Bond Behaviour of Steel Reinforcing Bars Embedded in Ultra-High-Performance Steel Fiber Reinforced Concrete

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dc.contributor.advisorPantazopoulou, Stavroula
dc.contributor.advisorPalermo, Dan
dc.creatorSaikali, Elisabeth Rita
dc.date.accessioned2019-07-02T16:13:54Z
dc.date.available2019-07-02T16:13:54Z
dc.date.copyright2019-02-27
dc.date.issued2019-07-02
dc.date.updated2019-07-02T16:13:54Z
dc.degree.disciplineCivil Engineering
dc.degree.levelMaster's
dc.degree.nameMASc - Master of Applied Science
dc.description.abstractUltra-High-Performance Steel Fiber Reinforced Concrete (UHP-SFRC) is an emerging concrete considered as an optimal, durable material that can substitute conventional concrete owing to its distinct fresh and hardened properties. Thus, it is essential to understand the mechanism of stress transfer between this concrete and conventional reinforcement that permits the composite action of both materials. A four-point bending test program (FPBT) was arranged and conducted on 19 beams designed for the bond development to occur in the constant moment region along a short embedment length in order to achieve a uniform distribution of bond stresses, enabling measurement of bond strength through reverse engineering of beam strength and deformation. Additional material testing was conducted on prisms under 4-point loading in order to extract the mechanical properties for all material mixes considered. The bond-specimens failed either by pullout or by cone formation with minimal deterioration of the concrete cover, illustrating the high confinement provided by the novel concrete surrounding the bar in tension. The bond strength was determined to be directly proportional to the tensile strength capacity of the design mix, where for the strongest material the bond strength was approximately 30 MPa. Moreover, the test results indicated a very ductile flexural beam response accompanied by significant mid-span deflection reaching 27 mm and substantial bar-slip values attaining 19 mm. Different UHP-SFRC mixes, concrete covers, and embedment lengths were considered. A numerical model was developed to simulate the FPBT using a nonlinear finite element analysis platform, VecTor2, with the ability to model this novel concrete. This high bond strength provided by the concrete cover enables a significant reduction in the design development length as compared to what is used today for conventional concrete.
dc.identifier.urihttp://hdl.handle.net/10315/36270
dc.language.isoen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectCivil engineering
dc.subject.keywordsBond strength
dc.subject.keywordsUltra-High-Performance Steel Fiber Reinforced Concrete (UHPSFRC)
dc.subject.keywordsConcrete cover
dc.subject.keywordsEmbedment length
dc.subject.keywordsFout-point-bending test
dc.subject.keywordsNonlinear finite element analysis
dc.subject.keywordsFlowability
dc.subject.keywordsFlexural strength
dc.subject.keywordsTensile strength
dc.subject.keywordsDevelopment length
dc.subject.keywordsAnchored beams
dc.subject.keywordsPullout-splitting
dc.subject.keywordsCone
dc.subject.keywordsYielding
dc.subject.keywordsHigh confinement
dc.subject.keywordsTensile hoop stresses
dc.subject.keywordsDesign mix
dc.subject.keywordsBar-spli
dc.subject.keywordsMid-span deflection
dc.subject.keywordsNumerical model
dc.titleBond Behaviour of Steel Reinforcing Bars Embedded in Ultra-High-Performance Steel Fiber Reinforced Concrete
dc.typeElectronic Thesis or Dissertation

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