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Fatigue behavior of reinforced concrete beams strengthened with carbon fiber reinforced plastic laminates
This paper presents the results of an investigation into the fatigue behavior of reinforced concrete beams poststrengthened with carbon fiber reinforced plastic (CFRP) laminates. The 3 and 5 m reinforced concrete beams subjected to monotonic and cyclic loading showed similar behavior in all instances. No drop in CFRP strains was observed in the 5 m beams loaded cyclically to failure. All fatigue failures were initiated by fatigue fracture of one or more of the reinforcing steel bars. The fatigue life of a CFRP strengthened reinforced concrete beam appeared to be at least as long as for an equivalent strength conventionally reinforced concrete beam subjected to the same loads, where that fatigue life is largely dependent on the stress range applied to the steel reinforcement. The results indicated that concrete softening due to repeated loads leads to an increase in the stresses in the tensile steel reinforcement. These increases in steel stresses were not as severe for the CFRP strengthened beams than for the beams without CFRP sheets. No significant degradation in the CFRP sheets or the CFRP to concrete interface occurrred due to cyclic loading, and the basic assumptions for monotonic behavior remained valid for beams loaded cyclically.
Fatigue behavior of reinforced concrete beams strengthened with carbon fiber reinforced plastic laminates
This paper presents the results of an investigation into the fatigue behavior of reinforced concrete beams poststrengthened with carbon fiber reinforced plastic (CFRP) laminates. The 3 and 5 m reinforced concrete beams subjected to monotonic and cyclic loading showed similar behavior in all instances. No drop in CFRP strains was observed in the 5 m beams loaded cyclically to failure. All fatigue failures were initiated by fatigue fracture of one or more of the reinforcing steel bars. The fatigue life of a CFRP strengthened reinforced concrete beam appeared to be at least as long as for an equivalent strength conventionally reinforced concrete beam subjected to the same loads, where that fatigue life is largely dependent on the stress range applied to the steel reinforcement. The results indicated that concrete softening due to repeated loads leads to an increase in the stresses in the tensile steel reinforcement. These increases in steel stresses were not as severe for the CFRP strengthened beams than for the beams without CFRP sheets. No significant degradation in the CFRP sheets or the CFRP to concrete interface occurrred due to cyclic loading, and the basic assumptions for monotonic behavior remained valid for beams loaded cyclically.
Fatigue behavior of reinforced concrete beams strengthened with carbon fiber reinforced plastic laminates
Ermüdungsverhalten von durch Laminierung mit carbonfaserverstärktem Kunststoff verstärkten Stahlbetonträgern
Heffernan, P.J. (author) / Erki, M.A. (author)
Journal of Composites for Construction ; 8 ; 132-140
2004
9 Seiten, 11 Bilder, 6 Tabellen, 17 Quellen
Article (Journal)
English
| British Library Online Contents | 2004
Failure of Concrete Beams Strengthened with Fiber Reinforced Plastic Laminates
| British Library Conference Proceedings | 1999