Bond behavior of FRP-to-concrete under cyclic fatigue loading of RC structures strengthened with EB-FRP composites
Notice bibliographique
Résumé
Reinforced concrete (RC) structures such as bridge girders are subjected, during their service life, to cyclic fatigue loading, mainly in the form of traffic loads. These structures are prone to progressive damage and may experience shear failure, which is often characterized by brittle rupture without any prior warning. Hence, retrofitting RC structures deficient in shear calls for the application of appropriate strengthening systems. The use of externally bonded (EB) fiber reinforced polymer (FRP) composites features numerous advantages and is a promising technology for shear strengthening of RC structures. However, the performance of EB-FRP retrofitted concrete structures can be highly influenced by the bond at FRP-to-concrete interface, as interfacial debonding can lead to the premature failure of the strengthening system. Limited investigations have been carried out on the FRP-to-concrete bond behavior of EB-FRP strengthened concrete structures under cyclic fatigue loading, and therefore, further related research will contribute to a better understanding of this complex research area. \n \nThe present research study aims to investigate the fatigue bond behavior at the FRP-to-concrete interface of EB-FRP strengthened RC structures. To this end, in the first phase of this study, a literature-review is conducted to identify the parameters affecting the fatigue bond mechanism at the FRP-to-concrete interface. Indeed, it is indicated that carbon FRPs (CFRPs) can provide better fatigue resistance than other FRP composites, such as glass and aramid FRPs. \n \nAn experimental investigation is conducted in the second phase of this study to fill existing gaps in the literature regarding the FRP-to-concrete bond behavior. A series of double-lap shear tests on CFRP-to-concrete bonded joints are designed to evaluate the interfacial behavior as a function of different variables, such as the FRP composite type (CFRP laminate vs. CFRP fabric sheet), the FRP-to-concrete width ratio (bonded FRP width to concrete width), and the FRP bond length under both monotonic and cyclic loading. The results of this experimental program demonstrate the superior performance of the CFRP composite bonding system using fabric sheet over the CFRP laminate in terms of bond ultimate resistance under monotonic loading and bond fatigue life under cyclic loading. Furthermore, increasing the CFRP-toconcrete width ratio was found to improve the bond behavior against the debonding failure mode under both loading conditions. As for the bond length, further discussions are presented to evaluate this parameter on the bond behavior, with emphasis on determining the effective bond length under both monotonic and cyclic loading conditions. \n \nBy incorporating the current experimental results and research data available in the literature, analytical studies are conducted to develop the following two models: 1) a bond stress-slip relationship under monotonic loading; and 2) a fatigue-life prediction model of CFRP-toconcrete bond under cyclic loading. Both models are shown to perform satisfactorily when validated against the selected database and can be an effective tool for predicting the bond behavior at the CFRP-to-concrete interface of concrete structures strengthened in shear with CFRP composites.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,002 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,002 | 0,001 |
| Intégrité de la recherche | 0,004 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; les deux têtes enseignantes s’accordent sur ce qui est montré ici.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».