CFRP Mechanical Anchorage for Externally Strengthened RC Beams under Flexure

Ali, Alnadher; Abdalla, Jamal A.; Hawileh, Rami A.; Galal, Khaled

doi:10.1016/j.phpro.2014.07.002

Cited by 84 publications

(29 citation statements)

References 5 publications

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“…In addition, the effectiveness of using FRP sheets is governed by its debonding strain [6]. In order to postpone the debonding process and increase the strengthening efficiency, mechanical anchor systems or CFRP Uwrapped anchors have been used and showed high effectiveness for both traditional RC beams [25][26][27][28][29] and PC beams [11,12]. ACI 440.2R-17 [21] also recommended that properly applying FRP U-wrapped anchors can maximize the actual strain of FRP systems.…”

Section: Introductionmentioning

confidence: 99%

Flexural-strengthening efficiency of cfrp sheets for unbonded post-tensioned concrete T-beams

Nguyen-Minh

Phan-Vu

Tran

et al. 2018

Engineering Structures

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There has been a limited number of studies about the flexural behavior of unbonded posttensioned concrete (UPC) beams strengthened with carbon fibre reinforced polymer (CFRP) and these studies have not systematically examined the effect of CFRP sheets on the tendon strain as well as the strengthening efficiency. Moreover, current design guides for the FRP strengthening techniques have not provided any design procedure for UPC structures. This study, thus, investigates the influence of CFRP sheet ratio on the flexural behavior of CFRPstrengthened UPC T-beams and quantifies its effect upon tendon behavior in this kind of UPC beams. The testing program consisted of nine large-scale UPC T-beams strengthened by different layers of CFRP sheets with or without CFRP U-wrapped anchors. The experimental results have shown that the use of CFRP sheets and CFRP U-wrapped anchors significantly affected the tendon strain. The FRP reinforcement ratio governed the flexural capacity, the crack width, the mid-span displacement, and the ductility of the beams in which the

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Section: Introductionmentioning

confidence: 99%

Flexural-strengthening efficiency of cfrp sheets for unbonded post-tensioned concrete T-beams

Nguyen-Minh

Phan-Vu

Tran

et al. 2018

Engineering Structures

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“…The corresponding strength gains of Pi-shaped and Fan and Dowel anchors were 214.98% and 211.17% which comply with the previous research findings. Strength gains ranging from 18.6% to 68.7% have been reported for anchored CFRP/concrete composites compared to CFRP strengthened beams [16,17]. …”

Section: Finite Element Modeling Of Cfrp Anchorsmentioning

confidence: 99%

Investigation on Enhancing Flexural Performance of CFRP Strengthened Concrete Beams

Gamage¹,

Ariyachandra²

2015

Second International Conference on Advances in Civil, Structural and Mechanical Engineering - ACSM 2015

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Abstract-Strengthening of reinforced concrete structures is inevitable to preserve structural integrity and protracted service life due to the effects of numerous elements contained within the natural or artificial environment surrounding it. Carbon Fibre Reinforced Polymer (CFRP) composites have been progressively more utilized for decades as a strengthening material due to its outstanding characteristics such as high strength to weight ratio, reduced weight, excellent resistance to corrosion and environmental degradation and ease of handling during construction which have distinguished it well apart from the other strengthening techniques. However, the ultimate load capacity of CFRP strengthened concrete composites is comparatively lower than CFRP material due to premature debonding which reported as the most frequently observed failure mode in CFRP/concrete composites. In the current study, alternative bonding techniques were investigated to achieve enhanced bond performance by delaying premature debonding failure. A total of 18 CFRP strengthened concrete beams with different bonding techniques were tested using three point bending test. The test results show convincing evidence on strength enhancements. Moreover, a numerical model was also developed to inspect the performance of existing CFRP anchors. Finally, a parametric study was carried out and a new type of anchor; "Tri-leg anchor" is introduced. This paper summarizes the overview of the test programme, finite element modeling, results and analysis.

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“…Previous research has proven the effectiveness of externally-bonded sheets in structural retrofitting and strengthening [24,25]. The external sheet can be bonded to the concrete surface by constructional adhesive, or additionally fastened mechanically to result in a more effective hybrid jointing [26,27]. As an illustration, Figure 1 demonstrates the efficiency of steel fibres in preventing the formation of splitting cracks in concrete prisms bonded with external carbon fibre-reinforced polymer (CFRP) sheets [28].…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Fibre Reinforced Concrete Elements: Synergy of the Fibres and External Sheet

Gribniak

Tamulenas

et al. 2019

Sustainability

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In structural rehabilitation and strengthening, the structural members are often required to cope with larger design loading due to the upgrading of building services and design standard, while maintaining the member size to preserve the architectural dimensions and headroom. Moreover, durability enhancement by mitigating or eliminating the reinforcement corrosion problem is often desired. Concrete cracking is a major initiating and accelerating factor of the corrosion of steel reinforcement. The application of fibres is a prominent solution to the cracking problem. Furthermore, the fibres can increase the mechanical resistance of the strengthening systems. This study reveals the synergy effect of the combined application of steel fibres and external carbon fibre-reinforced polymer (CFRP) sheets. The investigation encompasses the use of fibre-reinforced polymer (FRP) reinforcing bars, discrete steel fibres, externally bonded and mechanically fastened FRP sheets in different combinations. It is discovered that the steel fibres can help to control concrete cracking and eventually alter the failure mode and enhance the flexural resistance. The FRP reinforcement system, together with the steel fibres, radically resolves the structural safety problem caused by corrosion of the steel bar reinforcement. Finally, the impact of the external sheet on the fire limit state performance needs to be resolved, such as by adopting fire protection rendering for the finishes layer.

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CFRP Mechanical Anchorage for Externally Strengthened RC Beams under Flexure

Cited by 84 publications

References 5 publications

Flexural-strengthening efficiency of cfrp sheets for unbonded post-tensioned concrete T-beams

Flexural-strengthening efficiency of cfrp sheets for unbonded post-tensioned concrete T-beams

Investigation on Enhancing Flexural Performance of CFRP Strengthened Concrete Beams

Strengthening of Fibre Reinforced Concrete Elements: Synergy of the Fibres and External Sheet

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