Performance of Eccentrically Loaded Reinforced Concrete Columns Confined with Shape Memory Alloy Wires

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dc.contributor.advisorEl-Hacha, Raafat
dc.contributor.authorAbdelrahman, Khaled
dc.contributor.committeememberDuncan, Neil
dc.contributor.committeememberShrive, Nigel
dc.contributor.committeememberPriest, Jeffrey
dc.contributor.committeememberFederico, Salvatore
dc.contributor.committeememberAl-Mahaidi, Riadh
dc.date2018-06
dc.date.accessioned2018-01-05T00:14:09Z
dc.date.available2018-01-05T00:14:09Z
dc.date.issued2017-12-15
dc.description.abstractSmart materials such as Shape Memory Alloys (SMA) are recently utilized for strengthening and repairing of concrete structures. The most common form of SMA wires used for concrete confinement applications is Nickle Titanium (NiTi) because it possesses unique thermo-mechanical properties such as the Shape Memory Effect (SME) along with high recovery stress (up to 600 MPa) and strain (up to 8 %). Initial investigations reported in the literature show that actively confining concrete columns with SMA wires can enhance the strength and significantly increase the ductility of concrete. To date, the vast majority of experiments on SMA-confined concrete have considered short, unreinforced, small-scale concrete cylinders subjected to concentric axial loading. The objective of this study is to present a systematic study of medium-size reinforced concrete circular columns, internally reinforced with longitudinal steel bars and transverse steel stirrups and externally confined with SMA wires, subjected to eccentric loading. Test data are compared against identical unconfined reinforced concrete (RC) columns, and confined RC columns strengthened passively using Carbon Fibre Reinforced Polymer (CFRP) wrap sheets, in order to quantify and verify the effectiveness of the active SMA-confinement method. In addition, an analytical model is presented to describe the behaviour of SMA-confined RC columns subjected to combined axial loads and bending moments. A parametric study was conducted to evaluate the effects of certain parameters on the overall response and the axial-flexural diagrams of the SMA-confined RC columns. The results of this study show that the RC columns confined with active SMA spirals exhibited significant enhancement in the strength and ductility compared to the unconfined RC columns subjected to varying load eccentricity. Additionally, the SMA-confined RC columns demonstrated superior overall performance when compared to the conventional passive CFRP-confined RC columns. The results of this study also show that the proposed analytical model conservatively predicted the axial load-bending moment response of the SMA-confined RC columns. The RC column confinement parameters investigated, namely the concrete compressive strength, the volumetric ratio of the SMA spirals, and the internal longitudinal steel reinforcement ratio, significantly influenced the load-moment interaction response of the SMA-confined RC columns.en_US
dc.identifier.citationAbdelrahman, K. (2017). Performance of Eccentrically Loaded Reinforced Concrete Columns Confined with Shape Memory Alloy Wires (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/5229
dc.identifier.urihttp://hdl.handle.net/1880/106233
dc.language.isoenen_US
dc.publisher.facultySchulich School of Engineeringen_US
dc.publisher.institutionUniversity of Calgaryen
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.en_US
dc.subjectAnalyticalen_US
dc.subjectAxialen_US
dc.subjectCarbonen_US
dc.subjectCircularen_US
dc.subjectCompressionen_US
dc.subjectConfinementen_US
dc.subjectDuctilityen_US
dc.subjectEccentricen_US
dc.subjectShape Memory Alloy Wiresen_US
dc.subject.classificationEngineering--Civilen_US
dc.titlePerformance of Eccentrically Loaded Reinforced Concrete Columns Confined with Shape Memory Alloy Wiresen_US
dc.typedoctoral thesisen_US
thesis.degree.disciplineEngineering – Civilen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameDoctor of Philosophy (PhD)en_US
ucalgary.item.requestcopytrue
ucalgary.thesis.checklistI confirm that I have submitted all of the required forms to Faculty of Graduate Studies. (See <a href="http://grad.ucalgary.ca/current/thesis/ethesis">http://grad.ucalgary.ca/current/thesis/ethesis</a> for more details)en_US
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