Fatigue life of RC beams strengthened with FRP systems

Fibre‐reinforced polymers (FRP) in the form of externally bonded reinforcement have been used successfully in the rehabilitation of concrete structures. Although considerable data has been produced on the performance of strengthened RC structures, the reliability of strengthened structures can be si...

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Bibliographic Details
Published in:Structural concrete : journal of the FIB 2014-06, Vol.15 (2), p.219-228
Main Authors: Meneghetti, Leila Cristina, Garcez, Mônica Regina, da Silva Filho, Luiz Carlos Pinto, Gastal, Francisco de Paula Simões Lopes, Bittencourt, Túlio Nogueira
Format: Article
Language:English
Subjects:
Applied sciences
aramid
Aramids
Beams (structural)
Building structure
Buildings. Public works
Carbon
Construction (buildings and works)
Cracks
Deflection
Durability. Pathology. Repairing. Maintenance
Exact sciences and technology
fatigue
Fatigue (materials)
Fatigue life
fib Model Code 2010
Fiber reinforced plastics
fibre-reinforced polymers
RC beams
Reinforced concrete
Reinforced concrete structure
Repair (reinforcement, strenthening)
Strength of materials (elasticity, plasticity, buckling, etc.)
Structural analysis. Stresses
testing / experiments
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Summary:Fibre‐reinforced polymers (FRP) in the form of externally bonded reinforcement have been used successfully in the rehabilitation of concrete structures. Although considerable data has been produced on the performance of strengthened RC structures, the reliability of strengthened structures can be significantly reduced due to the variability in the FRP properties, especially when the wet layup technique is used. In addition to this, structural engineers are concerned about the durability of FRP‐strengthened structures under extreme loading conditions. Nonetheless, knowledge of the behaviour of strengthened elements under fatigue loading may be important to raise confidence in the strengthening systems. This paper presents the results of an experimental programme developed to investigate the behaviour up to failure of RC beams strengthened with high‐performance carbon and aramid fibre sheets and subjected to static and cyclic loadings in terms of ultimate loads, deflections, cracking behaviour, failure modes and fatigue life by means of loading, crack width and deflection monitoring. Experimental data on fatigue life were used to validate analytical models developed for strengthened and unstrengthened beams.
ISSN:1464-4177
1751-7648
DOI:10.1002/suco.201300017