基于DIC技术的钢筋混凝土梁剪切裂缝自动提取与量化方法  

AUTOMATION EXTRACTION AND QUANTIFICATION OF SHEAR CRACKS IN REINFORCED CONCRETE BEAMS BASED ON DIC TECHNOLOGY

作　　者：杨子涵 舒江鹏 杨静滢 李俊 白勇[1] YANG Zi-han;SHU Jiang-peng;YANG Jing-ying;LI Jun;BAI Yong(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,Zhejiang 310058,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058

出　　处：《工程力学》2024年第S01期187-196,共10页Engineering Mechanics

基　　金：国家重点研发计划“政府间国际科技创新合作”重点专项项目(2023YFE0115000);国家自然科学基金项目(52108179);浙江省领雁计划项目(2023C01161)。

摘　　要：针对钢筋混凝土梁实验中剪切斜裂缝的自动化定位、全域范围内各方向宽度量化及扩展追踪问题,该文提出一种基于数字图像相关技术(DIC)的裂缝自动提取与宽度量化的计算方法。由DIC计算得出的水平、竖直、剪切应变场来计算试件表面的主拉伸应变场,并将试件表面主应变大于某一阈值的部分视为开裂。对开裂部分进行形态学操作,提取出裂缝骨架线。在骨架线两侧定义裂缝运动参考点,根据参考点的运动来计算裂缝的发展规律。该计算方法实现了混凝土梁加载过程中任意方向上裂缝自动化检测及高精度量化,并且能够处理试件局部旋转的问题,充分了利用DIC测量技术的潜力。通过实验室内四组钢筋混凝土梁剪切实验验证该方法的有效性与精度。结果表明:该方法能够在多加载阶段实时追踪全域范围内各方向的裂缝开展并量化。To address the problems of automatic localization,width quantification in all directions and extended tracking of shear diagonal cracks in reinforced concrete beam experiments,this paper proposes a computational method for automatic crack extraction and width quantification based on digital image correlation(DIC)technology.The horizontal,vertical and shear strain fields calculated by DIC are used to calculate the principal tensile strain fields on specimen surface,and the part of the specimen surface where the principal strain is greater than a certain threshold value is considered as cracked.Morphological operations are performed on the cracked portion to extract the crack skeleton line.Reference points for crack movement are defined on both sides of the skeleton line,and the crack development pattern is calculated based on the movement of the reference points.The calculation method achieves automated detection and high accuracy quantification of cracks in any direction during the loading of concrete beams,and is able to handle local rotation of the specimen,leveraging the full potential of DIC measurement technique.The validity and accuracy of the method are verified through four sets of laboratory shear tests of reinforced concrete beams.The results show that the method is capable of tracking and quantifying the crack development in all directions over the full range in real time during multiple loading stages.

关 键 词：钢筋混凝土梁 剪切裂缝 数字图像相关 实时追踪量化 主应变场 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术] TU755.7[自动化与计算机技术—计算机科学与技术]