零差法与走时层析成像相结合的混凝土缺陷成像  

Travel Time Tomography of Concrete Defects Based on Piezoelectric Ceramic Zero-difference and Second-order Fast Marching Method

作　　者：包义环 林超 郑文婷 刘景良 黄欢 BAO Yihuan;LIN Chao;ZHENG Wenting;LIU Jingliang;HUANG Huan(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Fujian Chengyu Municipal Engineering Co.,Ltd.,Fuzhou 350002,China;College of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;Juhuang Group Co.,Ltd.,Xiamen Fujian 361021,China)

机构地区：[1]福建农林大学交通与土木工程学院,福建福州350002 [2]福建诚誉市政工程有限公司,福建福州3501000 [3]福建工程学院土木工程学院,福建福州350118 [4]聚璜集团有限公司,福建厦门361021

出　　处：《佳木斯大学学报（自然科学版）》2023年第1期135-139,共5页Journal of Jiamusi University：Natural Science Edition

基　　金：国家自然科学基金青年项目(51608122);福建省自然科学基金面上项目(2020J01581);福建农林大学科技创新专项基金项目(CXZX2020112A)。

摘　　要：传统的无损检测方法大多只能定性判断混凝土结构内部是否存在缺陷,却无法估计内部缺陷的具体尺寸信息。为此,提出一种基于零差法与走时层析成像算法相结合的成像算法并将之应用于混凝土构件内部缺陷的位置和尺寸识别。通过多个有限元数值算例对上述方法进行验证,研究结果表明:所提方法基本能够判断缺陷的具体位置和大致尺寸。当混凝土块模型的缺陷尺寸减小时,走时层析成像效果先变好后变差;当混凝土模型的缺陷尺寸不变而位置发生变化时,处于中轴线位置的缺陷成像效果较好,而处于中轴线和对角线过渡区域以及对角线上时的缺陷成像效果则比较一般。Most traditional non-destructive testing methods have the potential to qualitatively detect defects inside concrete structures, however, they cannot estimate the specific sizes of the internal detects accurately. Therefore, a travel time tomography algorithm is proposed based on zero-difference to detect the position and size of internal defects in concrete members. Several numerical examples are investigated to verify the method mentioned above. The results show that the specific position and size of the defects can be detected by the proposed method. When the defect size of the concrete model decreases, the imaging effect becomes better at first and subsequently changes to worse. By contrast, the defect position plays an important impact on the defect imaging. Actually, the quality of the defect imaging is best when the defect is located around the center, while unsatisfactory images will be obtained if the defects are located at other positions.

关 键 词：压电陶瓷 混凝土 走时层析成像 缺陷识别 有限元 

分 类 号：TU311.3[建筑科学—结构工程]