Axial compression performance of thin-walled T-shaped concrete filled steel tubular columns under constant high temperature: Experimental and numerical study

Wang, W; Lyu, X; Zhang, Y; Yu, Y; Zhang, T

Axial compression performance of thin-walled T-shaped concrete filled steel tubular columns under constant high temperature: Experimental and numerical study

Wang, W Lyu, X Zhang, Y Yu, Y

Zhang, T

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Publisher:: ELSEVIER SCIENCE INC
Publication Type:: Journal Article
Citation:: Structures, 2020, 27, pp. 525-541
Issue Date:: 2020-10-01

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Field	Value	Language
dc.contributor.author	Wang, W
dc.contributor.author	Lyu, X
dc.contributor.author	Zhang, Y
dc.contributor.author	Yu, Y https://orcid.org/0000-0001-9592-8191
dc.contributor.author	Zhang, T
dc.date.accessioned	2020-11-01T20:35:00Z
dc.date.available	2020-11-01T20:35:00Z
dc.date.issued	2020-10-01
dc.identifier.citation	Structures, 2020, 27, pp. 525-541
dc.identifier.issn	2352-0124
dc.identifier.issn	2352-0124
dc.identifier.uri	http://hdl.handle.net/10453/143674
dc.description.abstract	© 2020 Institution of Structural Engineers This study investigates the effects of temperature and stiffener on the axial compression performance of thin-walled T-shaped concrete filled steel tubular (CFST) stub columns. Eight CFST columns with and without stiffener were fabricated and exposed to different elevated temperatures, then tested for axial compressive performance. The complete load-displacement curve of the specimens under axial compression, the failure pattern after test and the failure characteristics of concrete core are also discussed. The finite element analysis is then developed to establish the calculation model of temperature field and axial pressure field of thin-walled T-shaped concrete filled steel tubular stub columns with stiffeners at constant high temperature. The FE model presents a highly agreement with experimental data in term of load-displacement behavior, which enable to further investigate stress distribution and failure mechanism of the columns. In addition, parametric study is conducted showing that temperature, thickness of steel tube, yield strength of steel tube and compressive strength of concrete are the key factors in contributing to axial compressive performance of the CFST stub columns. Finally, to provide reference for practical application of engineering, a simplified calculation formula for ultimate bearing capacity and axial compression stiffness of CFST stub columns were obtained via the regression analysis based on results from the experimental and numerical analysis. The result shows that the relative errors between results calculated from simplified formulae and from FE models are within 10%, which indicates that the proposed formulae are able to provide the theoretical reference for the practical engineering applications.
dc.language	English
dc.publisher	ELSEVIER SCIENCE INC
dc.relation	Ausgrid
dc.relation.ispartof	Structures
dc.relation.isbasedon	10.1016/j.istruc.2020.06.004
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.title	Axial compression performance of thin-walled T-shaped concrete filled steel tubular columns under constant high temperature: Experimental and numerical study
dc.type	Journal Article
utslib.citation.volume	27
utslib.for	0905 Civil Engineering
utslib.for	0905 Civil Engineering
utslib.for	1202 Building
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
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2020-11-01T20:34:54Z
pubs.publication-status	Published
pubs.volume	27

Abstract:

© 2020 Institution of Structural Engineers This study investigates the effects of temperature and stiffener on the axial compression performance of thin-walled T-shaped concrete filled steel tubular (CFST) stub columns. Eight CFST columns with and without stiffener were fabricated and exposed to different elevated temperatures, then tested for axial compressive performance. The complete load-displacement curve of the specimens under axial compression, the failure pattern after test and the failure characteristics of concrete core are also discussed. The finite element analysis is then developed to establish the calculation model of temperature field and axial pressure field of thin-walled T-shaped concrete filled steel tubular stub columns with stiffeners at constant high temperature. The FE model presents a highly agreement with experimental data in term of load-displacement behavior, which enable to further investigate stress distribution and failure mechanism of the columns. In addition, parametric study is conducted showing that temperature, thickness of steel tube, yield strength of steel tube and compressive strength of concrete are the key factors in contributing to axial compressive performance of the CFST stub columns. Finally, to provide reference for practical application of engineering, a simplified calculation formula for ultimate bearing capacity and axial compression stiffness of CFST stub columns were obtained via the regression analysis based on results from the experimental and numerical analysis. The result shows that the relative errors between results calculated from simplified formulae and from FE models are within 10%, which indicates that the proposed formulae are able to provide the theoretical reference for the practical engineering applications.

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http://hdl.handle.net/10453/143674