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Details of Grant 

EPSRC Reference: GR/S55101/01
Title: Fibre reinforced polymer strengthening of pre-cracked concrete structures
Principal Investigator: Lees, Professor J
Other Investigators:
Morley, Dr C
Researcher Co-Investigators:
Project Partners:
Empa (Swiss Fed Labs of Mat Sci Tech) Highways Agency Sika Ltd
Tony Gee
Department: Engineering
Organisation: University of Cambridge
Scheme: Standard Research (Pre-FEC)
Starts: 01 July 2004 Ends: 30 September 2007 Value (£): 255,189
EPSRC Research Topic Classifications:
Civil Engineering Materials
EPSRC Industrial Sector Classifications:
Construction Transport Systems and Vehicles
Related Grants:
Panel History:  
Summary on Grant Application Form
Durable, cost-effective strengthening and repair strategies are essential in order to extend the lifetime of existing infrastructure. In particular, FRPs which are strong, light-weight and durable, have tremendous potential for use as external reinforcement to enhance the shear capacity of concrete structures. Since the early 20th century, plasticity approaches have been used to describe the shear behaviour of reinforced concrete. These approaches rely on stress redistribution due to the ductile yielding of steel reinforcement and the great beauty of plasticity theory is that the initial state of stress in the structure is irrelevant. However, FRPs do not yield; thus a knowledge of the true state of stress and strain in the structure, including the stress history, is critical in order to confidently predict the structural behaviour. This proposal will determine the influence of an existing crack pattern on the behaviour of a reinforced concrete member strengthened using FRP external shear reinforcement. Both passive bonded and prestressed unbonded FRP systems will be considered. Complementary experimental and theoretical approaches will be carried out to determine the conditions under which new cracks form and the repercussions of the crack development on the strengthened behaviour. The results of this project will provide significant advances in the fields of structural assessment, strengthening and repair
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Organisation Website: http://www.cam.ac.uk