Repair and strengthening of RC flat slab bridges using CFRPs

Haritos, N; Hira, A.

doi:10.1016/j.compstruct.2004.05.003

Cited by 8 publications

(2 citation statements)

References 1 publication

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“…In fact, the beams to be strengthened usually have served for a long term on-site, and cracks may have occurred. It is evidenced that the flat slab bridge in service generally works with cracks (Haritos and Hira, 2004). The initial cracks can cause stress concentration after strengthening and lead to the debonding failure (He, 2007).…”

Section: Introductionmentioning

confidence: 99%

Using end buckles to improve debonding resistance in FRP-bonded precracked RC beams

Zhou

Chen

Wang

et al. 2022

Advances in Structural Engineering

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The strengthening effect of reinforced concrete (RC) members externally bonded (EB) with fiber reinforced polymer (FRP) laminates is significantly affected by interfacial debonding failure. To improve the connection between FRP sheets and concrete, a novel type of anchor device for FRP sheets called buckle was proposed in this study. This device can effectively lock the end of the sheet using a patented method of wrapping. In addition to conventional external bonding, bolts were installed on the buckles to form hybrid anchored (HA) FRP sheet. To verify the effectiveness of this new method, a precracked RC beam was prepared in comparison with two undamaged beams strengthened with EB or HA FRP sheets. As observed, end buckles can limit the development of cracks regardless of initial cracking. Despite the occurrence of intermediate debonding due to initial cracks, both the ultimate capacity and failure ductility were significantly improved. Owing to the end buckles, the debonding resistance was excellent, and the initial cracking of the beam hardly affected the strengthening effect. In addition, existing formulas were used to calculate the lower limit of the ultimate load of the specimen strengthened with HA FRP, which was still higher than that of the specimen strengthened by EB FRP. Therefore, the results confirmed that the debonding resistance was greatly enhanced due to the locking of the FRP sheet via end buckles, and the proposed method is useful to guarantee the strengthening effect.

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Section: Introductionmentioning

confidence: 99%

Using end buckles to improve debonding resistance in FRP-bonded precracked RC beams

Zhou

Chen

Wang

et al. 2022

Advances in Structural Engineering

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“…Meanwhile, the adhesively bonded CFRP has already become successful in the repair and strengthening of reinforced-concrete structures [3, 9,10]. This has recently led to an immense interest in the sphere of research focusing on the use of CFRP materials for the strengthening and repair of metallic structures [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Utjecaji orijentacije slojeva CFRP traka na ojačanje šupljih čeličnih elemenata

2015

JCE

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This paper studies the effects of orientation of CFRP (carbon fibre reinforced polymer) strip layers on the improvement of bearing capacity of strengthened steel-made circular hollow elements. The four point bending test was conducted, and elements were subjected to bending until failure. The improvement of bearing capacity of strengthened tubular steel elements is presented in terms of failure load, stiffness, composite beam action, and modes of failure. Beams strengthened with CFRP strips with two longitudinal layers and one layer along the periphery performed better than the beams reinforced with one longitudinal layer and two layers along the periphery. Utjecaji orijentacije slojeva CFRP traka na ojačanje šupljih čeličnih elemenata U ovom se radu proučavaju utjecaji orijentacije slojeva CFRP traka (polimera ojačanih ugljičnim vlaknima) na poboljšanje nosivosti ojačanih čeličnih kružnih šupljih elemenata. Provedeno je ispitivanje savijanjem uz djelovanje sila u četiri točke, a elementi su opterećeni na savijanje do sloma. Poboljšanje nosivosti ojačanih cijevnih čeličnih elemenata analizirano je s obzirom na silu otkazivanja, krutost, kompozitno djelovanje i vrstu sloma. Nosači armirani CFRP trakama s dva uzdužna sloja i jednim po obodu pokazuju bolje ponašanje od nosača armiranih s jednim uzdužnim slojem i dva sloja po obodu.

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