Experimental Investigation on Interfacial Defect Criticality of FRP-Confined Concrete Columns
Defects between fiber reinforced polymer (FRP) and repaired concrete components may easily come out due to misoperation during manufacturing, environmental deterioration, or impact from external load during service life. The defects may cause a degraded structure performance and even the unexpected...
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doaj-963c9fde506d4b11aacc3c930d0c5f6c2020-11-25T02:00:08ZengMDPI AGSensors1424-82202019-01-0119346810.3390/s19030468s19030468Experimental Investigation on Interfacial Defect Criticality of FRP-Confined Concrete ColumnsRenyuan Qin0Denvid Lau1Lik-ho Tam2Tiejun Liu3Dujian Zou4Ao Zhou5Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong, ChinaDepartment of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong, ChinaSchool of Transportation Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing 100191, ChinaSchool of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, ChinaSchool of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, ChinaSchool of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, ChinaDefects between fiber reinforced polymer (FRP) and repaired concrete components may easily come out due to misoperation during manufacturing, environmental deterioration, or impact from external load during service life. The defects may cause a degraded structure performance and even the unexpected structural failure. Different non-destructive techniques (NDTs) and sensors have been developed to assess the defects in FRP bonded system. The information of linking up the detected defects by NDTs and repair schemes is needed by assessing the criticality of detected defects. In this study, FRP confined concrete columns with interfacial defects were experimentally tested to determine the interfacial defect criticality on structural performance. It is found that interfacial defect can reduce the FRP confinement effectiveness, and ultimate strength and its corresponding strain of column deteriorate significantly if the interfacial defect area is larger than 50% of total confinement area. Meanwhile, proposed analytical model considering the defect ratio is validated for the prediction of stress⁻strain behavior of FRP confined columns. The evaluation of defect criticality could be made by comparing predicted stress⁻strain behavior with the original design to determine corresponding maintenance strategies.https://www.mdpi.com/1424-8220/19/3/468FRPconfinementinterfacial defectstress–strain model |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Renyuan Qin Denvid Lau Lik-ho Tam Tiejun Liu Dujian Zou Ao Zhou |
spellingShingle |
Renyuan Qin Denvid Lau Lik-ho Tam Tiejun Liu Dujian Zou Ao Zhou Experimental Investigation on Interfacial Defect Criticality of FRP-Confined Concrete Columns Sensors FRP confinement interfacial defect stress–strain model |
author_facet |
Renyuan Qin Denvid Lau Lik-ho Tam Tiejun Liu Dujian Zou Ao Zhou |
author_sort |
Renyuan Qin |
title |
Experimental Investigation on Interfacial Defect Criticality of FRP-Confined Concrete Columns |
title_short |
Experimental Investigation on Interfacial Defect Criticality of FRP-Confined Concrete Columns |
title_full |
Experimental Investigation on Interfacial Defect Criticality of FRP-Confined Concrete Columns |
title_fullStr |
Experimental Investigation on Interfacial Defect Criticality of FRP-Confined Concrete Columns |
title_full_unstemmed |
Experimental Investigation on Interfacial Defect Criticality of FRP-Confined Concrete Columns |
title_sort |
experimental investigation on interfacial defect criticality of frp-confined concrete columns |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2019-01-01 |
description |
Defects between fiber reinforced polymer (FRP) and repaired concrete components may easily come out due to misoperation during manufacturing, environmental deterioration, or impact from external load during service life. The defects may cause a degraded structure performance and even the unexpected structural failure. Different non-destructive techniques (NDTs) and sensors have been developed to assess the defects in FRP bonded system. The information of linking up the detected defects by NDTs and repair schemes is needed by assessing the criticality of detected defects. In this study, FRP confined concrete columns with interfacial defects were experimentally tested to determine the interfacial defect criticality on structural performance. It is found that interfacial defect can reduce the FRP confinement effectiveness, and ultimate strength and its corresponding strain of column deteriorate significantly if the interfacial defect area is larger than 50% of total confinement area. Meanwhile, proposed analytical model considering the defect ratio is validated for the prediction of stress⁻strain behavior of FRP confined columns. The evaluation of defect criticality could be made by comparing predicted stress⁻strain behavior with the original design to determine corresponding maintenance strategies. |
topic |
FRP confinement interfacial defect stress–strain model |
url |
https://www.mdpi.com/1424-8220/19/3/468 |
work_keys_str_mv |
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1724962385319428096 |