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Title: Retrofitting of reinforced concrete beams with CFRP straps to enhance shear capacity
Author: Hoult, Neil Anthony
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2006
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A technique has been developed that employs thin Carbon Fibre Reinforced Polymer (CFRP) straps for shear enhancement of RC beams. Previous studies using these straps have employed steel pads on top of the beam to support the strap but this is problematic from a practical point of view. The initial goal of this research was to develop a method of installing the straps without requiring access to the top surface of the slab that still provided effective shear enhancement, thus reducing the costs associated with repair. This novel strap installation method was developed through a series of tensile tests on the straps. It was found that the straps must be kept away from the sharp edges of the concrete, that the strap cross section must be kept flat, and that the material supporting the strap must be sufficiently stiff. Seven T-beam tests were performed to develop a strap configuration that maximized the shear enhancement but could also be installed from under the slab. The chosen installation technique involved drilling holes in the flange and then filling the holes with grout except for a small groove to support the strap. To ensure maximum enhancement, the straps need to fully penetrate the compression flange of the beam and the amount of flange area removed for the straps should be minimized. The shear capacity is also affected by the size of the loading pad. A Finite Element Analysis (FEA) determined that holes in the flange act as crack propagators, strap penetration affects the stiffness of the beam and undersized load pads allow shear cracks to form on lower energy paths.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available