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Article: Investigation of concrete encased steel composite columns at elevated temperatures

TitleInvestigation of concrete encased steel composite columns at elevated temperatures
Authors
KeywordsComposite columns
Concrete encased steel
Elevated temperatures
Finite element
Fire resistance
Modelling
Structural fire design
Issue Date2010
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/tws
Citation
Thin-Walled Structures, 2010, v. 48 n. 8, p. 597-608 How to Cite?
AbstractThis paper presents a nonlinear 3-D finite element model investigating the behaviour of concrete encased steel composite columns at elevated temperatures. The composite columns were pin-ended axially loaded columns having different cross-sectional dimensions, different structural steel sections, 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 models. 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 (out-of-straightness) geometric imperfection was carefully included in the model. The finite element model has been validated against published tests conducted at elevated temperatures. The timetemperature relationships, deformed shapes at failure, timeaxial displacement relationships, failure modes and fire resistances of the columns were evaluated by the finite element model. It has been shown that the finite element model can accurately predict the behaviour of the columns at elevated temperatures. Furthermore, the variables that influence the fire resistance and behaviour of the composite columns comprising different load ratios during fire, different coarse aggregates and different slenderness ratios were investigated in parametric studies. It is shown that the fire resistance of the columns generally increases with the decrease in the column slenderness ratio as well as the increase in the structural steel ratio. It is also shown that the timeaxial displacement relationship is considerably affected by the coarse aggregate. The fire resistances of the composite columns obtained from the finite element analyses were compared with the design values obtained from the Eurocode 4 for composite columns at elevated temperatures. It is shown that the EC4 is conservative for all the concrete encased steel composite columns, except for the columns having a load ratio of 0.5 as well as the columns having a slenderness ratio of 0.69 and a load ratio of 0.4. © 2010 Elsevier Ltd All rights resvered.
Persistent Identifierhttp://hdl.handle.net/10722/139106
ISSN
2015 Impact Factor: 2.063
2015 SCImago Journal Rankings: 1.647
ISI Accession Number ID
Funding AgencyGrant Number
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.authorEllobody, Een_HK
dc.contributor.authorYoung, Ben_HK
dc.date.accessioned2011-09-23T05:45:00Z-
dc.date.available2011-09-23T05:45:00Z-
dc.date.issued2010en_HK
dc.identifier.citationThin-Walled Structures, 2010, v. 48 n. 8, p. 597-608en_HK
dc.identifier.issn0263-8231en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139106-
dc.description.abstractThis paper presents a nonlinear 3-D finite element model investigating the behaviour of concrete encased steel composite columns at elevated temperatures. The composite columns were pin-ended axially loaded columns having different cross-sectional dimensions, different structural steel sections, 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 models. 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 (out-of-straightness) geometric imperfection was carefully included in the model. The finite element model has been validated against published tests conducted at elevated temperatures. The timetemperature relationships, deformed shapes at failure, timeaxial displacement relationships, failure modes and fire resistances of the columns were evaluated by the finite element model. It has been shown that the finite element model can accurately predict the behaviour of the columns at elevated temperatures. Furthermore, the variables that influence the fire resistance and behaviour of the composite columns comprising different load ratios during fire, different coarse aggregates and different slenderness ratios were investigated in parametric studies. It is shown that the fire resistance of the columns generally increases with the decrease in the column slenderness ratio as well as the increase in the structural steel ratio. It is also shown that the timeaxial displacement relationship is considerably affected by the coarse aggregate. The fire resistances of the composite columns obtained from the finite element analyses were compared with the design values obtained from the Eurocode 4 for composite columns at elevated temperatures. It is shown that the EC4 is conservative for all the concrete encased steel composite columns, except for the columns having a load ratio of 0.5 as well as the columns having a slenderness ratio of 0.69 and a load ratio of 0.4. © 2010 Elsevier Ltd All rights resvered.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/twsen_HK
dc.relation.ispartofThin-Walled Structuresen_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.titleInvestigation of concrete encased steel composite columns at elevated temperaturesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0263-8231&volume=48&issue=8&spage=597&epage=608&date=2010&atitle=Investigation+of+concrete+encased+steel+composite+columns+at+elevated+temperatures-
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.tws.2010.03.004en_HK
dc.identifier.scopuseid_2-s2.0-77955322063en_HK
dc.identifier.hkuros196387en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77955322063&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume48en_HK
dc.identifier.issue8en_HK
dc.identifier.spage597en_HK
dc.identifier.epage608en_HK
dc.identifier.isiWOS:000279235100003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridEllobody, E=8280203300en_HK
dc.identifier.scopusauthoridYoung, B=7402192398en_HK
dc.identifier.citeulike7053053-

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