Strengthening of reinforced concrete columns with various methods

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dc.contributor.advisorShrive, Nigel G.
dc.contributor.authorScholefield, Blair William James
dc.date.accessioned2017-12-18T21:00:25Z
dc.date.available2017-12-18T21:00:25Z
dc.date.issued2003
dc.descriptionBibliography: p. 112-115en
dc.descriptionSome pages are in colour.en
dc.description.abstractAs our infrastructure ages, many structures need strengthening to cope with increases in permitted loads. One area of concern is the repair of concrete columns. Severe corrosion of the reinforcing steel and the trouble of total replacement requires a non-destructive, easily applied method of protection and strengthening be used. One such renovation method involves the use of Fibre Reinforced Polymers (FRP's). These lightweight, high strength materials could be a new strengthening option for the rehabilitation of civil engineering structures. In an initial series of tests, square concrete columns were strengthened by wrapping with Carbon Fibre Reinforced Polymer (CFRP) sheets. The strength gains were higher than predicted. The inaccuracy of the predictions and the expense of the methodology used, indicated that further tests were required. These results suggested that column strengthening in not well understood, nor are there well-defined types of strengthening measures to suit different circumstances. More economical measures are desired in addition to strength prediction. Current design methods are based on the ultimate strain capacity of the wrap however, because of vertical compression cracks in the column, and/or buckling failure of the steel reinforcement the column fails prematurely. The results from the initial tests lead to the strengthening of fifty-four circular columns with six different strengthening measures. The measures that were assessed are: CFRP wrap, Glass FRP wrap (GFRP), GFRP spray, Steel hose clamps and column enlargement with additional concrete. For each measure, the Cost/Benefit ratio was determined accounting for the strength increase and initial costs. From the testing two things were observed 1) the strengthening measure with the best benefit/cost was sprayed GFRP and 2) Localized strain failure of the FRP jacket occurs because of circumferential column expansion at vertical compression cracks.
dc.format.extentx, 115 leaves : ill. ; 30 cm.en
dc.identifier.citationScholefield, B. W. (2003). Strengthening of reinforced concrete columns with various methods (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/70en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/70
dc.identifier.urihttp://hdl.handle.net/1880/101071
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.titleStrengthening of reinforced concrete columns with various methods
dc.typemaster thesis
thesis.degree.disciplineCivil Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 1470 520708905
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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