Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression

A new structure termed “concrete-filled FRP-grooved steel composite tube (CFGCT) column” is proposed, which is composed of a stress-released steel tube (i.e., grooved steel tube), fiber-reinforced polymer (FRP) and concrete. Axial load tests were carried out on twenty-four specimens to investigate t...

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Autores principales:	Kunting Miao, Yang Wei, Xi Zhang, Kaiqi Zheng, Fenghui Dong
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	FRP stress-released steel tube composite structure axial compression behavior stress-strain model Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/8b98f648abef400bad2758e43e5d04d1
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spelling	oai:doaj.org-article:8b98f648abef400bad2758e43e5d04d12021-11-11T18:42:17ZPerformance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression10.3390/polym132136382073-4360https://doaj.org/article/8b98f648abef400bad2758e43e5d04d12021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3638https://doaj.org/toc/2073-4360A new structure termed “concrete-filled FRP-grooved steel composite tube (CFGCT) column” is proposed, which is composed of a stress-released steel tube (i.e., grooved steel tube), fiber-reinforced polymer (FRP) and concrete. Axial load tests were carried out on twenty-four specimens to investigate the constraint effect of this structure. Three main experimental variables were considered: the steel tube thickness, the FRP type, and the FRP layer. The failure modes, stress-strain relationships and the effect of the main experimental variables were discussed. The stress-strain curves of this new structure are composed of an initial linear part, a nonlinear transition part, a strengthening part and a residual part. The test results demonstrate that the bearing capacity of the structure was improved, and that the mechanical mechanism of the structure was simplified due to the stress-released grooves. Based on the test results and previous studies, formulas for calculating the ultimate stress (<i>f<sub>cu</sub></i>), ultimate strain (<i>ε<sub>cu</sub></i>), peak stress (<i>f<sub>cc</sub></i>) and peak strain (<i>ε<sub>cc</sub></i>) were proposed. In addition, models for predicting the stress-strain curves of CFGCT columns were put forward, and the models could precisely simulate the stress-strain curve of this new composite structure. Hence, this study indicates that a structure composed of FRP and stress-released steel tube can effectively constrain concrete.Kunting MiaoYang WeiXi ZhangKaiqi ZhengFenghui DongMDPI AGarticleFRPstress-released steel tubecomposite structureaxial compression behaviorstress-strain modelOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3638, p 3638 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	FRP stress-released steel tube composite structure axial compression behavior stress-strain model Organic chemistry QD241-441
spellingShingle	FRP stress-released steel tube composite structure axial compression behavior stress-strain model Organic chemistry QD241-441 Kunting Miao Yang Wei Xi Zhang Kaiqi Zheng Fenghui Dong Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression
description	A new structure termed “concrete-filled FRP-grooved steel composite tube (CFGCT) column” is proposed, which is composed of a stress-released steel tube (i.e., grooved steel tube), fiber-reinforced polymer (FRP) and concrete. Axial load tests were carried out on twenty-four specimens to investigate the constraint effect of this structure. Three main experimental variables were considered: the steel tube thickness, the FRP type, and the FRP layer. The failure modes, stress-strain relationships and the effect of the main experimental variables were discussed. The stress-strain curves of this new structure are composed of an initial linear part, a nonlinear transition part, a strengthening part and a residual part. The test results demonstrate that the bearing capacity of the structure was improved, and that the mechanical mechanism of the structure was simplified due to the stress-released grooves. Based on the test results and previous studies, formulas for calculating the ultimate stress (<i>f<sub>cu</sub></i>), ultimate strain (<i>ε<sub>cu</sub></i>), peak stress (<i>f<sub>cc</sub></i>) and peak strain (<i>ε<sub>cc</sub></i>) were proposed. In addition, models for predicting the stress-strain curves of CFGCT columns were put forward, and the models could precisely simulate the stress-strain curve of this new composite structure. Hence, this study indicates that a structure composed of FRP and stress-released steel tube can effectively constrain concrete.
format	article
author	Kunting Miao Yang Wei Xi Zhang Kaiqi Zheng Fenghui Dong
author_facet	Kunting Miao Yang Wei Xi Zhang Kaiqi Zheng Fenghui Dong
author_sort	Kunting Miao
title	Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression
title_short	Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression
title_full	Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression
title_fullStr	Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression
title_full_unstemmed	Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression
title_sort	performance of circular concrete-filled frp-grooved steel composite tube columns under axial compression
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8b98f648abef400bad2758e43e5d04d1
work_keys_str_mv	AT kuntingmiao performanceofcircularconcretefilledfrpgroovedsteelcompositetubecolumnsunderaxialcompression AT yangwei performanceofcircularconcretefilledfrpgroovedsteelcompositetubecolumnsunderaxialcompression AT xizhang performanceofcircularconcretefilledfrpgroovedsteelcompositetubecolumnsunderaxialcompression AT kaiqizheng performanceofcircularconcretefilledfrpgroovedsteelcompositetubecolumnsunderaxialcompression AT fenghuidong performanceofcircularconcretefilledfrpgroovedsteelcompositetubecolumnsunderaxialcompression
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Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression

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