Master of Science in Civil Engineering (MSCE)
Civil and Environmental Engineering
This thesis presents a study on the shear retrofit of reinforced concrete (RC) beams with externally bonded fiber reinforced polymers (FRP), since it is very important for RC beam to have a shear strength that is higher than the flexural strength in order to ensure ductile flexural failure mode. The study proposes a new model to predict the FRP shear strength contribution for different modes of failure, i.e., bending, shear with FRP rupture, shear with FRP debonding, and mixed shear-flexure and various retrofit techniques, i.e., side-bonding, U-jacketing, and full wrapping. The proposed model is compared to other existing models for FRP shear strength contribution, which are available in the literature. This comparison is made in terms of model prediction capabilities for experimentally measured shear strength increments due to FRP retrofit, which are also taken from previous literature studies. It is observed that the proposed model is in overall in good agreement with the experimental data. Furthermore, the results of this study are used to formulate a general-purpose frame finite element (FE) to compute the load carrying capacity and predict the behavior of RC beams when retrofitted with externally bonded FRP in shear. The finite element is extended to model a two dimensional frame structure with strong columns and weak beams that are deficient in shear. It is found that the proposed frame FE captures well the increase in load carrying capacity of the frame structures.
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Bellamkonda, Srinivasa Anusha, "Modeling of shear strengthening of reinforced concrete beams retrofitted with externally bonded fiber reinforced polymers" (2013). LSU Master's Theses. 4250.