Stress-Strain Models for UHPFRC and Application in Seismic Design and Retrofit of Bridges

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dc.contributor.advisorPantazopoulou, Stavroula
dc.contributor.authorMohammed, Ismail
dc.date.accessioned2023-03-28T21:23:05Z
dc.date.available2023-03-28T21:23:05Z
dc.date.copyright2023-01-13
dc.date.issued2023-03-28
dc.date.updated2023-03-28T21:23:04Z
dc.degree.disciplineCivil Engineering
dc.degree.levelMaster's
dc.degree.nameMASc - Master of Applied Science
dc.description.abstractWith the advent of Ultra-High-Performance Fiber-Reinforced Concrete (UHPFRC), most shortcomings of conventional concrete are mitigated, since UHPFRC has exceptional mechanical and durability properties. The behavior of the material in tension is the most important property that need be characterized with confidence for practical implementation of UHPFRC in construction. This is often extracted through reverse inverse analysis of flexural tests – existing inverse analysis methods are fraught with great uncertainty and scatter. In this thesis, several alternative characterization methods are explored and corroborated with test results, including an inverse analysis procedure that is consistent with first principles, as well as a practical, chart-based procedure for quality control by practitioners. Apart from the direct tension response, the tension stiffening property of UHPFRC when it interacts with embedded reinforcement was also studied both experimentally and through detailed finite element simulation. Parameters of the study included the volumetric ratio of fibers, casting methodology, loading protocol and the condition of the embedded reinforcement (corroded or uncorroded). Results quantify the amount of tension stiffening that UHPFC cover can provide to reinforcement. The emphasis on tensile stress and strain capacity of UHPFRC is of interest in seismic retrofitting of existing columns through jacketing. In this work a design framework was developed to design UHPFRC jackets by setting performance objectives for the retrofitted column, strain limits for the UHPFRC material in tension and compression, and by development of a constitutive relationship for the encased concrete under the influence of confinement imparted by the jacket. The study includes an illustrative example of a bridge pier confined with two alternative UHPFRC materials of different strength, indicating the effectiveness of the proposed methodology in estimating the performance limit states of the retrofitted component.
dc.identifier.urihttp://hdl.handle.net/10315/41037
dc.languageen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectCivil engineering
dc.subjectDesign
dc.subject.keywordsUltra-high-performance fiber-reinforced concrete
dc.subject.keywordsStress-strain models
dc.subject.keywordsTensile behavior
dc.subject.keywordsCompressive behavior
dc.subject.keywordsSeismic design
dc.subject.keywordsBridge pier retrofit
dc.subject.keywordsUHPC
dc.subject.keywordsUHPFRC
dc.subject.keywordsInverse analysis
dc.subject.keywordsForward analysis
dc.subject.keywordsDigital image correlation
dc.subject.keywordsFinite element analysis
dc.subject.keywordsFinite element modeling
dc.subject.keywordsATENA
dc.subject.keywordsColumn jacketing with UHPFRC
dc.subject.keywordsPerformance-based design
dc.subject.keywordsSeismic guidelines
dc.subject.keywordsTension stiffening of UHPFRC
dc.subject.keywordsCorroded reinforcement behavior
dc.subject.keywordsFlexural tests
dc.subject.keywordsTension tests
dc.subject.keywordsCompression tests
dc.subject.keywordsBending tests
dc.subject.keywordsStress-strain response
dc.titleStress-Strain Models for UHPFRC and Application in Seismic Design and Retrofit of Bridges
dc.typeElectronic Thesis or Dissertation

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