Flexural capacity of continuous reinforced concrete beams strengthened or repaired by CFRP/GFRP sheets

The flexural strengthening of reinforced concrete (RC) beams by bonding external composite materials has proved to be an effective and convenient technique. Several works, focus on mechanical behaviour of continuous reinforced concrete beam with two spans strengthened by composite materials, were re...

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Bibliographic Details
Published inInternational journal of adhesion and adhesives Vol. 104; p. 102759
Main Authors Ali, Harith, Assih, Jules, Li, Alex
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.01.2021
Elsevier BV
Subjects
Bending moment
Bending moments
Bonding strength
CFRP
Composite materials
Continuous reinforced concrete beam
Failure load
Failure modes
Fiber reinforced polymers
GFRP
Glass fiber reinforced plastics
Mechanical behavior
Mechanical properties
Reinforced concrete
Sheets
Strengthening
Thickness
Strengthening
Mechanical behavior
Continuous reinforced concrete beam
GFRP
Bending moment
CFRP
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Summary:The flexural strengthening of reinforced concrete (RC) beams by bonding external composite materials has proved to be an effective and convenient technique. Several works, focus on mechanical behaviour of continuous reinforced concrete beam with two spans strengthened by composite materials, were reported in literature. This paper presents the flexural capacity of continuous RC beams with three spans strengthened or repaired by bonding carbon or glass fibre reinforced polymer (CFRP or GFRP) sheets. Experimental program consists of eight continuous RC beams strengthened by CFRP or GFRP sheets and one beam of reference. The dimension is the same for all beams with a length 9 m and a section 15x25 (cm). Experimental tests with monotonic loading were carried out by varying damaged level of the beams, composite material type and strengthening thickness. Five failure modes of strengthening beams were observed. The results show that the ultimate bending moment of the beam can be improved between 14.8 and 26.6% in case of the beams by bonding CFRP sheets and between 7.2 and 11.8% by bonding GFRP sheets. The beam, which was pre-damaged under pre-loading level 100% of the failure load, can be repaired as strengthened continuous RC beam. The optimal strengthening thickness in the positive and negative bending moment region was obtained. The variation of the strain in the positive and negative bending moment was analysed.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2020.102759