Innovative Repair Technique for RC Beams Predamaged in Shear

Hussein, Mohamed; Afefy, Hamdy M.; Khalil, Ali

doi:10.1061/(asce)cc.1943-5614.0000404

Cited by 23 publications

(12 citation statements)

References 11 publications

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“…Most of the failures of the tested beams occurred in the concrete thin layer adjacent to the sheet (in direct contact with the FRP sheet), not in the adhesive epoxy (Fig. 6) (Hussein et al 2013). …”

Section: Cracking Behaviorsmentioning

confidence: 99%

“…The advantage of this technique is the speed of the upgrading process, which makes the technique more economical in most cases compared with other strengthening techniques, such as concrete jacketing or complete replacement of the member. More importantly, this repair technique can be performed while the structure is still in use (Hussein et al 2013). Within the past decade, there has been numerous studies conducted regarding the strength and behavior of RC deep beams with openings (Ashour and Rishi 2000;Campione and Minafò 2012;El Maaddawy and Sherif 2009;Mansur and Alwis 1984;Shanmugam and Swaddiwudhipong 1988;Zhang et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Repair of Pre-cracked Reinforced Concrete (RC) Beams with Openings Strengthened Using FRP Sheets Under Sustained Load

Osman

et al. 2017

Int J Concr Struct Mater

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Strengthening reinforced concrete (RC) beams with openings by using aramid fiber reinforcement polymers (AFRP) on the beams' surfaces offers a useful solution for upgrading concrete structures to carry heavy loads. This paper presents a repairing technique of the AFRP sheets that effectively strengthens RC beams, controls both the failure modes and the stress distribution around the beam chords and enhances the serviceability (deflection produced under working loads be sufficiently small and cracking be controlled) of pre-cracked RC beams with openings. To investigate the possible damage that was caused by the service load and to simulate the structure behavior in the site, a comprehensive experimental study was performed. Two unstrengthened control beams, four beams that were pre-cracked before the application of the AFRP sheets and one beam that was strengthened without pre-cracking were tested. Cracking was first induced, followed by repair using various orientations of AFRP sheets, and then the beams were tested to failure. This load was kept constant during the strengthening process. The results show that both the preexisting damage level and the FRP orientation have a significant effect on strengthening effectiveness and failure mode. All of the strengthened specimens exhibited higher capacities with capacity enhancements ranging from 21.8 to 66.4%, and the crack width reduced by 25.6-82.7% at failure load compared to the control beam. Finally, the authors present a comparison between the experimental results and the predictions using the ACI 440.2R-08 guidelines.

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Section: Cracking Behaviorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Repair of Pre-cracked Reinforced Concrete (RC) Beams with Openings Strengthened Using FRP Sheets Under Sustained Load

Osman

et al. 2017

Int J Concr Struct Mater

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“…Researchers [64] also repaired the shear cracks developed in a damaged beam by externally applying a prestressed force and strengthened it by using a U-wrapped CFRP system, which resulted in a 57% increase in the load carrying capacity. With an anchorage system, the increase in the capacity could be more pronounced, can be 75-82.2%, as reported in previous researches [65,66].…”

Section: Shear Strengtheningmentioning

confidence: 99%

Performances, challenges and opportunities in strengthening reinforced concrete structures by using FRPs – A state-of-the-art review

Siddika

Mamun

Ferdous

et al. 2020

Engineering Failure Analysis

165

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“…About 11,9% and 7,7% increase in load capacity were observed after wrapping a RC beam with a 45° oriented CFRP sheet and a bidirectional CFRP sheet, respectively (Singh 2013). CFRP strengthening was also applied to repair shear cracks developed in a damaged beam by externally applying a prestressing force, which resulted in a 57,0% increase in load carrying capacity (Hussein, Afefy, and Khalil 2013). It was proved that, the ultimate shear capacity of the strengthened beam can be effectively increased by 82,2%, when no internal stirrup used in the critical shear area (Ebead and Saeed 2017).…”

Section: Introductionmentioning

confidence: 99%

Shear Reinforcement with Glass Fibre Polymer in Reinforced Concrete Beams

Arcenego

Pessi

Wanderlind

et al. 2022

UPjeng

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Reinforcement of a structure is necessary in unpredictable changes or also for rehabilitation, due to exposure to weather conditions, causing considerable damage that can lead to the collapse of the structure. The present study aims to evaluate the behavior of the strengthening with sheets of glass fiber reinforced polymer (GFRP) with thicknesses of 3 mm, bonded with structural epoxy-based adhesive applied in the shear area of reinforced concrete beams, spaced in three different configurations and bonded on the two faces of the beam. The beams were cracked previously to simulate a damaged structure and strengthened later to obtain the maximum load of rupture after the application of the strengthening. With the obtained results it can be verified an increase of ductility in the reinforced concrete beams. The increase of the load capacity was obtained in the beams with strengthening with smaller spacing between the sheets.

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Innovative Repair Technique for RC Beams Predamaged in Shear

Cited by 23 publications

References 11 publications

Repair of Pre-cracked Reinforced Concrete (RC) Beams with Openings Strengthened Using FRP Sheets Under Sustained Load

Repair of Pre-cracked Reinforced Concrete (RC) Beams with Openings Strengthened Using FRP Sheets Under Sustained Load

Performances, challenges and opportunities in strengthening reinforced concrete structures by using FRPs – A state-of-the-art review

Shear Reinforcement with Glass Fibre Polymer in Reinforced Concrete Beams

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