Computer Simulations of End-Tapering Anchorages of EBR FRP-Strengthened Prestressed Concrete Slabs at Service Conditions

Wattanapanich, Chirawat; Imjai, Thanongsak; Garcia, Reyes; Rahim, Nur Liza; Abdullah, Mohd Mustafa Al Bakri; Sandu, Andrei Victor; Vizureanu, Petrică; Matasaru, Petre Daniel; Thomas, Blessen Skariah

doi:10.3390/ma16020851

Cited by 8 publications

(6 citation statements)

References 28 publications

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“…Addition of AF in concrete mixes gradually reduces the workability properties, but addition of PR in optimized AF enhances the slump value of HSC mixes made with optimum dosages of AF (Figure 3). It is concluded that the production of HSC is possible with the addition of AF without compromising the workability properties of concrete, thereby adding the PR [29][30][31][32].…”

Section: Strength Propertiesmentioning

confidence: 99%

“…A tapering technique is proposed, gradually reducing FRP thickness towards the plate end, which reduces bond stress concentrations by up to 15% and prevents debonding. The study improves understanding of FRP-strengthened elements and advances computational tools for structural analysis [30]. Ortiz et al provide an overview of the environmental and mechanical factors affecting the durability and mechanical properties of fiber-reinforced polymer (FRP) composites used in reinforced concrete (RC) structures, highlighting the potential effects of harsh environmental conditions and mechanical phenomena on FRP composites.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Behavior of High-Strength Concrete Reinforced with Aramid Fiber and Polyurethane Resin

Amalraj,

Ilangovan

2023

Buildings

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Over the past few decades, research has been conducted to develop high-strength concrete (HSC) for high-rise structures and bridge decks. The research discussed in the study focuses on using polyurethane resin (PR) and aramid fibers (AF) to develop HSC, which enhances its strength, durability, and structural properties without increasing the cementitious content. This approach can lead to more sustainable and cost-effective construction practices by reducing the cementitious materials required. In the present investigation, M50-grade concrete mixes were designed in accordance with the guidelines mentioned in Indian Standard (IS) 10262 along with the addition of supplementary cementitious materials, such as fly ash and silica fume. Initially, varying percentages of AF (0% to 3%) and PR (0% to 6%) were added into the concrete mixes and detailed experimental investigations were completed on workability, strength, durability, and structural properties. It is concluded that the addition of AF and PR shows significant improvements in strength, durability, and structural properties compared to traditional HSC created with zero AF and PR content. As reinforced concrete (RC) elements serve as the final product for human construction projects, it is crucial to ensure that their structural properties are reliable. In order to validate the findings from experimental investigations, numerical simulations were conducted using the ANSYS commercial package software. Specifically, the structural properties of RC beams were analyzed using this software, allowing for further validation and verification of the experimental results. From the detailed investigation, it is concluded that 2.5% addition of AF and 4% addition of PR demonstrates better results and is considered the optimum ingredient dosage, which can be used as a reference for future studies and practical applications. These findings can result in the development of new and improved building materials and techniques that can potentially lead to safer, more durable, and sustainable structures.

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Section: Strength Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Behavior of High-Strength Concrete Reinforced with Aramid Fiber and Polyurethane Resin

Amalraj,

Ilangovan

2023

Buildings

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“…The latter, frequently considered the most important [14], can be classified [15] as intermediate shear-or flexural-induced debonding (related to the onset of intermediate cracks in high-tension regions, which propagate towards the strengthening end), plate end interfacial debonding [16,17] (related to the low adhesive bond strength of the adhesive layer at the concrete-FRP interface), and concrete cover separation [18] (related to adhesive interface layer bond strength significantly higher than concrete tensile strength). Moreover, in the literature, experimental and numerical works investigate the effects of the thickness or the elastic modulus of the FRP plate on the efficiency of the FRP plate bonding [19] and propose an analytical approach to determine the excessive deformation induced by the shear crack propagation [20], also providing retrofitting techniques based on the near-surface-mounted (NSM) carbon fiber-reinforced rod method, as reported in [21].…”

Section: Introductionmentioning

confidence: 99%

The Reinforcing Effect of Nano-Modified Epoxy Resin on the Failure Behavior of FRP-Plated RC Structures

et al. 2023

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The ability to manipulate concrete-based and composite materials at the nanoscale represents an innovative approach to improving their mechanical properties and designing high-performance building structures. In this context, a numerical investigation of the reinforcing effect of nano-modified epoxy resin on the structural response of fiber-reinforced polymer (FRP)-plated reinforced concrete (RC) components has been proposed. In detail, an integrated model, based on a cohesive crack approach, is employed in combination with a bond–slip model to perform a failure analysis of strengthened structures. In particular, the proposed model consists of cohesive elements located on the physical interface between concrete and FRP systems equipped with an appropriate bond–slip law able to describe the reinforcing effect induced by the incorporation of nanomaterials in the bonding epoxy resin. Preliminary analyses, performed on reinforced concrete prisms, highlight an increment of 28% in the bond strength between concrete and the FRP system, offered by the nanomaterials embedded in the adhesive layer with respect to the standard one. Moreover, the numerically predicted structural response of a nano-modified FRP-plated beam shows an increment of around 5.5% in the failure load and a reduction in the slip between concrete and the FRP plate of around 76%, with respect to the reinforced beam without nanomaterial incorporation. Finally, the good agreement with experimental results, taken from the literature, highlights the excellent capability of the proposed model to simulate the mechanical behavior of such types of reinforced structures, emphasizing the beneficial effects of the nano-enhanced epoxy resin on the bond strength between concrete and FRP systems.

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“…Compared to the longer standing method of externally bonded laminates (EB-FRP) [9,10], this technique has some significant advantages, especially regarding better adhesiveness, which directly improves the mechanical characteristics of the strengthened beams [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of an Innovative Double Strap Joint Splicing of GFRP Bars by NSM Methods for Strengthening RC Beams

Ranković,

Folić,

Zorić

et al. 2023

Period. Polytech. Civil Eng.

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The double strap joint splicing of glass fiber reinforced polymer (GFRP) bars for reinforced concrete (RC) beams strengthening, applying the near surface mounting (NSM) method, has been proposed in the paper. The proposed method consists of application of the supplementary GFRP bars symmetrically positioned in the cut-off zone of the main GFRP reinforcement. The performances of this splicing method have been experimentally tested for the most unfavorable case of the GFRP reinforcement cut-off in the maximal bending moment zones. During the experiment, the varied parameter has been overlapping length of the bars, taking values of 20∅ and 40∅. Evaluation of the splicing technique is done comparing the experimental results with the results of the behavior of beams strengthened by GFRP bars without cut-off and with cut-off, but without splicing. Experimental research encompassed analysis of strength, stiffness, ductility, crack pattern, strains in the steel, GFRP reinforcement and concrete, and the failure modes of the beams. It has been shown that in case of the cut-off of the GFRP bar, strengthening effectivity decreases for 39%, and that in the case of bypassing the cut-off using double strap 20∅ and 40∅ long, strengthening effectivity decreased 23%, and 14% respectively, compared to the beam without GFRP bar cut-off. Using extrapolation, it has been shown that double strap with length of 60∅ provided strength equivalent to the case without cut-off. The result of application of this splicing method of the additional GFRP bars is significant increase of strength and serviceability of the strengthened RC beams.

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Computer Simulations of End-Tapering Anchorages of EBR FRP-Strengthened Prestressed Concrete Slabs at Service Conditions

Cited by 8 publications

References 28 publications

Experimental Behavior of High-Strength Concrete Reinforced with Aramid Fiber and Polyurethane Resin

Experimental Behavior of High-Strength Concrete Reinforced with Aramid Fiber and Polyurethane Resin

The Reinforcing Effect of Nano-Modified Epoxy Resin on the Failure Behavior of FRP-Plated RC Structures

Experimental Analysis of an Innovative Double Strap Joint Splicing of GFRP Bars by NSM Methods for Strengthening RC Beams

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