New Anchorage Technique for FRP Shear-Strengthened RC T-Beams Using CFRP Rope

El-Saikaly, Georges; Godat, Ahmed; Chaallal, Omar

doi:10.1061/(asce)cc.1943-5614.0000530

Cited by 53 publications

(25 citation statements)

References 9 publications

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“…This material was intentionally chosen due to its high flexibility and potential for better anchorage. It consists of a bundle of flexible CFRP fibers, which are held together by a thin net (El-Saikaly et al 2014). According to the manufacturer's product data sheet, the nominal cross section area, ultimate rupture strain and tensile modulus of CFRP rope are 28 mm 2 , 1.6% and 240 GPa.…”

Section: Retrofit Design and Applicationmentioning

confidence: 99%

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Flexural retrofit of support regions of reinforced concrete beams with anchored FRP ropes under reversed cyclic loading

Kaya¹,

Çavunt²,

Cavunt³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Many studies have been conducted for enhancing the positive moment capacity of the mid-span areas of reinforced concrete (RC) beams strengthened with fiber reinforced polymer (FRP) reinforcement under monotonic increasing loads. However under seismic actions, the support regions of beams may also require retrofitting. In such cases, retrofitting should be effective under reversed cyclic flexural actions. According to the best knowledge of authors, there is no study investigating this important issue in the literature. Therefore, the present study focuses on retrofitting of beam support regions under reversed cyclic flexural moments. As the initial stage of a more comprehensive testing program, three full-scale RC beam-column-slab sub-assemblages were tested. The sub-assemblages also included a part of transverse beams perpendicular to the main beam tested. One specimen was tested as a reference specimen while the remaining two specimens were tested after being retrofitted with near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) ropes with two different details in terms of anchorage of the CFRP ropes into joint region. The anchorage of CFRP ropes was provided by NSM application over the slab next to the column in one of the specimens, while CFRP rope was anchored by epoxy adhesive within the joint core by embedding it through a drilled hole on the column in other specimen. The effectiveness of the proposed anchoring methods was investigated through experimentally. The findings of the study indicated that the specimen retrofitted with NSM anchoring method achieved a remarkable enhancement in flexural capacity, whereas, anchoring through embedment of the CFRP rope within the epoxied drilled hole was not that successful. KEYWORDSAnchorage, embedment through section (ETS), flexure, near surface mounted (NSM), reinforced concrete beam, carbon fiber reinforced polymer (CFRP) rope.

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Section: Retrofit Design and Applicationmentioning

confidence: 99%

“…Since it is a new material, very few studies were conducted with CFRP ropes for concrete confinement and enhancement of shear capacity of beams (Rousakis 2013;El-Saikaly et al 2014). In the published literature, no study was found on enhancement of flexural capacity of beams with CFRP ropes except the work done by (Kaya 2014, Kaya et al).…”

Section: Introductionmentioning

confidence: 99%

Flexural retrofit of support regions of reinforced concrete beams with anchored FRP ropes under reversed cyclic loading

Kaya¹,

Çavunt²,

Cavunt³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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“…El-Saikaly et al [32] had tested an anchor that consisted of CFRP robes overlapping with CFRP L-strips through drilled holes all the way in the web of the beam simulating fully wrapped mode. e anchor was proved to be effective; however, it imposes a great risk of cutting a shear link while drilling and it requires hard effort for drilling.…”

Section: Introductionmentioning

confidence: 99%

Embedded Connector in Severe Optimization of Steel Plate for Shear Strengthening of RC Beam: Experimental and Numerical Investigations

Alam

Bakkar

Onik

et al. 2018

Advances in Civil Engineering

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Environmental impact has become one of the major factors taken into consideration for recent civil engineering studies and projects. us, researchers have been concentrating on shear strengthening of existing reinforced concrete structure as an upgrade method instead of demolishing and reconstructing. In general, shear strengthening of RC beams using externally bonded steel plate has gained huge popularity. However, premature debonding of plates is the main drawback of the system, which could be mitigated using embedded connector; thus, the dimension of steel plate could be reduced significantly. Furthermore, numerical analysis on shear strengthening of beams using embedded connector would provide a great insight on the structural behavior. e aim of this research is to severely reduce the dimension of the steel plate using embedded connector for shear strengthening of RC beams and to investigate the performances of optimized shear-strengthened beams through experimental and numerical investigations. e results showed that the dimension of plate was reduced without debonding of the plate if the beam was designed for shear strengthening with the consideration of yield strength of steel plate and shear link. Experimental results showed a maximum increase in failure of 24%. e numerical results predicted accurately the structural performance of beams. e embedded connector had a great effect in deferring and minimizing the debonding failure and accordingly increasing the maximum load of shear failure between 14.5% and 24% compared to control beam.

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“…Anchorage of FRP shear-strengthened beams with CFRP rope is a new and practical anchorage technique that does not use mechanical anchors and provides a cost-effective solution. An earlier study that examined the feasibility of this technique for FRP shear-strengthened RC beams 20 showed that the gain in strength due to CFRP rope was 34%. The investigation of bond mechanism of CFRP rope was carried out in parallel to El-Saikaly et al 20 experimental tests.…”

Section: Introductionmentioning

confidence: 99%

“…An earlier study that examined the feasibility of this technique for FRP shear-strengthened RC beams 20 showed that the gain in strength due to CFRP rope was 34%. The investigation of bond mechanism of CFRP rope was carried out in parallel to El-Saikaly et al 20 experimental tests. The width of the CFRP L-strips is identical to the one used in the tests of FRP shear-strengthened beams.…”

Section: Introductionmentioning

confidence: 99%

Bond mechanism of a new anchorage technique for FRP shear-strengthened T-beams using CFRP rope

Godat

Prowt

Chaallal

2015

Journal of Reinforced Plastics and Composites

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Carbon fiber-reinforced polymer (CFRP) rope was recently developed to anchor fiber-reinforced polymers (FRP) shearstrengthened beams that conventionally uses U-wrap scheme. The rope is a bundle of flexible CFRP strands held together by a thin tissue net. In this technique, holes are drilled through the web at the web-flange intersection, and CFRP ropes are inserted through the holes and flared onto the two free ends of the U-wrap scheme. The technique offers substantial improvements in bond strength and ductility because it converts the U-wrap scheme similar to a full-wrap scheme. The objective of this paper was to investigate the bond behavior of CFRP L-strip plates anchored with CFRP ropes. The experimental program consisted of 16 tests on FRP-to-concrete joints, of which six were unanchored (control specimens) and 10 were anchored by CFRP ropes. The influence of concrete strength, rope length, and plate width on bond behavior was examined. Experimental results showed that the bond performance greatly improved with increasing FRP plate width and rope length, but concrete strength had a negligible effect, which is attributed to high thickness and narrow width of CFRP L-strips used. Theoretical formulations provided to account for the ultimate bond load were compared with the experimental results, and a modification factor to estimate the effect of the presence of CFRP rope was suggested.

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New Anchorage Technique for FRP Shear-Strengthened RC T-Beams Using CFRP Rope

Cited by 53 publications

References 9 publications

Flexural retrofit of support regions of reinforced concrete beams with anchored FRP ropes under reversed cyclic loading

Flexural retrofit of support regions of reinforced concrete beams with anchored FRP ropes under reversed cyclic loading

Embedded Connector in Severe Optimization of Steel Plate for Shear Strengthening of RC Beam: Experimental and Numerical Investigations

Bond mechanism of a new anchorage technique for FRP shear-strengthened T-beams using CFRP rope

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