Behaviour of Reinforced Concrete Beams Retrofitted/Repaired in Shear with Fibre Reinforced Polymers
Date of Award
Master of Engineering Science
Civil and Environmental Engineering
Prof. Moncef Nehdi
This study aims to explore the shear behaviour of externally Fibre-Reinforced Polymer (FRP) bonded reinforced concrete beams under quasi-static or monotonic loading. The effects of key parameters such as the shear span to effective depth ratio, FRP type and scheme, and stiffness of FRP sheets on shear behaviour aspects such as the ultimate load capacity, deflection, crack pattern, mode of failure, and final strain in the FRP sheets were investigated. This study consists o f two main phases incorporating experimental and numerical parts. In the experimental part, six beams were tested using different types of FRP sheets under quasi-static cyclic load and then three of these beams were repaired using epoxy injection along with new CFRP sheets and retested. A finite Element Model (FEM) was developed to predict the results of the first phase of the experimental study. The Genetic Algorithms (GAs) approach was used to develop simple, yet more accurate, formulas for predicting the ultimate load of RC beams under monotonic loading based on experimental data found in the open literature. The accuracy of the proposed model was found to be superior to that of common design guidelines namely, the ACI440, Eurocode (EC2), Matthys model, Colotti model, and the ISIS Canada guidelines. Considerable improvement of the ultimate shear capacity of beams retrofitted using externally bonded hybrid FRP sheets was observed. The simultaneous application of epoxy injection and externally bonded FRP sheets can significantly improve the ductility and load capacity of damaged beams.
Deilami, Hasan Nikopour, "Behaviour of Reinforced Concrete Beams Retrofitted/Repaired in Shear with Fibre Reinforced Polymers" (2009). Digitized Theses. 3763.