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Flexural behavior of concrete beams prestressed with bonded and unbonded tendons
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Abu-Obeidah, Adi. Flexural behavior of concrete beams prestressed with bonded and unbonded tendons. Retrieved from https://doi.org/doi:10.7282/T3CN76P5

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TitleFlexural behavior of concrete beams prestressed with bonded and unbonded tendons
NameAbu-Obeidah, Adi (author); Nassif, Hani (chair); Najm, Husam (internal member); WANG, HAO (internal member); Tsakalakos, Thomas (outside member); Rutgers University; Graduate School - New Brunswick
Date Created2017
Other Date2017-05 (degree)
SubjectCivil and Environmental Engineering, Tendons (Prestressed concrete), Concrete beams
Extent1 online resource (xiii, 135 p. : ill.)
DescriptionThe use of unbonded tendons in prestressed concrete beams has been widely utilized in bridges, parking structures, and residential buildings for strengthening, rehabilitation or repair of such members. With the growth of live load and the increase of damaged concrete members, there is a need to develop and utilize new techniques for more efficient and improved designs in prestressed concrete members. This research presents an experimental and analytical investigation for the use of combination of bonded and unbonded tendons in the same concrete members. With the availability of high strength concrete, as well as the development of new prestressing technologies, the process can be easily performed at the site for repair or capacity upgrading resulting in longer spans for the same section depth or shallower sections. There is a knowledge gap on the behavior of concrete beams prestressed with hybrid tendons and a need to fully understand their overall behavior under full service loads. The hybrid technique introduces unbonded CFRP tendons, which is resistant to corrosion. In addition, CFRP tendons exhibit linear stress-strain relationship resulting in more accurate predictions for the tendon stress at ultimate. This hybrid system presents a challenge in developing an analytical model that could predict their behavior since the unbonded tendon is not bonded with the concrete. This investigation included the testing of 15 High Strength Concrete (HSC) beams prestressed with hybrid tendons. Results from the experimental study included number of cracks, load-deflection behavior, and strains in prestressing strand, reinforcing steel, and concrete. This study emphasizes the prediction of the ultimate stress of the unbonded tendon (fps) in unbonded or hybrid system for computing the ultimate moment resistance. Finite element modeling and analysis of various beams is performed. Based on a comparison of equations available in the literature as well as code provisions with the experimental results, a simplified prediction equation for predicting the stress in the unbonded tendons at ultimate is recommended.
NotePh.D.
NoteIncludes bibliographical references
Noteby Adi Abu-Obeidah
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/T3CN76P5
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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