基于 EMI 测量的 CFST 柱界面脱粘缺陷检测:实验、数值模拟和实际盲检

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Qian Liu, Bin Xu, Zongjun Xia, Zhifei Chen, Yudi Yao, Jiang Wang
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引用次数: 0

摘要

混凝土填充钢管(CFST)构件已广泛应用于摩天大楼和大跨度桥梁。养护过程中水化热分布不均匀、施工过程中压实不充分以及大体积混凝土在使用过程中不可避免的收缩和徐变很可能导致混凝土核心筒与钢管之间出现界面脱粘缺陷,这一直是人们普遍关注的问题。针对现有 CFST 构件的界面粘结状况开发有效的无损检测方法至关重要。在本研究中,首先提出了一种基于机电阻抗(EMI)测量的界面脱粘缺陷检测方法,该方法使用表面贴装的压电-铅锆钛酸盐(PZT)传感器。然后,利用具有人工模拟界面脱粘缺陷的缩放 CFST 试样对所提方法的可行性进行了实验研究。测量并比较了不同频段的表面贴装 PZT 传感器的 EMI,以验证所提方法对模拟界面脱粘缺陷的可探测性。第三,建立了带有界面脱粘缺陷的多物理场 CFST-PZT 耦合有限元模型(FEM),并模拟了不同位置的表面安装 PZT 传感器的 EMI。说明了界面脱粘缺陷对 EMI 测量的影响。最后,利用所提出的方法,对一座现有摩天大楼中选定的 CFST 柱的界面粘接状况进行了盲检。在测试的 CFST 柱中,粘接和脱粘缺陷都能被正确检测出来,并通过钻孔观测得到验证。实验、数值和工程应用结果表明,所提出的方法对 CFST 构件的界面脱粘检测非常有效,并且对 CFST 构件中 0.3 毫米的轻微脱粘缺陷非常敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interface debonding defect detection for CFST columns based on EMI measurements: Experiment, numerical simulation and blind inspection in practice
Concrete-filled steel tube (CFST) members have been widely used in skyscrapers and long-span bridges. Non-uniformly distributed hydration heat during curing, inadequate compaction during construction and unavoidable shrinkage and creep of mass concrete in service most likely lead to interface debonding defects between concrete core and steel tube, which has been a common concern. The development of effective non-destructive inspection methods for interface bonding condition of existing CFST members is critical. In this study, an interface debonding defect detection method based on electromechanical impedance (EMI) measurement using surface-mounted piezoelectric-lead-zirconate-titanate (PZT) sensors is proposed at first. Then, experimental study on the feasibility of the proposed approach is carried out with scaled CFST specimens with artificially mimicked interface debonding defects. EMI of surface-mounted PZT sensors at different frequency bands are measured and compared to verify the detectability of the proposed approach for the mimicked interface debonding defects. Thirdly, a multi-physics CFST-PZT coupling finite element model (FEM) with interface debonding defects is established, and EMI of surface-mounted PZT sensors at different locations is simulated. The influence of interface debonding defects on EMI measurements is illustrated. Finally, a blind inspection on the interface bonding condition of selected CFST columns in an existing skyscraper in service using the proposed approach is carried out. Both bonding and debonding defect in the tested CFST columns are detected correctly and validated with drilling hole observation. Experimental, numerical and engineering application results show the proposed approach is effective for interface debonding detection of CFST members and sensitive to minor debonding defect of 0.3 mm in CFST members.
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来源期刊
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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