基于DIC技术的钢筋混凝土梁损伤识别  

Damage Identification of Reinforced Concrete Beams Based on Digital Image Correlation Technology

作　　者：巩忠文 熊二刚[2] 胡勤斌 付重阳 王乃腾 GONG Zhongwen;XIONG Ergang;HU Qinbin;FU Chongyang;WANG Naiteng(School of Civil Engineering,Chang'an University,Xi'an 710061,China;Key Laboratory of Low-carbon Construction of Xi'an,Chang'an University,Xi'an 710061,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]长安大学西安市城镇低碳建设重点实验室,陕西西安710061

出　　处：《应用基础与工程科学学报》2023年第5期1229-1242,共14页Journal of Basic Science and Engineering

基　　金：国家自然科学基金青年项目(51808046);陕西省重点研发计划项目(2021SF-461);中央高校基本科研业务费专项资金资助项目(300102282502)。

摘　　要：为研究钢筋混凝土梁基于数字图像相关技术(Digital Image Correlation, DIC)的损伤识别,设计了4组不同剪跨比的钢筋混凝土梁构件,并在构件表面采用人工制作散斑图;采用DIC技术测量梁全跨长的竖向位移,同时采用传统位移计和激光位移计测量梁跨中的竖向位移;采用格林函数、第一类Fredholm积分以及正则化数值解的数学算法,建立了梁构件在荷载作用下弯曲刚度分布的损伤识别方程.基于DIC技术测量的试验梁荷载-挠度位移曲线,识别了不同荷载下混凝土梁的刚度损伤情况.研究结果表明:DIC技术测量与传统位移测量得到的位移曲线基本一致,误差在可接受范围以内;建立的损伤识别方程对梁的刚度识别精度较高.To study the damage identification of reinforced concrete beams based on the digital image correlation(DIC)technology,four groups of reinforced concrete beams with different shear span ratios were designed,and the speckle patterns were artificially painted on the surface of the beams;The vertical displacement of the whole span of the beams was measured by DIC technology,and meanwhile the vertical displacement at the mid-span of beams was obtained by the traditional displacement meter and laser displacement meter.The damage identification equation of the bending stiffness distribution was established for RC beams subject to loads,by the utilization of the Green's function,the first kind of Fredholm integral and the mathematical algorithm of regularized numerical solution.According to the load-displacement curve of the test beams measured by DIC technology,the stiffness damage of the concrete beams under different loads was identified.The research results show that:the measurement of DIC technology is basically consistent with the displacement curve obtained by the traditional displacement measurement,and the error is acceptable;the damage identification equation developed herein can permit an accurate identification of the stiffness for the beams.

关 键 词：数字图像相关技术 剪跨比 散斑图 逆分析程序 弯曲刚度分布 损伤识别 模拟试验 

分 类 号：TU375.1[建筑科学—结构工程]