Cracking behavior of reinforced concrete beams strengthened with CFRP anchorage system under cyclic and monotonic loading

Zheng, Yonglai; Zhou, Yubao; Pan, Tanbo; Zhang, Qin; Liu, Don

doi:10.1016/j.engstruct.2020.110222

Cited by 23 publications

(10 citation statements)

References 37 publications

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“…As a result, it is important to ensure that repaired structures have sufficient load-bearing capacity under both static and repeated loading conditions. Many studies focused on studying the static and fatigue loading performance of damaged RC beams strengthened with fiber-reinforced polymer [17][18][19][20] and ultra-highperformance concrete sheets [13,21]. The strengthening sheets made of polymers and cementitious composites are externally bonded to the tension side of RC beams with and without adhesives.…”

Section: Introductionmentioning

confidence: 99%

“…The load-bearing capacity of the damaged structures was improved due to the increased cross-sectional area introduced by the externally bonded sheets. The effectiveness of using strengthening sheets is dependent on the use of sheet anchors [17], number of sheet layers [19], size of repair [21], and material properties of sheet layers [13].…”

Section: Introductionmentioning

confidence: 99%

“…Most studies [17][18][19][20][21] have found that externally bonded layers can effectively recover the load-bearing capacity of damaged beams and in some cases [20], the strengthened beams outperformed the undamaged beams. However, using externally bonded sheets could be limited when the deteriorated concrete and corroded steel reinforcement need to be removed prior to repair.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Flexural Performance of Repaired Reinforced Concrete Beams under Static and Repeated Loading Using Non-Destructive Methods

Wang

Gupta

2022

Materials

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Deterioration of concrete structures is one of the major issues faced by the construction industry. Repair and rehabilitation are necessary to extend the service life of such structures. This study aims to investigate the effect of repair material type, length of repaired region, and loading regime on the structural characteristics of the repaired reinforced concrete (RC) beams. To achieve this goal, a total of 30 repaired and non-repaired RC beams were prepared and tested under static and repeated loading conditions. Three types of sounding-based non-destructive test (NDT) methods are employed to determine the material deterioration and sub-surface delamination after repeated loading. Results showed that under static loading conditions, full-length repaired beams had better performance than 1/3-span repaired beams. Beams repaired with cementitious repair mortar containing modified binder and cementitious repair concrete in full length had a yield strength that was 14% and 9%, respectively, higher than that of beams repaired in 1/3 span. All RC beams with full-span repair outperformed the intact beams. After repeated loading, beams repaired with cementitious repair with modified binder over full length showed a 14% improvement in yield strength compared to control samples. It was found that repair materials that had a high compressive and flexural strength are beneficial. The resonant frequency drops correlate well with the yield strength results. The formulas proposed by Canadian Standards Association (CSA) 23.3 can effectively predict the moment resistance of both intact (control) and repaired RC beams. The ratio of experimental moment resistance values to its predictions ranges from 0.91 to 1.04.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluating Flexural Performance of Repaired Reinforced Concrete Beams under Static and Repeated Loading Using Non-Destructive Methods

Wang

Gupta

2022

Materials

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“…The review of past studies shows that the NSM shear strengthening of prestressed concrete beams with different bonding materials has not been explored in detail [26][27][28][29][30][31]. However, the effectiveness of organic resins such as epoxy and vinyl ester are compromised when exposed to elevated temperature and extreme weather conditions.…”

Section: Methodsmentioning

confidence: 99%

Experimental Study on the Effectiveness of Inorganic Bonding Materials for Near-Surface Mounting Shear Strengthening of Prestressed Concrete Beams

Kuntal

Chellapandian

Prakash

et al. 2020

Fibers

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Use of organic resins such as epoxy and vinyl esters as bonding materials in fibre reinforced polymer (FRP) strengthening of concrete members is widely accepted. However, the performance of organic resins is compromised when exposed to high temperature and extreme weather conditions leading to reduced durability of the strengthened systems. The present study attempts to evaluate the effectiveness of inorganic (cement mortar and geopolymer mortar) bonding materials for shear strengthening of prestressed concrete (PSC) beams using the near-surface mounting (NSM) technique. Different types of bonding materials are used in this study for NSM shear strengthening including: (i) epoxy resin, (ii) high strength cement grout (HSCG) and (iii) geopolymer mortar. Bond tests were first conducted to evaluate the pull-out/bond strength of different bonding materials. Bond tests revealed that epoxy resin had the highest bond strength followed by geopolymer mortar and HSCG. Sixteen full-scale PSC beams were cast with and without stirrups. The beams were strengthened using NSM CFRP laminates oriented at 45-degree configuration and then tested under a three-point bending configuration. Experimental results revealed that the performance of high strength cement grout and geopolymer mortar was similar but with a lesser efficiency compared to the epoxy resin.

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“…The superiority of FRPs over conventional materials like steel can be attributed to their numerous advantages, including exceptionally high strength-to-weight ratios, adaptability, and resistance to electrochemical corrosion (ACI Committee 440.2R-17, 2017). Also, several types of research dealt with the strengthening of reinforced concrete beams using various methods and different materials (Banjara and Ramanjaneyulu, 2019; Talib et al, 2017; Wang and Gupta, 2021; Zhang et al, 2020; Zheng et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of strengthening by carbon fiber reinforced polymer sheets on the flexural behavior of reinforced self-compacting concrete beams under repeated loads

Abbas AL-Khafaji,

Muhammed,

Jadooe

et al. 2024

Advances in Structural Engineering

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This study investigates the effect of strengthening self-compacted concrete (SCC) beams using CFRP sheets on flexural behaviour subjected to repeated loads. During the experiment, six rectangular reinforced SCC beams were evaluated; two were reference beams without strengthening, while the remaining four were strengthened with CFRP sheets. The beam’s length, depth, and width are 2100 mm, 300 mm, and 200 mm, respectively. A monotonic load was applied to one of the reference beams, while repeated loads were applied to the remaining (compression cyclic loads). The main parameters studied in this experimental work were the type of loading (monotonic and repeated), the positions of strengthening and the dimensions of CFRP sheets. The flexural behaviour of these beams was investigated through experimental examination by recording the ultimate load and maximum deflection. Meanwhile, the cracks’ pattern and failure modes were observed. The findings of the present study demonstrated that the limited cycles of repeated loads have marginal effect on the flexural behaviour of the beams. This results in an ultimate load reduction of no more than 11%. It was also noted that SCC beams strengthened using CFRP sheets subjected to repeated loads significantly affected the flexural behaviour of these beams. Consequently, the ultimate load of the strengthened beams was improved by up to 18%. Besides, the maximum deflection of the strengthened SCC beams was reduced by 45% compared to those without strengthening. Using strengthening throughout the beams’ entire width and length that are subjected to repeated loads improved their ultimate load to surpass that of non-strengthened beams under monotonic loads by as much as 7%.

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Cracking behavior of reinforced concrete beams strengthened with CFRP anchorage system under cyclic and monotonic loading

Cited by 23 publications

References 37 publications

Evaluating Flexural Performance of Repaired Reinforced Concrete Beams under Static and Repeated Loading Using Non-Destructive Methods

Evaluating Flexural Performance of Repaired Reinforced Concrete Beams under Static and Repeated Loading Using Non-Destructive Methods

Experimental Study on the Effectiveness of Inorganic Bonding Materials for Near-Surface Mounting Shear Strengthening of Prestressed Concrete Beams

Effect of strengthening by carbon fiber reinforced polymer sheets on the flexural behavior of reinforced self-compacting concrete beams under repeated loads

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