Repair of heat-damaged SCC cantilever beams using SNSM CFRP strips

Ashteyat, Ahmed M.; Haddad, Rami H.; Obaidat, Yasmeen Taleb

doi:10.1016/j.istruc.2020.01.005

Cited by 15 publications

(8 citation statements)

References 29 publications

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“…Ahmed M.Ashteyat,Rami Haddad,Yasmeen T.Obaidat [24] Investigate the use of side.near.surface.mounted.fiber.reinforced.polymer. (SNSM-CFRP) strips to strengthen or repair heatdamaged cantilever (self-compacting-concrete) beams(SCC).…”

Section: Techniques Of Adding Ns-frpmentioning

confidence: 99%

Repairing and strengthening techniques of RC beams: a review

Hassan,

Latief

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The purpose of this review is to present the techniques for strengthening or repairing of reinforced concrete-beams (RC). The concrete members, like RC beam are might be required to be strengthened to increase the internal strength capacity to resist additional external loads or repaired to increase the design’s structural rigidity and insulate the reinforcement from aggressive conditions. The experimental studies that related to the techniques of repairing and strengthening of RC beams using: external steel plates, fiber reinforced concrete (FRC), reinforced concrete (RC) jacketing, sprayed fiber reinforced polymer FRP, epoxy injection, mortar jackets, near-surface carbon fiber (SNSM-CFRP) strips, near-surface glass fiber (NSM-GFRP) rods, CFRP laminate and sheet; and adding an ultra high performance concrete (UHPC) layer. All the techniques that were discussed showed that there is an improvement in the general behavior of the beams that have been strengthened and repaired, as well as an increase in the maximum load and ductility.

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Section: Techniques Of Adding Ns-frpmentioning

confidence: 99%

Repairing and strengthening techniques of RC beams: a review

Hassan,

Latief

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Several studies investigated the potential use of FRP technique in repairing head damaged RC structures (Alshannag and Alshenawy, 2021;Haddad et al, 2011;Xu et al, 2019;Ashteyat et al, 2020;Roy et al, 2016;Jadooe et al, 2017;Obaidat et al, , 2021b. Alshannag and Alshenawy (2021) studied the flexural behavior of light weight reinforced concrete beam damaged by heat and repaired using FRP sheet.…”

Section: Jsfe 133mentioning

confidence: 99%

“…The EB-CFRP retrofit measures successfully restored the virgin capacity of the beam and were sufficient to also restore most of the lost initial stiffness. Ashteyat et al (2020) investigated the potential of using side near-surface mounted (SNSM) FRP for strengthening/repairing cantilever self-compacting concrete (SCC) beams damaged by heat. Control and heat-damaged cantilever beams were strengthened/repaired using single SNSM-CFRP strips, inserted in two parallel longitudinal man-made side grooves, located at 25 or 60 mm from the beams' top tension fiber.…”

Section: Jsfe 133mentioning

confidence: 99%

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Experimental and analytical investigation of using externally bonded, hybrid, fiber-reinforced polymers to repair and strengthen heated, damaged RC beams in flexure

Rjoub

Obaidat

Ashteyat

et al. 2021

JSFE

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PurposeThis study aims to conduct an experimental study and finite element model (FEM) to investigate the flexural behavior of heat-damaged beams strengthened/repaired by hybrid fiber-reinforced polymers (HFRP).Design/methodology/approachTwo groups of beams of (150 × 250 × 1,200) mm were cast, strengthened and repaired using different configurations of HFRP and tested under four-point loadings. The first group was kept at room temperature, while the second group was exposed to a temperature of 400°C.FindingsIt was found that using multiple layers of carbon fiber-reinforced polymer (CFRP) and glass fiber-reinforced polymer (GFRP) enhanced the strength more than a single layer. Also, the order of two layers of FRP showed no effect on flexural behavior of beams. Using a three-layer scheme (attaching the GFRP first and followed by two layers of CFRP) exhibited increase in ultimate load more than the scheme attached by CFRP first. Furthermore, the scheme HGC (heated beam repaired with glass and carbon, in sequence) allowed to achieve residual flexural capacity of specimen exposed to 400°C. Typical flexural failure was observed in control and heat-damaged beams, whereas the strengthened/repaired beams failed by cover separation and FRP debonding, however, specimen repaired with two layers of GFRP failed by FRP rupture. The FEM results showed good agreement with experimental results.Originality/valueFew researchers have studied the effects of HFRP on strengthening and repair of heated, damaged reinforced concrete (RC) beams. This paper investigates, both experimentally and analytically, the performance of externally strengthened and repaired RC beams, in flexure, with different FRP configurations of CFRP and GFRP.

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“…Consequently, the NSM shear strengthening approach achieved a CFRP impact of 51% and 67% 39 . In References 39,40, the NSM‐GFRP and CFRP rods were used to increase RC beams' flexural and shear strengths 42,43 . The flexural and shear strengths improved by 44% and 106%, related to the un‐strengthened beam.…”

Section: Introductionmentioning

confidence: 99%

Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

Abdo

Sharaky

Ahmed

2023

Structural Concrete

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The reinforced concrete (RC) beams could be upgraded in shear using steel and fiber‐reinforced polymer (FRP) having several shapes (bars, strips, or sheets). Using near‐surface mounted (NSM) Glass FRP (GFRP) bars is still limited compared to carbon FRP (CFRP) elements as shear reinforcement. Moreover, using reinforced high‐strength concrete layers (HSCL) as NSM shear strengthening for the RC beams is still limited. Herein, three RC beams internally reinforced in shear using different shear areas (without, 100 mm stirrups apart, and 200 mm stirrups apart) were experimentally tested as reference beams (CB). Other eight beams strengthened in shear using NSM HSCL, and bars were experimentally tested. Moreover, an extended finite element (FE) simulation was implemented through a verified FE model to study the effect of other NSM aspects on shear‐strengthened beam response. The results explained that, regardless of the internal stirrups area and external NSM characteristics, the shear‐strengthened beams showed higher load efficiency than the corresponding CB. The NSM upgraded shear beam had slightly higher load efficiency than the un‐strengthened beam having the same steel area as internally shear stirrups. Moreover, increasing the internal shear stirrups decreased the total efficiency of the NSM shear strengthening and the internal stirrups regardless of the NSM characteristics. Furthermore, the NSM HSCL was more efficient than the corresponding NSM bars in increasing the load capacity and stiffness of the shear‐strengthened beams. The reported analytical model predicted well the shear capacity of the tested beams.

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Repair of heat-damaged SCC cantilever beams using SNSM CFRP strips

Cited by 15 publications

References 29 publications

Repairing and strengthening techniques of RC beams: a review

Repairing and strengthening techniques of RC beams: a review

Experimental and analytical investigation of using externally bonded, hybrid, fiber-reinforced polymers to repair and strengthen heated, damaged RC beams in flexure

Shear performance of reinforced concrete beams strengthened in shear using NSM bars and reinforced HSC layers

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