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Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression

Concrete-filled steel tube (CFST) structural members have been widely used in engineering projects for their superior strength and ductility. However, the different lateral dilation characteristics between concrete infill and steel tube have caused imperfect composite interaction during the early lo...

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Autores principales: Alatshan, Faesal, Osman, Siti Aminah, Mashiri, Fidelis, Hamid, Roszilah
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6982038/
https://www.ncbi.nlm.nih.gov/pubmed/31861564
http://dx.doi.org/10.3390/ma13010023
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author Alatshan, Faesal
Osman, Siti Aminah
Mashiri, Fidelis
Hamid, Roszilah
author_facet Alatshan, Faesal
Osman, Siti Aminah
Mashiri, Fidelis
Hamid, Roszilah
author_sort Alatshan, Faesal
collection PubMed
description Concrete-filled steel tube (CFST) structural members have been widely used in engineering projects for their superior strength and ductility. However, the different lateral dilation characteristics between concrete infill and steel tube have caused imperfect composite interaction during the early loading stage. To overcome this issue, external steel confinements in the form of rings and spiral were previously suggested to minimise the lateral expansion of the steel tube and enhance the concrete confinement effects. This study presented the analytical behaviour of circular CFST short columns with an external ring or spiral confinements which are subjected to axial loading. An explicit finite element (FE) model was developed and verified based on previous experimental findings. Besides that, this study analysed the failure modes, axial load–strain relationship, stress distributions, and bond strength of the composite column components. Parametric analysis was also undertaken to evaluate the impact of material strengths, total steel ratio, and diameter-to-thickness ratio. The results suggest that the use of external steel confinement can enhance the compressive behaviour of CFSTs better than increasing the thickness of the steel tube when using the same steel ratio. Finally, simplified design formulations were developed to accurately calculate the ultimate capacity of CFST columns with and without external steel confinement.
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spelling pubmed-69820382020-02-07 Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression Alatshan, Faesal Osman, Siti Aminah Mashiri, Fidelis Hamid, Roszilah Materials (Basel) Article Concrete-filled steel tube (CFST) structural members have been widely used in engineering projects for their superior strength and ductility. However, the different lateral dilation characteristics between concrete infill and steel tube have caused imperfect composite interaction during the early loading stage. To overcome this issue, external steel confinements in the form of rings and spiral were previously suggested to minimise the lateral expansion of the steel tube and enhance the concrete confinement effects. This study presented the analytical behaviour of circular CFST short columns with an external ring or spiral confinements which are subjected to axial loading. An explicit finite element (FE) model was developed and verified based on previous experimental findings. Besides that, this study analysed the failure modes, axial load–strain relationship, stress distributions, and bond strength of the composite column components. Parametric analysis was also undertaken to evaluate the impact of material strengths, total steel ratio, and diameter-to-thickness ratio. The results suggest that the use of external steel confinement can enhance the compressive behaviour of CFSTs better than increasing the thickness of the steel tube when using the same steel ratio. Finally, simplified design formulations were developed to accurately calculate the ultimate capacity of CFST columns with and without external steel confinement. MDPI 2019-12-19 /pmc/articles/PMC6982038/ /pubmed/31861564 http://dx.doi.org/10.3390/ma13010023 Text en © 2019 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
Alatshan, Faesal
Osman, Siti Aminah
Mashiri, Fidelis
Hamid, Roszilah
Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression
title Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression
title_full Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression
title_fullStr Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression
title_full_unstemmed Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression
title_short Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression
title_sort explicit simulation of circular cfst stub columns with external steel confinement under axial compression
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6982038/
https://www.ncbi.nlm.nih.gov/pubmed/31861564
http://dx.doi.org/10.3390/ma13010023
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