the application of infrared thermal imaging technology in the inspection of the bonding quality of exterior wall veneer layer in our country is late, and the actual cases are less. At present, it is mainly in the stage of qualitative analysis and lacks of quantitative analysis method. In this paper, supported by Gansu Province Science and Technology support Project (No.: 1104GKCA053), the infrared thermal image technology is used to test the bonding quality of exterior wall facing layer. The main work and results are as follows: 1) considering the color of the finishing layer, the area and thickness of the interior defects, 5 groups of 20 indoor empty drum specimens and 3 groups of 24 outdoor empty drum specimens were designed and made. The indoor and outdoor experiments were carried out to detect the inner defects of the finishing layer of brick by infrared thermography. The results show that the effect of infrared thermal imaging technology is affected by the excitation mode of heat source, the size of defects, the color of finishing layer, the vertical shooting angle and emissivity of infrared thermal imager, etc. The surface temperature of the decorative layer changes regularly along the width of the inner defect, which provides a basis for the quantitative analysis of the inner defect area of the decorative layer by infrared thermal imaging. 2) based on the experimental results, using MATLAB image processing technology and pixel analysis method, the quantitative analysis of the inner defect area of exterior wall decoration layer is carried out by using infrared thermal image technology. The results show that the image processing toolbox of W MATLAB can effectively digitize the infrared thermal image of the exterior wall veneer layer, and the shape of the surface temperature difference and position curve along the direction of the inner defect width is related to the defect width. The internal defect area estimation formula provides a reference for the research and practical engineering application of infrared thermal image detection technology. Using the user subroutine interface function of ABAQUS finite element software and considering the wind speed and the total amount of solar radiation, the surface temperature of the decorative layer in the actual environment is simulated and analyzed. The results show that the interface function of user subroutine based on ABAQUS finite element software can effectively simulate the variation of the surface temperature of the veneer layer in the actual environment, the surface temperature of the veneer layer changes in a phase in one day, and in the stage of heating up, The surface temperature of the veneer at the center of the defect is related to the ambient temperature, and the surface temperature of the veneer is affected by the wind speed and the total solar radiation. It provides a reference for the selection of the actual environment for the inspection of the bonding quality of the exterior wall veneering layer by the infrared thermal imaging technology. 4) based on the experimental research and the results of finite element analysis, the detection flow of infrared thermal image technology for detecting the bonding quality of exterior wall veneering layer of building has been established, and the infrared thermal image technology detection of actual engineering has been carried out, which has achieved the expected detection effect. It has played a good role in promoting the application of infrared thermal imaging technology. Finally, on the basis of summing up the whole paper, the research prospect of this topic is put forward.
【学位授予单位】：武汉大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU746.2;TU767

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