Effect of different parameters on the performance of FRP anchors in combination with EBR-FRP strengthening systems: A review

Muciaccia, Giovanni; Khorasani, Mehdi; Mostofinejad, Davood

doi:10.1016/j.conbuildmat.2022.129181

Cited by 20 publications

(11 citation statements)

References 127 publications

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“…Also, it has been known that utilizing FRP anchorage techniques can delay or control the deboning and enhance the flexural strength. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] Different methods have been used to anchor the FRP sheets that are attached to the tension side of beams.…”

Section: Introductionmentioning

confidence: 99%

Improvements in lightweight concrete T beams CFRP strengthened and anchored with U‐wraps

Zaki,

Rasheed,

Mitsios

2024

Structural Concrete

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This research provides a study for an experimental program using sand‐perlite‐lightweight reinforced concrete (RC) beams strengthened and anchored with carbon fiber reinforced polymer (CFRP) materials. The main objective of this work is to showcase the efficiency of using U‐wrap anchors to secure the externally applied CFRP sheets on lightweight RC beams. A series of six full‐scale T‐beams with an increasing number of CFRP U‐wraps per shear span was prepared and tested. The use of U‐wrap anchorage enhanced the flexural performance of the sand‐lightweight concrete beams by progressively delaying the premature debonding of CFRP sheets as a direct function of the number of U‐wraps used per shear span. The beam flexural capacity gradually improved from 116 kN without the use of U‐wrap anchors to 182 kN when using six U‐wraps per shear span, which reflects a significant enhancement. Similarly, the ultimate deflection gradually improved from 56 mm for the beam without U‐wrap anchors to 94 mm when applying six U‐wraps per shear span. A design model established earlier, for normal weight concrete, has been successfully qualified to yield accurate findings against the experimental results. Also, the outcome of this study interestingly showed that the ultimate strength results of the anchored beams were close to their counterparts of normal weight concrete conducted on identical beams. This finding shows that U‐wrap anchors performed efficiently despite the lack of coarse aggregate interlock in the concrete mix.

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Section: Introductionmentioning

confidence: 99%

Improvements in lightweight concrete T beams CFRP strengthened and anchored with U‐wraps

Zaki,

Rasheed,

Mitsios

2024

Structural Concrete

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“…Fiber-reinforced polymers (FRPs) are a promising steel alternative because they are high-strength, lightweight, immune to corrosion, and electromagnetically transparent [ 3 , 4 , 5 , 6 ]. Still, the relatively low resistance to ultraviolet radiation, elevated temperatures, and humidity reduce the mechanical performance of FRP materials with time [ 7 , 8 , 9 ]; the cycling loads complicate the issue, reducing the mechanical resistance of the reinforcement systems even more [ 10 , 11 ]. Regarding FRP bars, most experimental works consider the pull-out behavior under cyclic loads, e.g., Mohamed et al [ 12 ], Kim and Lee [ 13 ], Liu X. et al [ 14 ], Shen et al [ 15 ], Xiao et al [ 16 ], Shi et al [ 17 ], and Pan et al [ 18 ], which could transform into the structural analysis.…”

Section: Introductionmentioning

confidence: 99%

“…As described in the previous section, recent achievements in engineering, developing advanced fibers and reinforcement materials (steel and non-metallic), and other reinforcement solutions caused problems in setting an efficient solution for a particular situation. Furthermore, the combination of fibers and continuous reinforcement (either embedded bars, near-surface-mounted strips, or externally bonded laminates) in hybrid systems (e.g., [ 10 , 11 ]) complicates the reinforcement efficiency analysis.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Residual Stiffness of Concrete Beams with Polymeric Reinforcement under Repeated Loads

et al. 2023

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Current technology development ensures a variety of advanced materials and options for reinforcing concrete structures. However, the absence of a uniform testing methodology complicates the quantification and comparative analysis of the mechanical performance of the composite systems. The repeated mechanical loads further complicate the issue. This research extends the recently developed residual stiffness assessment concept to the repeated loading case. It provides an engineer with a simplified testing layout and analytical model to quantify the residual flexural stiffness of standardized laboratory specimens subjected to repeated cycling loads. This model explicitly relates the particular moment and curvature values, requiring neither iterative calculations nor the load history. Thus, this feature allows residual stiffness quantification under repeated loading conditions, including complete reloading of the beam samples imitating the structural strengthening procedure; the proposed technique is equally efficient in quantifying the residual stiffness of the beam samples with any combinations of fiber-reinforced polymer (FRP) reinforcements, i.e., embedded bars, near-surface-mounted strips, and externally bonded sheets. This study employs 12 flexural elements with various reinforcement and loading layouts to illustrate the proposed methodology’s efficiency in quantifying the residual strength of the tension concrete, which estimates the efficiency of the reinforcement system. The explicit quantifying of the residual resistance of the FRP reinforcement systems under repeated load cycles describes the essential novelty of this work.

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“…In recent years, polymer composite materials have been widely used as external reinforcement [ 19 , 20 , 21 , 22 , 23 , 24 ]. This technology for strengthening and repairing existing structural elements has shown effectiveness in various elements, including beams [ 25 , 26 ], columns [ 27 , 28 , 29 ], slabs [ 30 , 31 ], and others.…”

Section: Introductionmentioning

confidence: 99%

Strength of Compressed Reinforced Concrete Elements Reinforced with CFRP at Different Load Application Eccentricity

et al. 2022

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Currently, many studies are devoted to the use of polymer composite materials to increase the strength and stability of concrete elements. In compressed reinforced concrete elements, the bearing capacity depends on the eccentricity of the external application of the external force and the corresponding stress-strain state, as well as the location and number of composite materials glued to the surface of the structure. The choice of a scheme for placing composite materials depending on the stress state of the structure is an urgent scientific problem. At the same time, the issue of central compression and the compression of columns with large eccentricities has been well studied. However, studies conducted in the range of average eccentricities often have conflicting results, which is the problem area of this study. The primary aim of this study was to increase the strength and stiffness of compressed reinforced concrete elements reinforced with composite materials, as well as a comparative analysis of the bearing capacity of ten different combinations of external longitudinal, transverse, and combined reinforcement. The results of testing 16 compressed columns under the action of various eccentricities of external load application (e0/h = 0; 0.16; 0.32) are presented. It is shown that the use of composite materials in strengthening structures increases the bearing capacity up to 41%, and the stiffness of the sections increases up to 30%. Based on the results of the study, recommendations are proposed for improving the calculation method for inflexible columns reinforced in the transverse direction, which take the work of concrete under the conditions of a three-dimensional stress state into consideration.

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Effect of different parameters on the performance of FRP anchors in combination with EBR-FRP strengthening systems: A review

Cited by 20 publications

References 127 publications

Improvements in lightweight concrete T beams CFRP strengthened and anchored with U‐wraps

Improvements in lightweight concrete T beams CFRP strengthened and anchored with U‐wraps

Quantifying the Residual Stiffness of Concrete Beams with Polymeric Reinforcement under Repeated Loads

Strength of Compressed Reinforced Concrete Elements Reinforced with CFRP at Different Load Application Eccentricity

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