Moment-curvature and strain energy of beams with
external fiber-reinforced polymer reinforcement
Moment-curvature and strain energy of beams with
external fiber-reinforced polymer reinforcement
To calculate the load at which fiber-reinforced polymer (FRP) plates will debond from a reinforced concrete (RC) beam using fracture mechanics principles based on energy release rates, it is necessary to accurately determine the strain energy in the beam. This study presents a moment-curvature model for an RC beam with the presence of a net axial force that is due to the force in the FRP plate. The classical Branson analysis only covers the case of a cracked-elastic concrete beam with no axial force. The paper shows how the model can be extended into the inelastic regime and can be used to determine the moment-curvature relations on loading. Comparisons with the available test data have shown good correlation. The model is then extended into an unloading regime for the strain energy determinations of RC beams with external reinforcement, which may be bonded or partially debonded.
Branson’s model, elastic stiffness, moment-curvature, strain energy
20-29
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Burgoyne, C.J.
4be2f2b6-7e64-4fb2-94a8-f2a0886b6751
1 January 2009
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Burgoyne, C.J.
4be2f2b6-7e64-4fb2-94a8-f2a0886b6751
Achintha, M. and Burgoyne, C.J.
(2009)
Moment-curvature and strain energy of beams with
external fiber-reinforced polymer reinforcement.
ACI Structural Journal, 106 (1), .
Abstract
To calculate the load at which fiber-reinforced polymer (FRP) plates will debond from a reinforced concrete (RC) beam using fracture mechanics principles based on energy release rates, it is necessary to accurately determine the strain energy in the beam. This study presents a moment-curvature model for an RC beam with the presence of a net axial force that is due to the force in the FRP plate. The classical Branson analysis only covers the case of a cracked-elastic concrete beam with no axial force. The paper shows how the model can be extended into the inelastic regime and can be used to determine the moment-curvature relations on loading. Comparisons with the available test data have shown good correlation. The model is then extended into an unloading regime for the strain energy determinations of RC beams with external reinforcement, which may be bonded or partially debonded.
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Published date: 1 January 2009
Keywords:
Branson’s model, elastic stiffness, moment-curvature, strain energy
Organisations:
Infrastructure Group
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Local EPrints ID: 209477
URI: http://eprints.soton.ac.uk/id/eprint/209477
ISSN: 0889-3241
PURE UUID: 265990c3-a37b-4c18-b640-472684bb41e0
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Date deposited: 30 Jan 2012 11:24
Last modified: 14 Mar 2024 04:45
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Author:
M. Achintha
Author:
C.J. Burgoyne
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