Experimental Analysis of RC Elements Strengthened with CFRP Strips

Vuković, N. K.; Jevrić, Marija; Zejak, Radomir

doi:10.1007/s11029-020-09861-x

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…Regardless of the severity of the cracking that existed before the repair stage, the CFRP strengthening system significantly improved flexural capacity [20]. When strengthening simply supported RC beams with CFRP strips, the CFRP strip does not need to reach farther than half the span length; therefore, lateral anchorages are unnecessary [21]. The CFRP debonding is delayed to some degree thanks to the end anchorages that are a part of the CFRP repair system [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Damage Severity and Flexural Steel Ratio on CFRP Repaired RC Beams

Fayyadh

Razak

2023

Sustainability

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The study aims to investigate the effectiveness and failure modes of using CFRP-bonded sheets as a flexural repair system for RC beams, considering the effect of pre-repair damage levels and flexural steel design limits. This study investigated two different flexural design criteria: RC beams reinforced with the minimum flexural steel limit (ρmin) and RC beams reinforced with the maximum flexural steel limit (ρmax). Additionally, three pre-repair damage levels were considered: design limit load, steel yield limit load, and failure limit load. The study results showed that the RC beams’ repair effectiveness depends on the ratio of the flexural steel provided. Specifically, the beams with a minimum steel ratio demonstrated a higher capacity restoration of 49% to 85% (corresponding to the pre-repair damage level, i.e., design load to failure load), while beams with a maximum steel ratio only achieved a capacity restoration of 15.3% to 28.4%. Regarding failure modes, the beams experienced an intermediate-induced crack (IC) debonding due to pre-repair flexural cracks. Despite the debonding of the CFRP sheets, the beams still had the ability to withstand loads close to their unrepaired capacity. This indicates the possibility of re-repairing the beams after the CFRP debonding. Overall, the findings of this study can be used in the industry to repair RC beams and girders that have been damaged due to extreme loading conditions or other reasons. By using CFRP externally bonded sheets, the capacity of the structures can be restored regardless of the pre-repair damage level and the flexural steel design criteria.

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Section: Introductionmentioning

confidence: 99%

Effect of Damage Severity and Flexural Steel Ratio on CFRP Repaired RC Beams

Fayyadh

Razak

2023

Sustainability

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“…Интерес к конструкционному поведению железобетонных конструкций, упрочненных ВАПМ, обусловливает проведение многочисленных исследований [4,5,[8][9][10][11][12][13][14]. Например, экспериментальные результаты [10] показали, что использование листов из стеклопластика с разными схемами упрочнения при изгибе, сдвиге, изгибе со сдвигом не только увеличивает нагрузку растрескивания, максимальную несущую способность, общую жесткость и пластичность железобетонных балок, но и позволяет управлять развитием трещин в бетоне.…”

Section: Introductionunclassified

Конечно-Элементный Анализ Железобетонных Балок, Упрочненных U-Образными Обмотками Волокнисто-Армированного Углепластика

Нгуен¹,

Нгуен²,

Ду³

et al. 2022

mkm

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Разработаны трехмерные конечно-элементные модели для двух железобетонных балок, упрочненных волокнисто-армированным углепластиком, достоверность применения которых проверена с помощью экспериментальных данных. Механизм разрушения представлен как переход от разрушения сдвиг—растяжение в контрольной балке к сдвиг—сжатие в упрочненных балках. Для определения влияния количества слоев в U-образной углепластиковой обмотке и количества обмоток на сдвиговые характеристики и прочность при сжатии железобетонных балок выполнены параметрические исследования.

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