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Other titre : Experimental and theoretical investigations of a new bond-type anchorage system for post-tensioning applications with FRP tendons

dc.contributor.advisorBenmokrane, Brahimfr
dc.contributor.authorZhang, Burongfr
dc.date.accessioned2014-05-15T12:27:38Z
dc.date.available2014-05-15T12:27:38Z
dc.date.created2001fr
dc.date.issued2001fr
dc.identifier.isbn0612748308fr
dc.identifier.urihttp://savoirs.usherbrooke.ca/handle/11143/1732
dc.description.abstractLes tiges en composites a base de polymères renforces de fibres (PRF) semblent très prometteuses a utiliser comme alternative à l'acier dans les structures en béton précontraint et les ancrages, particulièrement pour des structures exposées a des environnements corrosifs. Les objectifs de cette étude sont l'investigation du comportement à l'adhérence des tiges en PRF et des coulis à l'intérieur de tube en acier et par conséquent pour développer un système d'ancrage idéal pour des applications de structures en post-tension. La modélisation du comportement a l'adhérence et la prédiction de la capacité de charge de ces systèmes sont aussi étudiées. Plusieurs essais d'arrachement (plus de 50) ont été réalisés et analyses pour mieux comprendre les mécanismes d'adhérence et l'influence du type de fibres, de la surface externe, et d'autres paramètres significatifs (rigidité de confinement., type de coulis et conditions de cure) sur la performance d'adhérence. La modélisation du comportement à l'adhérence et du glissement de tiges en PRF noyées dans un coulis est examinée pour évaluer son adéquation dans la reproduction du comportement expérimental de 1'adherence. Base sur les résultats de la distribution des contraintes sur la longueur d'ancrage, Ie mécanisme d'ancrage des tendons en PRF est discute. Un modèle conceptuel pour calculer la contrainte d'adhérence à l'interface et la résistance a la traction des ancrages a été établi.fr
dc.description.abstractAbstract: Fiber reinforced polymer (FRP) composite rods appear very promising to be used as an alternative to steel in prestressed concrete structures and ground anchors, especially for applications exposed to corrosive environments. The objectives of this study are to investigate the bond behavior of FRP rods to grout filled in steel tubes and hence to develop a competent bond-type anchorage system for post-tensioning applications with FRP multirod tendons. The research program includes pullout tests of grouted FRP rods and proving tests of the developed anchorage system for post-tensioning applications. Modeling the bond behavior and predicting the load bearing capacity of bond-type anchorage systems are also involved. Numerous (over 50) pullout tests were conducted and discussed to better understand bond mechanisms and the influence of type of fiber, outer surface, and other significant parameters (i.e., confining stiffness, grout type and curing condition) on bond performance. Modeling of bond-slip behavior of grouted FRP rods is examined to assess its adequacy to reproduce the experimental bond behavior. Based on the monitoring results of strain distribution along the bonded length, the working mechanism of bond-type anchorages for FRP tendons is discussed. A conceptual model for calculating the bond stress at the tendon-grout interface and the tensile capacity of bond-type anchorages for FRP tendons is established. A new bond-type anchorage system has been developed for post-tensioning applications with FRP tendons. Evaluations of the developed anchorage system have been conducted in anchorage models with CFRP mono- and 9- rod tendons under tensile and sustained loading conditions. Furthermore, the developed anchorage system has also been used as an anchor head for post-tensioning of a full-scale FRP anchor model. Primary test results have indicated that the developed bond-type anchorage performs well for post-tensioning applications with FRP tendons. Conclusions and recommendations are made on the design of bond-type anchorages and post-tensioning applications of FRP tendons. Six related papers have been published in referred journals or international conferences, including two papers in the ASCE Journal of Composites for Construction , one in Construction and Building Materials (UK), one in the Canadian Journal of Civil Engineering , and two in the international conferences.en
dc.language.isoengfr
dc.publisherUniversité de Sherbrookefr
dc.rights© Burong Zhangfr
dc.subjectCâbles de précontraintefr
dc.subjectBéton postcontraintfr
dc.titleInvestigation expérimentale et théorique sur un nouveau système de tête d'ancrage pour les tendons en matériaux composites pour des applications de post-contraintefr
dc.title.alternativeExperimental and theoretical investigations of a new bond-type anchorage system for post-tensioning applications with FRP tendonsfr
dc.typeThèsefr
tme.degree.disciplineGénie civilfr
tme.degree.grantorFaculté de géniefr
tme.degree.levelDoctoratfr
tme.degree.namePh.D.fr


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