Analytical and Numerical Study of Fire-Damaged Circular Concrete Columns Repaired Using Composite Confinement Techniques

Hussain, I; Yaqub, M; Mortazavi, M; Ehsan, MA; Hussain, M

Analytical and Numerical Study of Fire-Damaged Circular Concrete Columns Repaired Using Composite Confinement Techniques

Hussain, I Yaqub, M Mortazavi, M

Ehsan, MA Hussain, M

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Publisher:: ICE PUBLISHING
Publication Type:: Journal Article
Citation:: Proceedings of the Institution of Civil Engineers: Structures and Buildings, 2022
Issue Date:: 2022-01-01

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Field	Value	Language
dc.contributor.author	Hussain, I
dc.contributor.author	Yaqub, M
dc.contributor.author	Mortazavi, M https://orcid.org/0000-0001-5123-7903
dc.contributor.author	Ehsan, MA
dc.contributor.author	Hussain, M
dc.date.accessioned	2023-04-20T03:46:10Z
dc.date.available	2023-04-20T03:46:10Z
dc.date.issued	2022-01-01
dc.identifier.citation	Proceedings of the Institution of Civil Engineers: Structures and Buildings, 2022
dc.identifier.issn	0965-0911
dc.identifier.issn	1751-7702
dc.identifier.uri	http://hdl.handle.net/10453/170022
dc.description.abstract	This paper presents numerical and regression modeling of 21 undamaged, fire-damaged, and repaired fire-damaged reinforced circular concrete (RC) columns. The columns were exposed to three different temperatures of 300°C, 500°C, and 900°C and tested for axial residual capacity. It was found that concrete loses its strength after exposure to a temperature of 300°C or above. Fire-damaged columns were then repaired using various composite confinement techniques. Strength was regained when CFRP confinement was applied to fire-damaged columns but it increased the deformation as well and thus reduced the stiffness which is not desirable. To overcome this challenge, steel wire mesh, filled with cement sand mortar and wrapped with CFRP was employed. Further, a numerical model was developed that could precisely predict the residual capacity of these columns. The paper briefly reviewed and summarised the development of numerical techniques, including material properties, geometry, elements, loading, boundary conditions, and contact algorithm for undamaged, fire-damaged, and repaired fire-damaged columns. Moreover, analytical equations were developed using linear, multiple, and quadratic regression modeling. The results obtained using the proposed model and regression equations showed that these models offered a better alternative to the experimental testing for the prediction of the post-fire performance of damaged and repaired RC columns.
dc.language	English
dc.publisher	ICE PUBLISHING
dc.relation.ispartof	Proceedings of the Institution of Civil Engineers: Structures and Buildings
dc.relation.isbasedon	10.1680/jstbu.21.00017
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering
dc.title	Analytical and Numerical Study of Fire-Damaged Circular Concrete Columns Repaired Using Composite Confinement Techniques
dc.type	Journal Article
utslib.for	0905 Civil Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2023-04-20T03:46:09Z
pubs.publication-status	Published

Abstract:

This paper presents numerical and regression modeling of 21 undamaged, fire-damaged, and repaired fire-damaged reinforced circular concrete (RC) columns. The columns were exposed to three different temperatures of 300°C, 500°C, and 900°C and tested for axial residual capacity. It was found that concrete loses its strength after exposure to a temperature of 300°C or above. Fire-damaged columns were then repaired using various composite confinement techniques. Strength was regained when CFRP confinement was applied to fire-damaged columns but it increased the deformation as well and thus reduced the stiffness which is not desirable. To overcome this challenge, steel wire mesh, filled with cement sand mortar and wrapped with CFRP was employed. Further, a numerical model was developed that could precisely predict the residual capacity of these columns. The paper briefly reviewed and summarised the development of numerical techniques, including material properties, geometry, elements, loading, boundary conditions, and contact algorithm for undamaged, fire-damaged, and repaired fire-damaged columns. Moreover, analytical equations were developed using linear, multiple, and quadratic regression modeling. The results obtained using the proposed model and regression equations showed that these models offered a better alternative to the experimental testing for the prediction of the post-fire performance of damaged and repaired RC columns.

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http://hdl.handle.net/10453/170022