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Article: Repair of fire-exposed preloaded rectangular concrete columns by postcompressed steel plates

TitleRepair of fire-exposed preloaded rectangular concrete columns by postcompressed steel plates
Authors
Issue Date2014
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/st.html
Citation
Journal of Structural Engineering, 2014, v. 140 n. 3, article no. 04013083 How to Cite?
AbstractThis paper describes an experimental study of axially loaded, fire-exposed, rectangular reinforced concrete (RC) columns repaired with post-compressed steel plates. Seven RC columns with identical section dimensions and reinforcement details were fabricated and tested. Six of them were exposed to a four-hour fire load according to the ISO 834 Standard. After one month of cooling, five of the fire-exposed columns were installed with precambered steel plates which were then post-compressed by a method newly developed by the authors. All columns were tested under axial compression to determine their ultimate load capacity, deformation and ductility. The effects of steel plate thickness, initial precamber displacements and preloading level on the ultimate load capacity of repaired RC columns were investigated. The test results show that up to 72% of the original capacity of the axial load-carrying capacity of fire exposed columns repaired with post-compressed steel plates can be restored. Furthermore, the repaired specimens show better ductility and post-peak deformability. An analytical model was adopted to predict the ultimate axial load capacity of fire exposed columns repaired with post-compressed steel plates. Comparison of the theoretical and experimental results reveals that the analytical model can accurately predict the ultimate axial load capacity of the repaired columns.
Persistent Identifierhttp://hdl.handle.net/10722/199049

 

DC FieldValueLanguage
dc.contributor.authorWang, Len_US
dc.contributor.authorSu, KLen_US
dc.date.accessioned2014-07-22T01:00:37Z-
dc.date.available2014-07-22T01:00:37Z-
dc.date.issued2014en_US
dc.identifier.citationJournal of Structural Engineering, 2014, v. 140 n. 3, article no. 04013083en_US
dc.identifier.urihttp://hdl.handle.net/10722/199049-
dc.description.abstractThis paper describes an experimental study of axially loaded, fire-exposed, rectangular reinforced concrete (RC) columns repaired with post-compressed steel plates. Seven RC columns with identical section dimensions and reinforcement details were fabricated and tested. Six of them were exposed to a four-hour fire load according to the ISO 834 Standard. After one month of cooling, five of the fire-exposed columns were installed with precambered steel plates which were then post-compressed by a method newly developed by the authors. All columns were tested under axial compression to determine their ultimate load capacity, deformation and ductility. The effects of steel plate thickness, initial precamber displacements and preloading level on the ultimate load capacity of repaired RC columns were investigated. The test results show that up to 72% of the original capacity of the axial load-carrying capacity of fire exposed columns repaired with post-compressed steel plates can be restored. Furthermore, the repaired specimens show better ductility and post-peak deformability. An analytical model was adopted to predict the ultimate axial load capacity of fire exposed columns repaired with post-compressed steel plates. Comparison of the theoretical and experimental results reveals that the analytical model can accurately predict the ultimate axial load capacity of the repaired columns.en_US
dc.languageengen_US
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/st.htmlen_US
dc.relation.ispartofJournal of Structural Engineeringen_US
dc.rightsJournal of Structural Engineering. Copyright © American Society of Civil Engineers.en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleRepair of fire-exposed preloaded rectangular concrete columns by postcompressed steel platesen_US
dc.typeArticleen_US
dc.identifier.emailSu, KL: klsu@hkucc.hku.hken_US
dc.identifier.authoritySu, KL=rp00072en_US
dc.description.naturepostprint-
dc.identifier.hkuros231898en_US
dc.identifier.volume140en_US
dc.identifier.issue3en_US
dc.identifier.spage04013083-1en_US
dc.identifier.epage04013083-10en_US
dc.publisher.placeNew Yorken_US

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