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Article: Performance of axially restrained concrete encased steel composite columns at elevated temperatures

TitlePerformance of axially restrained concrete encased steel composite columns at elevated temperatures
Authors
KeywordsAxially restrained
Composite columns
Concrete encased steel
Elevated temperatures
Finite element
Fire resistance
Modelling
Structural fire design
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/engstruct
Citation
Engineering Structures, 2011, v. 33 n. 1, p. 245-254 How to Cite?
AbstractThe structural performance of axially restrained concrete encased steel composite columns at elevated temperatures is investigated in this study. An efficient nonlinear 3-D finite element model was presented for the analysis of the pin-ended axially loaded columns. The restraint ratios varied from 20% to 100% of the axial stiffness of the composite columns at ambient temperature. The finite element model was verified against published test results on axially restrained concrete encased steel composite columns at elevated temperatures. The columns investigated had different cross-sectional dimensions, different coarse aggregates and different load ratios during fire. The nonlinear material properties of steel, concrete, longitudinal and transverse reinforcement bars as well as the effect of concrete confinement at ambient and elevated temperatures were considered in the finite element model. The interface between the steel section and concrete, the longitudinal and transverse reinforcement bars, and the reinforcement bars and concrete were also considered allowing the bond behaviour to be modelled and the different components to retain its profile during the deformation of the column. The initial overall geometric imperfection was carefully included in the model. The time-temperature relationships, deformed shapes at failure, time-axial displacement relationships, failure modes and fire resistances of the columns were evaluated by the finite element model and compared well against test results. Furthermore, the variables that influence the fire resistance and behaviour of the axially restrained composite columns comprising different axial restraint ratios, different load ratios during fire, different coarse aggregates and different slenderness ratios were investigated in a parametric study. It is shown that axially restrained composite columns behave differently in fire compared to the unrestrained columns since the typical "runaway" failure was not predicted from the finite element analysis. The fire resistances of the composite columns obtained from the finite element analysis were compared with the design values obtained from the Eurocode 4 for composite columns at elevated temperatures. It is shown that the EC4 is generally conservative for all the axially restrained concrete encased steel composite columns, except for some columns with higher load and slenderness ratios. © 2010 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/139111
ISSN
2015 Impact Factor: 1.893
2015 SCImago Journal Rankings: 1.813
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong Special Administrative Region, ChinaHKU719308E
Funding Information:

The research work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. HKU719308E).

References

 

DC FieldValueLanguage
dc.contributor.authorYoung, Ben_HK
dc.contributor.authorEllobody, Een_HK
dc.date.accessioned2011-09-23T05:45:01Z-
dc.date.available2011-09-23T05:45:01Z-
dc.date.issued2011en_HK
dc.identifier.citationEngineering Structures, 2011, v. 33 n. 1, p. 245-254en_HK
dc.identifier.issn0141-0296en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139111-
dc.description.abstractThe structural performance of axially restrained concrete encased steel composite columns at elevated temperatures is investigated in this study. An efficient nonlinear 3-D finite element model was presented for the analysis of the pin-ended axially loaded columns. The restraint ratios varied from 20% to 100% of the axial stiffness of the composite columns at ambient temperature. The finite element model was verified against published test results on axially restrained concrete encased steel composite columns at elevated temperatures. The columns investigated had different cross-sectional dimensions, different coarse aggregates and different load ratios during fire. The nonlinear material properties of steel, concrete, longitudinal and transverse reinforcement bars as well as the effect of concrete confinement at ambient and elevated temperatures were considered in the finite element model. The interface between the steel section and concrete, the longitudinal and transverse reinforcement bars, and the reinforcement bars and concrete were also considered allowing the bond behaviour to be modelled and the different components to retain its profile during the deformation of the column. The initial overall geometric imperfection was carefully included in the model. The time-temperature relationships, deformed shapes at failure, time-axial displacement relationships, failure modes and fire resistances of the columns were evaluated by the finite element model and compared well against test results. Furthermore, the variables that influence the fire resistance and behaviour of the axially restrained composite columns comprising different axial restraint ratios, different load ratios during fire, different coarse aggregates and different slenderness ratios were investigated in a parametric study. It is shown that axially restrained composite columns behave differently in fire compared to the unrestrained columns since the typical "runaway" failure was not predicted from the finite element analysis. The fire resistances of the composite columns obtained from the finite element analysis were compared with the design values obtained from the Eurocode 4 for composite columns at elevated temperatures. It is shown that the EC4 is generally conservative for all the axially restrained concrete encased steel composite columns, except for some columns with higher load and slenderness ratios. © 2010 Elsevier Ltd.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/engstructen_HK
dc.relation.ispartofEngineering Structuresen_HK
dc.subjectAxially restraineden_HK
dc.subjectComposite columnsen_HK
dc.subjectConcrete encased steelen_HK
dc.subjectElevated temperaturesen_HK
dc.subjectFinite elementen_HK
dc.subjectFire resistanceen_HK
dc.subjectModellingen_HK
dc.subjectStructural fire designen_HK
dc.titlePerformance of axially restrained concrete encased steel composite columns at elevated temperaturesen_HK
dc.typeArticleen_HK
dc.identifier.emailYoung, B:young@hku.hken_HK
dc.identifier.authorityYoung, B=rp00208en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.engstruct.2010.10.019en_HK
dc.identifier.scopuseid_2-s2.0-78649450524en_HK
dc.identifier.hkuros196392en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78649450524&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume33en_HK
dc.identifier.issue1en_HK
dc.identifier.spage245en_HK
dc.identifier.epage254en_HK
dc.identifier.isiWOS:000285905100026-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridYoung, B=7402192398en_HK
dc.identifier.scopusauthoridEllobody, E=8280203300en_HK
dc.identifier.citeulike8363994-

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