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A platform for research: civil engineering, architecture and urbanism
Flexural strengthening of reinforced concrete beams by mechanically attaching fiber-reinforced polymer strips
The current method of bonding fiber-reinforced polymer (FRP) strengthening strips to concrete structures requires extensive time and semiskilled labor. A strengthening method has been developed where the strengthening strip is entirely mechanically attached to the concrete surface using multiple small, distributed powder-actuated fasteners without any bonding. The use of multiple small fasteners, as opposed to large-diameter bolts, distributes the load more evenly over the composite strip and does not cause catastrophic failure due to excessive stress concentrations at the holes in the composite strip. Beams strengthened with mechanically fastened FRP strips showed increases in yield moment over the control beams of up to 21.6 % and showed increases in the ultimate moment of up to 20.1 %. The testing in this study has shown that using the fastened method, it was possible to achieve a failure mode similar to that seen in a standard reinforced concrete beam. Without predrilling, beams with intermediate and hybrid strengthening strips tended to fail by strip detachment. Fasteners in the moment span may have helped the beams achieve a higher level of strengthening. Predrilling pilot holes reduces the amount of visible initial cracking and spalling and allows greater penetration of the fasteners, resulting in better overall strengthening and ductility.
Flexural strengthening of reinforced concrete beams by mechanically attaching fiber-reinforced polymer strips
The current method of bonding fiber-reinforced polymer (FRP) strengthening strips to concrete structures requires extensive time and semiskilled labor. A strengthening method has been developed where the strengthening strip is entirely mechanically attached to the concrete surface using multiple small, distributed powder-actuated fasteners without any bonding. The use of multiple small fasteners, as opposed to large-diameter bolts, distributes the load more evenly over the composite strip and does not cause catastrophic failure due to excessive stress concentrations at the holes in the composite strip. Beams strengthened with mechanically fastened FRP strips showed increases in yield moment over the control beams of up to 21.6 % and showed increases in the ultimate moment of up to 20.1 %. The testing in this study has shown that using the fastened method, it was possible to achieve a failure mode similar to that seen in a standard reinforced concrete beam. Without predrilling, beams with intermediate and hybrid strengthening strips tended to fail by strip detachment. Fasteners in the moment span may have helped the beams achieve a higher level of strengthening. Predrilling pilot holes reduces the amount of visible initial cracking and spalling and allows greater penetration of the fasteners, resulting in better overall strengthening and ductility.
Flexural strengthening of reinforced concrete beams by mechanically attaching fiber-reinforced polymer strips
Biegefestigkeitserhöhung von Stahlbetonträgern mittels mechanisch befestigter, faserverstärkter Kunststoffstreifen
Lamanna, Anthony J. (author) / Bank, Lawrence C. (author) / Scott, David W. (author)
Journal of Composites for Construction ; 8 ; 203-210
2004
8 Seiten, 11 Bilder, 3 Tabellen, 13 Quellen
Article (Journal)
English
| British Library Online Contents | 2004
Flexural strengthening of reinforced concrete beams using carbon fibre reinforced polymer strips
| Online Contents | 2003