Tests on the Ductility of Reinforced Concrete Beams Retrofitted with FRP and Steel Near-Surface Mounted Plates
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VIEW THE REPLYPublication: Journal of Composites for Construction
Volume 10, Issue 2
Abstract
Reinforced concrete beams are now commonly retrofitted using externally bonded (EB) fiber reinforced polymer (FRP) plates as the technique is both inexpensive and unobtrusive. However, tests have shown that EB carbon FRP plates tend to debond at low strains, which can severely limit the ductility or moment redistribution to such an extent that guidelines often preclude moment redistribution. This paper reports the moment redistribution achieved in tests on nine near full-scale two-span continuous reinforced concrete beams that were retrofitted with near-surface mounted (NSM) plates. The plates were either carbon FRP or high yield steel strips which were adhesively bonded within saw grooves cut into the concrete cover on the tension face or sides of the beam. It was found that the debonding strains of these NSM plates were considerably larger than those associated with EB plates and that substantial amounts of moment redistribution occurred. These tests suggest that NSM plates can be used to increase the strength of reinforced concrete structures with little, if any, loss of ductility.
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References
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 10 • Issue 2 • April 2006
Pages: 106 - 114
Copyright
© 2006 ASCE.
History
Received: Apr 30, 2005
Accepted: Sep 21, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
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