A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Fatigue behavior of carbon fiber reinforced polymer-strengthened reinforced concrete bridge girders
This study examines the effects of one-dimensional fiber-reinforced polymer (FRP) composite rehabilitation systems on the flexural fatigue performance of reinforced concrete bridge girders. Eight 508 mm deep and 5.6 m long reinforced concrete T-beams, with and without bonded FRP reinforcement on their tensile surfaces, were tested with a concentrated load at midspan under constant amplitude cyclic loading. It has been shown that the fatigue behavior of such retrofit beams is controlled by the fatigue behavior of the reinforcing steel. The fatigue life of a reinforced concrete beam can be increased by the application of an FRP retrofit, which relieves some of the stress carried by the steel. Thus, it is important that the FRP retrofit be as stiff as possible. For this reason, carbon FRP, rather than glass, is preferred. The observed increase in fatigue life, however, is limited by the quality of the bond between the CFRP and the concrete substrate. Debonding, initiating at midspan and progressing to a support, is common and is driven partially by the crack distribution and shear deformations of the beam. Once debonding has progressed, stresses are no longer transferred to the CFRP and the fatigue behavior of the beam reverts to that of an unretrofit beam.
Fatigue behavior of carbon fiber reinforced polymer-strengthened reinforced concrete bridge girders
This study examines the effects of one-dimensional fiber-reinforced polymer (FRP) composite rehabilitation systems on the flexural fatigue performance of reinforced concrete bridge girders. Eight 508 mm deep and 5.6 m long reinforced concrete T-beams, with and without bonded FRP reinforcement on their tensile surfaces, were tested with a concentrated load at midspan under constant amplitude cyclic loading. It has been shown that the fatigue behavior of such retrofit beams is controlled by the fatigue behavior of the reinforcing steel. The fatigue life of a reinforced concrete beam can be increased by the application of an FRP retrofit, which relieves some of the stress carried by the steel. Thus, it is important that the FRP retrofit be as stiff as possible. For this reason, carbon FRP, rather than glass, is preferred. The observed increase in fatigue life, however, is limited by the quality of the bond between the CFRP and the concrete substrate. Debonding, initiating at midspan and progressing to a support, is common and is driven partially by the crack distribution and shear deformations of the beam. Once debonding has progressed, stresses are no longer transferred to the CFRP and the fatigue behavior of the beam reverts to that of an unretrofit beam.
Fatigue behavior of carbon fiber reinforced polymer-strengthened reinforced concrete bridge girders
Ermüdungsverhalten von mit carbonfaserverstärktem Kunststoff verstärkten Stahlbetonbrückenträgern
Aidoo, John (author) / Harries, Kent A. (author) / Petrou, Michael F. (author)
Journal of Composites for Construction ; 8 ; 501-509
2004
9 Seiten, 7 Bilder, 2 Tabellen, 20 Quellen
Article (Journal)
English
Fatigue Behavior of Carbon Fiber Reinforced Polymer-Strengthened Reinforced Concrete Bridge Girders
| British Library Online Contents | 2004
Fatigue Behavior of Carbon Fiber Reinforced Polymer-Strengthened Reinforced Concrete Bridge Girders
| Online Contents | 2004