Long-term Non-linear Behaviour And Buckling Of Shallow Concrete-filled Steel Tubular Arches

Pi, Y; Bradford, MA; Qu, W

Long-term Non-linear Behaviour And Buckling Of Shallow Concrete-filled Steel Tubular Arches

Pi, Y Bradford, MA Qu, W

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Publisher:: Pergamon-Elsevier Science Ltd
Publication Type:: Journal Article
Citation:: International Journal Of Non-Linear Mechanics, 2011, 46 (9), pp. 1155 - 1166
Issue Date:: 2011-01

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Field	Value	Language
dc.contributor.author	Pi, Y	en_US
dc.contributor.author	Bradford, MA	en_US
dc.contributor.author	Qu, W	en_US
dc.date.issued	2011-01	en_US
dc.identifier.citation	International Journal Of Non-Linear Mechanics, 2011, 46 (9), pp. 1155 - 1166	en_US
dc.identifier.issn	0020-7462	en_US
dc.identifier.uri	http://hdl.handle.net/10453/18399
dc.description.abstract	This paper presents a theoretical analysis for the long-term non-linear elastic in-plane behaviour and buckling of shallow concrete-filled steel tubular (CFST) arches. It is known that an elastic shallow arch does not buckle under a load that is lower than the critical loads for its bifurcation or limit point buckling because its buckling equilibrium configuration cannot be achieved, and the arch is in a stable equilibrium state although its structural response may be quite non-linear under the load. However, for a CFST arch under a sustained load, the visco-elastic effects of creep and shrinkage of the concrete core produce significant long-term increases in the deformations and bending moments and subsequently lead to a time-dependent change of its equilibrium configuration. Accordingly, the bifurcation point and limit point of the time-dependent equilibrium path and the corresponding buckling loads of CFST arches also change with time. When the changing time-dependent bifurcation or limit point buckling load of a CFST arch becomes equal to the sustained load, the arch may buckle in a bifurcation mode or in a limit point mode in the time domain. A virtual work method is used in the paper to investigate bifurcation and limit point buckling of shallow circular CFST arches that are subjected to a sustained uniform radial load. The algebraically tractable age-adjusted effective modulus method is used to model the time-dependent behaviour of the concrete core, based on which solutions for the prebuckling structural life time corresponding to non-linear bifurcation and limit point buckling are derived.	en_US
dc.publisher	Pergamon-Elsevier Science Ltd	en_US
dc.relation.ispartof	International Journal Of Non-Linear Mechanics	en_US
dc.relation.isbasedon	10.1016/j.ijnonlinmec.2011.05.003	en_US
dc.subject.classification	Mechanical Engineering & Transports	en_US
dc.title	Long-term Non-linear Behaviour And Buckling Of Shallow Concrete-filled Steel Tubular Arches	en_US
dc.type	Journal Article
utslib.citation.volume	9	en_US
utslib.citation.volume	46	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0102 Applied Mathematics	en_US
utslib.for	0913 Mechanical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	closed_access
pubs.consider-herdc	true	en_US
pubs.issue	9	en_US
pubs.volume	46	en_US

Abstract:

This paper presents a theoretical analysis for the long-term non-linear elastic in-plane behaviour and buckling of shallow concrete-filled steel tubular (CFST) arches. It is known that an elastic shallow arch does not buckle under a load that is lower than the critical loads for its bifurcation or limit point buckling because its buckling equilibrium configuration cannot be achieved, and the arch is in a stable equilibrium state although its structural response may be quite non-linear under the load. However, for a CFST arch under a sustained load, the visco-elastic effects of creep and shrinkage of the concrete core produce significant long-term increases in the deformations and bending moments and subsequently lead to a time-dependent change of its equilibrium configuration. Accordingly, the bifurcation point and limit point of the time-dependent equilibrium path and the corresponding buckling loads of CFST arches also change with time. When the changing time-dependent bifurcation or limit point buckling load of a CFST arch becomes equal to the sustained load, the arch may buckle in a bifurcation mode or in a limit point mode in the time domain. A virtual work method is used in the paper to investigate bifurcation and limit point buckling of shallow circular CFST arches that are subjected to a sustained uniform radial load. The algebraically tractable age-adjusted effective modulus method is used to model the time-dependent behaviour of the concrete core, based on which solutions for the prebuckling structural life time corresponding to non-linear bifurcation and limit point buckling are derived.

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http://hdl.handle.net/10453/18399