基于DIC技术的预制混凝土剪力墙反力架静载实验应变研究  

Experimental strain study of precast concrete shear wall reaction frame based on DIC technique

作　　者：蒋国平[1] 肖三霞[1] 郭金龙 温小栋[2] 纪晟晖 JIANG Guoping;XIAO Sanxia;GUO Jinlong;WEN Xiaodong;JI Shenghui(Fujian Jiangxia University,Fuzhou 350108,China;Ningbo Key Laboratoiy foe Concrete Structure DurabiOty,Ningbo University of Technology,Ningbo 315016,China;Fujian Agriculture and Forestry University,Fuzhou 350108,China)

机构地区：[1]福建江夏学院,福建福州350108 [2]宁波工程学院宁波市混凝土结构耐久性重点实验室,浙江宁波315016 [3]福建农林大学,福建福州350108

出　　处：《铁道科学与工程学报》2022年第8期2381-2387,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51569035);福建省自然科学基金资助项目(2019J01884,2019J01885)。

摘　　要：数字图像相关(DIC)技术已在建筑领域得到推广应用,其中光照情况是影响DIC技术分析结果的因素之一。对于较大型的建筑结构而言,光强度分布普遍存在不均匀现象。如果不考虑光强对测量与计算结果的影响,将可能导致DIC技术测量结果存在较大误差。为了考虑不均匀光强的影响,基于光强鲁棒性的DIC测量方法将光强在位移计算窗口内视为线性变化,以此推导光强的计算公式、光强的分布情况,进而修正传统DIC技术的分析结果。通过数值模拟方法,利用散斑生成算法模拟一组具有光照影响的散斑图,将基于光强鲁棒性的DIC技术与传统DIC技术进行位移和应变计算对比。对比结果显示前者解决了传统DIC技术存在的数据波动、应变云图色彩分布不均、数据分布离散度高的问题,基于光强鲁棒性的DIC技术的可靠性得到验证。将基于光强鲁棒性的DIC技术应用于预制混凝土剪力墙反力架静载实验,分析得到了预制混凝土剪力墙试件的应变云图和裂纹扩展路径,相比数值模拟方法所得的结果,基于光强鲁棒性的DIC技术分析结果为直接测量所得,分析结果更为合理可信,进一步验证了基于光强鲁棒性的DIC技术的可靠性。Digital image correlation(DIC)technology has been widely used in the field of architecture,in which lighting is one of the factors that affect the analysis results of DIC technology.For larger building structures,the light intensity distribution is generally uneven.If the influence of light intensity on the measurement and calculation results is not considered,it may lead to a large error in the measurement results of DIC technology.In order to consider the influence of uneven light intensity,the DIC measurement method based on light intensity robustness regards the light intensity as a linear change in the displacement calculation window,deduces the calculation formula and the distribution of light intensity,and then modifies the analysis results of the traditional DIC technology.Through the numerical simulation method,the speckle generation algorithm is used to simulate a group of speckle patterns with the influence of light,and the DIC technology based on light intensity robustness is compared with the traditional DIC technology for the calculation of the displacement and strain.The comparison results show that the former solves the problems of data fluctuation,uneven color distribution of strain cloud image and high discreteness of data distribution in traditional DIC technology,and the reliability of DIC technology based on light intensity robustness is verified.The DIC technology based on light intensity robustness is applied to the static load experiment of precast concrete shear wall reaction frame,and the strain cloud diagram and crack propagation path of precast concrete shear wall specimens are analyzed.Compared with the results obtained by numerical simulation method,the results of DIC technology based on light intensity robustness are measured directly,and the results are more reasonable and reliable,which further verifies the reliability of DIC technology based on light intensity robustness.

关 键 词：数字图像 预制构件 混凝土剪力墙 光强 误差 

分 类 号：O39[理学—工程力学]