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基于CT及数字图像相关法的混凝土变形场测量分析

Measurement and Analysis of Concrete Deformation Field Based on CT and Digital Image Correlation Method

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摘要

采用动态加载仪和医用CT机对混凝土进行单轴原位压缩应力分层扫描,选取试件中部层面的CT图像作为对象,对混凝土的组成部分进行CT阈值划分,分析裂纹的产生及发展过程。利用数字图像相关(DIC)法测量混凝土内部的位移场及应变场,结合位移场与应变场分析变形局部化区域的产生及发展过程,得到高应变产生区域与CT图像的裂纹产生区域一致;结合CT值的平均值与最大主应变随应力的变化曲线,分析混凝土破坏过程的各阶段,得到CT尺度裂纹阶段开始于峰值荷载的70.3%处。实验结果表明,DIC法与先进的CT技术相结合的方法可以直观地以图像的形式对混凝土试件内部的应力应变过程进行呈现,为研究混凝土内部结构的变形、破坏和稳定性提供有效的可视化手段。

Abstract

A dynamic loading instrument and medical computed tomography (CT) machine are used to perform a single-axis in situ compressive stress-layered scan of a concrete. The CT image of the middle layer of the concrete specimen is selected as the object, and the concrete components are divided into CT thresholds to analyze the occurrence and development of cracks. The internal displacement and strain fields of the concrete are measured using the digital image correlation (DIC) method, and the displacement and strain fields are combined to analyze the generation and development process of the localized deformation area. The results reveal that the high-strain generation area is consistent with the crack generation area of the CT image. Combined with the CT value, the curve of the average value and maximum principal strain versus stress are analyzed. Moreover, the various stages of the concrete failure process are analyzed. The evaluation reveales that the CT-scale crack stage started at 70.3% of the peak load. Experimental results show that the combination of DIC method and advanced CT technology can present the stress and strain process inside the concrete specimen in the form of images, providing effective visualization for studying the deformation, failure, and stability of the internal structure of the concrete.

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中图分类号:TU528

DOI:10.3788/LOP57.200401

所属栏目:探测器

基金项目:国家自然科学基金、陕西省自然科学基金;

收稿日期:2019-12-24

修改稿日期:2020-01-17

网络出版日期:2020-10-01

作者单位    点击查看

王凡:西安建筑科技大学信息与控制工程学院, 陕西 西安 710055
赵亮:西安建筑科技大学信息与控制工程学院, 陕西 西安 710055西安建筑科技大学土木工程学院, 陕西 西安 710055
吴晓东:西安建筑科技大学信息与控制工程学院, 陕西 西安 710055
党发宁:西安理工大学土木与建筑工程学院, 陕西 西安 710048

联系人作者:赵亮(tanatee@163.com)

备注:国家自然科学基金、陕西省自然科学基金;

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引用该论文

Wang Fan,Zhao Liang,Wu Xiaodong,Dang Faning. Measurement and Analysis of Concrete Deformation Field Based on CT and Digital Image Correlation Method[J]. Laser & Optoelectronics Progress, 2020, 57(20): 200401

王凡,赵亮,吴晓东,党发宁. 基于CT及数字图像相关法的混凝土变形场测量分析[J]. 激光与光电子学进展, 2020, 57(20): 200401

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