Steel-Reinforced Grout (SRG) strengthening of shear-critical RC beams

Thermou, Georgia E.; Papanikolaou, Vassilis K.; Lioupis, C.; Hajirasouliha, Iman

doi:10.1016/j.conbuildmat.2019.04.259

Cited by 31 publications

(21 citation statements)

References 35 publications

(54 reference statements)

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“…Therefore, U-wraps associated with mechanical anchorage are usually used. The effectiveness of mechanical anchoring has been confirmed by the studies of Mitoldis [59], Papakonstantinou [60], Vakjira [61], and Thermou [62]. Only Gonzales [63] did not report a significant increase in shear strength.…”

Section: Shear Strengthening Of Beamsmentioning

confidence: 83%

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Steel-Reinforced Polymers and Steel-Reinforced Composite Mortars for Structural Applications—An Overview

Krzywoń

2020

J. Compos. Sci.

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Bonding of external reinforcement is currently the simplest, fastest, and most popular method of strengthening concrete and masonry structures. Glass and carbon organic fibers are the dominant materials used, but alternatives also include high-strength steel wires. The mechanical properties of such steel are comparable to those of carbon fiber. Due to their good compatibility with mortars, steel wires are particularly well suited to the revitalization of historic buildings. The manuscript provides an overview of research and experience in the use of steel-reinforced polymers (SRPs) and steel-reinforced composite mortars (SRCMs, also called steel-reinforced grout (SRG)) for structural strengthening. The examples described are for concrete beams, slabs and columns, walls, and masonry arches. The results of laboratory tests are discussed. The summary presents the advantages and disadvantages of composites based on ultra-high-strength steels compared with more popular carbon fiber composites.

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Section: Shear Strengthening Of Beamsmentioning

confidence: 83%

“…The failure mode depends on the intensity of strengthening. A fully wrapped strong reinforcement moves the failure into the flexure zone [62]. A single-layered and fully wrapped beam fails due to the presence of a shear-flexure crack.…”

Section: Shear Strengthening Of Beamsmentioning

confidence: 99%

Steel-Reinforced Polymers and Steel-Reinforced Composite Mortars for Structural Applications—An Overview

Krzywoń

2020

J. Compos. Sci.

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“…In all these studies, a considerable improvement in terms of load-bearing capacity was observed. Thermou et al [16] performed shear tests on SRG reinforced concrete beams; from the results obtained, they assessed that SRGs effectively improve the shear capacity and the ductility of RC beams. For the beams strengthened with SRG U-wraps, a drastic improvement was observed; the ultimate load was 104% higher than that observed on the un-strengthened beam.…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of the DIC as a Measurement System in SRG Shear Strengthened Reinforced Concrete Beams

Funari

Verre

2021

Crystals

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Steel Reinforced Grout (SRG) materials are generating considerable interest as strengthening system of reinforced concrete (RC) structures. They are finding increasing use in several civil engineering applications mainly due to the advantages they offer over traditional material such as high strength to weight ratio, ease of application, durability and low price. This paper describes the results of an experimental investigation carried out on SRG shear strengthened RC beams and gives evidence of the Digital Image Correlation (DIC) effectiveness as a measurement system. The tests performed had two main objectives: (i) assess the effectiveness of continuous and discontinuous U-wrapped jackets comprising a different number of layers and strips; (ii) assess the shear crack distribution during the tests by means of the DIC measurements. The results confirmed that reinforcing RC beams with SRG jackets can increase the load-bearing capacity; when the beam was reinforced with a continuous two-layered SRG strip, an increase of 84% was observed (compared to the unreinforced beam). The Linear Variable Differential Transformers (LVDT) measurements validated the results obtained by means of the DIC.

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“…Nonetheless, research on the application of this technique for strengthening shear deficient beams is scarce. [41][42][43] In addition, previous studies focused on the use of an SRG system for EB strengthening. The failure of EB-SRG strengthened beams, similar to that of EB-FRCM, is mostly attributed to SRG debonding.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of reinforced concrete beams in shear using different steel reinforced grout techniques

Wakjira

Ebead

2020

Structural Concrete

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In this study, steel reinforced grout (SRG) is proposed for shear strengthening of reinforced concrete (RC) beams using the near-surface embedded (NSE) technique. It is believed based on several research contributions in the literature that the NSE technique precludes or delays the onset of premature debonding and achieves higher strength increase in strengthened beams compared to the externally bonded (EB) counterpart. The tests conducted in this study used 13 RC beams to determine the shear behavior of RC beams strengthened in shear using SRG. The effect of the strengthening technique (NSE versus EB), SRG fabric density, strengthening scheme (side-bonded vs. U-wrapped), and the strengthening configuration (continuous vs. discontinuous) on RC shear enhancement was studied. The strengthening effectiveness of the SRG system was assessed in terms of the shear capacity, failure mechanism, load-deflection response, and strain results.The NSE-SRG increased the beam shear strength by an average of 100%, alleviated SRG debonding, and enhanced the deformation characteristics. The average increase in the shear strength of the EB-SRG strengthened beam was 54% and 105% for the continuous and discontinuous SRG strips, respectively. An analytical model is proposed to predict the shear capacity of both the NSE-SRG and EB-SRG strengthened beams and give accurate and safe predictions.

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Steel-Reinforced Grout (SRG) strengthening of shear-critical RC beams

Cited by 31 publications

References 35 publications

Steel-Reinforced Polymers and Steel-Reinforced Composite Mortars for Structural Applications—An Overview

Steel-Reinforced Polymers and Steel-Reinforced Composite Mortars for Structural Applications—An Overview

The Effectiveness of the DIC as a Measurement System in SRG Shear Strengthened Reinforced Concrete Beams

Strengthening of reinforced concrete beams in shear using different steel reinforced grout techniques

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