Assessment of the existing models to evaluate the shear strength contribution of externally bonded frp shear reinforcements

Oller, Eva; Kotynia, Renata; Bernat, Antonio Ricardo Marí

doi:10.1016/j.compstruct.2021.113641

Cited by 18 publications

(4 citation statements)

References 79 publications

(126 reference statements)

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“…In the framework of TG1, Oller and Kotynia presented in [39] an analysis of the performance of different existing formulations to quantify the FRP contribution to the shear strength of RC elements strengthened in shear by externally bonded FRP sheets [16,[18][19][20]24,[40][41][42][43][44][45][46][47][48]. A large database of 555 tests (355 with rectangular section and 200 with Tsection) has been assembled distinguishing between the shape of the section, the existence of internal transverse reinforcement and the FRP configurations.…”

Section: 𝑛 𝑖𝑛𝑡𝑒𝑔𝑒𝑟mentioning

confidence: 99%

Strengthening Existing Concrete Structures with Fibre Reinforced Polymers (FRP) in the New Version of Eurocode 2

Oller¹,

Diego²,

Torres³

et al. 2022

hya

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This paper aims to introduce the content of Annex J “Strengthening of Existing Concrete Structures with CFRP” of Eurocode 2 [1]. This is first time that the design of adhesively bonded reinforcement with CFRP has been introduced in the European regulations through an informative annex. Annex J considers two different bonded strengthening techniques: externally bonded reinforcement (EBR) that consists of bonding CFRP strips or sheets to the surface of concrete elements, and near surface mounted reinforcement (NSM) that consists of embedding a CFRP strip or rod to a slot cut in the concrete cover. Since, the content of Annex J is new, asummary and background related to all aspects required for designing CFRP strengthened systems for concrete structures, are given in this paper.

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Section: 𝑛 𝑖𝑛𝑡𝑒𝑔𝑒𝑟mentioning

confidence: 99%

Strengthening Existing Concrete Structures with Fibre Reinforced Polymers (FRP) in the New Version of Eurocode 2

Oller¹,

Diego²,

Torres³

et al. 2022

hya

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“…Shear strength is vital in many projects (Gosbell and Meggs, 2002;FIB. FRP Reinforcement in RC Structures, 2007;Oller et al, 2021). The fiber-reinforced polymer (FRP) sheets have various benefits over steel plates.…”

Section: Introductionmentioning

confidence: 99%

Reliable machine learning for the shear strength of beams strengthened using externally bonded FRP jackets

et al. 2023

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All over the world, shear strengthening of reinforced concrete elements using external fiber-reinforced polymer jackets could be used to improve building sustainability. However, reports issued by the American Concrete Institute called for heavy scrutiny before actual field implementation. The very limited number of proposed shear equations lacks reliability and accuracy. Thus, further investigation in this area is needed. In addition, machine-learning techniques are being implemented successfully to develop strength models for complex problems including shear, flexure, and torsion. This study aims to provide a reliable machine-learning model for reinforced concrete beams strengthened in shear using externally reinforced fiber polymer sheets. The proposed model was developed and validated against the experimental database and the very limited models in existing literature. The model showed better agreement with the experimentally measured strength compared to the previous models, which accounted for the effect of various parameters including but not limited to: the element geometry, strengthening details, and configurations. The model could guide the further developments of design codes and mechanical models.

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“…The side-wrapping scheme is not considered here because it does not provide a significant increment in the shear capacity of FRP-strengthened RC beams. To avoid debonding failure, a proper anchorage length or proper mechanical connector that prevents debonding between the FRP and the concrete surface should be provided [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Cross-Section Shape and FRP Reinforcement Layout on Shear Capacity of Strengthened RC Beams

2022

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The evaluation of the shear capacity of an FRP-strengthened reinforced-concrete beam is challenging due to the complex interaction between different contributions provided by the concrete, steel stirrup and FRP reinforcement. The shape of the beam and the FRP inclination can have paramount importance that is not often recognized by the models that are suggested by codes. The interaction among different resisting mechanisms has a significant effect on the shear capacity of beams, since it can cause a reduction in the efficiency of some resisting mechanisms. A comparative study of the performance in the shear resistance assessment provided by three models with six different effectiveness factors (R) is performed, considering different cross-section shapes, FRP wrapping schemes, inclination and anchorage systems. The results revealed that the cross-section shape, the FRP inclination and the efficiency of the FRP anchorages have a significant effect on the shear strength of beams. The analysis results show that the three models are able to provide an accurate average estimation of shear strength (but with a coefficient of variation up to 0.35) when FRP reinforcement orthogonal to the beam axis is considered, while a significant underestimation (up to 19%) affected the results for inclined FRP reinforcement. Moreover, all the models underestimated the resistance of beams with a T section.

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Assessment of the existing models to evaluate the shear strength contribution of externally bonded frp shear reinforcements

Cited by 18 publications

References 79 publications

Strengthening Existing Concrete Structures with Fibre Reinforced Polymers (FRP) in the New Version of Eurocode 2

Strengthening Existing Concrete Structures with Fibre Reinforced Polymers (FRP) in the New Version of Eurocode 2

Reliable machine learning for the shear strength of beams strengthened using externally bonded FRP jackets

Influence of Cross-Section Shape and FRP Reinforcement Layout on Shear Capacity of Strengthened RC Beams

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