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Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns

In order to investigate the bond behavior of preplaced aggregate concrete-filled steel tube (CFT-PAC) columns and the difference of bond behavior between CFT-PAC columns and normal concrete-filled steel tube (CFT-NC) columns, a total of 11 columns were prepared and the push-out tests were conducted....

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Autores principales: Lv, Jing, Zhou, Tianhua, Du, Qiang, Li, Kunlun, Jin, Liangwei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7013690/
https://www.ncbi.nlm.nih.gov/pubmed/31936537
http://dx.doi.org/10.3390/ma13020300
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author Lv, Jing
Zhou, Tianhua
Du, Qiang
Li, Kunlun
Jin, Liangwei
author_facet Lv, Jing
Zhou, Tianhua
Du, Qiang
Li, Kunlun
Jin, Liangwei
author_sort Lv, Jing
collection PubMed
description In order to investigate the bond behavior of preplaced aggregate concrete-filled steel tube (CFT-PAC) columns and the difference of bond behavior between CFT-PAC columns and normal concrete-filled steel tube (CFT-NC) columns, a total of 11 columns were prepared and the push-out tests were conducted. The experimental parameters included the type of concrete (preplaced aggregate concrete and normal concrete), concrete strength (C40, C50 and C60), cross-section dimension (D = 219 mm, 299 mm and 351 mm) and the thickness of steel tube (t = 6 mm and 8 mm). The results indicated that the CTF-PAC columns had a similar load-slip curves with CFT-NC columns. The bond stresses of the CFT-PAC columns were higher than that of the PAC-NC columns at the same concrete strength. Increasing compressive strength of PAC increased the critical bond strength and bond strength of CFT-PAC columns. With an increase of the L/D ratio, both of the slip corresponding to peak load and bond strength of CFT-PAC columns exhibited an increasing trend. A rise in the D/t ratio led to a decrease in the bond stress of CFT-PAC columns and an increase in slip corresponding to the peak load of CFT-PAC columns. The proposed bond stress–slip relationship model considerably matched the bond stress–slip relationship of CFT-PAC columns.
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spelling pubmed-70136902020-03-09 Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns Lv, Jing Zhou, Tianhua Du, Qiang Li, Kunlun Jin, Liangwei Materials (Basel) Article In order to investigate the bond behavior of preplaced aggregate concrete-filled steel tube (CFT-PAC) columns and the difference of bond behavior between CFT-PAC columns and normal concrete-filled steel tube (CFT-NC) columns, a total of 11 columns were prepared and the push-out tests were conducted. The experimental parameters included the type of concrete (preplaced aggregate concrete and normal concrete), concrete strength (C40, C50 and C60), cross-section dimension (D = 219 mm, 299 mm and 351 mm) and the thickness of steel tube (t = 6 mm and 8 mm). The results indicated that the CTF-PAC columns had a similar load-slip curves with CFT-NC columns. The bond stresses of the CFT-PAC columns were higher than that of the PAC-NC columns at the same concrete strength. Increasing compressive strength of PAC increased the critical bond strength and bond strength of CFT-PAC columns. With an increase of the L/D ratio, both of the slip corresponding to peak load and bond strength of CFT-PAC columns exhibited an increasing trend. A rise in the D/t ratio led to a decrease in the bond stress of CFT-PAC columns and an increase in slip corresponding to the peak load of CFT-PAC columns. The proposed bond stress–slip relationship model considerably matched the bond stress–slip relationship of CFT-PAC columns. MDPI 2020-01-09 /pmc/articles/PMC7013690/ /pubmed/31936537 http://dx.doi.org/10.3390/ma13020300 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lv, Jing
Zhou, Tianhua
Du, Qiang
Li, Kunlun
Jin, Liangwei
Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns
title Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns
title_full Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns
title_fullStr Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns
title_full_unstemmed Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns
title_short Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns
title_sort research on the bond behavior of preplaced aggregate concrete-filled steel tube columns
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7013690/
https://www.ncbi.nlm.nih.gov/pubmed/31936537
http://dx.doi.org/10.3390/ma13020300
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