Experimental and analytical investigation for enhancement of flexural beams using multilayer wraps

Khalifa, E.; Al-Tersawy, Sherif H.

doi:10.1016/j.compositesb.2012.08.021

Cited by 9 publications

(3 citation statements)

References 12 publications

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“…The rise of FRP composites in strengthening applications of RC structures can be attributed to their high strength, resistance to corrosion, light weight and ease of application (American Concrete Institute Committee 440 [1]). It is well proven that FRP-strengthening can improve both flexural and shear resistances of RC structures [2][3][4][5][6][7]. In addition, concrete columns gains more strength when confined with FRP composites [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of reinforced concrete frame structures strengthened with FRP laminates using a reliability-based advanced approach

Ali

Bigaud

Riahi

2018

Composites Part B: Engineering

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Section: Introductionmentioning

confidence: 99%

Seismic performance of reinforced concrete frame structures strengthened with FRP laminates using a reliability-based advanced approach

Ali

Bigaud

Riahi

2018

Composites Part B: Engineering

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“…Different anchorage systems for EB FRP have been developed and reported in the literature [8,10,11]. Unlike other anchorage methods, anchorage by means of FRP U-wraps does not require predrilling and do not suffer from corrosion.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of Concrete Cover Separation in Concrete Beams Strengthened with Fiber-reinforced Polymer Composites

Al-Saawani

El-Sayed

Al‐Negheimish

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Strengthening of reinforced concrete (RC) beams using fiber reinforced polymers (FRP) is an effective method that is gaining more acceptance worldwide. However, failure of the strengthened beams at the plate-end region by concrete cover separation (CCS) compromises the effectiveness of such a strengthening system. Among available anchorage systems to remedy such problem, the use of FRP U-wraps at the end region of the externally bonded FRP has the potential to prevent CCS failure. Most studies in the literature suffer from poor design of test specimens and the use of random amounts of FRP anchorage. This resulted in nonconclusive findings and contradicting results on the real effectiveness of FRP U-wraps as an anchorage to prevent plate-end debonding failure. That in turn has been reflected in the lack of reliable design methods for the design of FRP U-wrap anchorage. In this paper, the effect of FRP U-wraps on the mitigation of CCS failure in FRP-strengthened RC beams was experimentally examined and quantified. The study included full-scale RC beams strengthened in flexure using carbon FRP (CFRP) sheets and anchored at the plate-end region using vertical CFRP U-wraps. The test variable was the amount of CFRP U-wrap that is required to achieve complete mitigation of CCS. The test results indicated the effectiveness of FRP U-wraps on mitigating CCS failure once the required area of CFRP U-wrap was placed. Relevant design models were presented and assessed against the experimental results of the current study. The comparisons indicated inaccurate predictions for the area of FRP U-wrap that is required to prevent CCS. This sheds the light on the need for developing a more reliable and accurate method for the design of an end anchorage to prevent CCS failure.

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“…It is a convenient and effective anchoring method used to delay and inhibit the premature debonding failure of FRP sheets and to improve the capacity and ductility of the components. It mainly includes the CFRP U-shaped laminate anchor system for flexural reinforcement [17][18][19][20][21][22][23] and the FRP U-jacking system for shear reinforcement [24][25][26]. Fu et al [27] showed that both the load-carrying capacity and the ductility of an FRP-plated RC beam can be significantly enhanced by FRP U-wraps at the critical plate end.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on FRP‐to‐Concrete Bonded Joints with FRP Sheet Anchor System

Liu

et al. 2020

Advances in Materials Science and Engineering

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Fiber-reinforced polymer (FRP) has been widely used for retrofitting and strengthening concrete structures over the past two decades. Because concrete members retrofitted by externally bonded FRP sheets can fail prematurely in debonding because of the fracture between FRP and concrete, FRP tensile strength cannot be fully utilized in engineering practices. Numerous useful investigations have been conducted to develop effective anchor systems to restrict FRP debonding. us, an FRP sheet-anchor system was developed and observed to be one of the most effective and convenient anchor systems. e FRP sheet-anchor system is applied to reinforced concrete beams strengthened with U-wrapping and side-bonded FRP configurations in few design guidelines. However, only a few investigations have focused on the failure mechanism of the FRP sheet-anchor system in the existing literature. erefore, the main objective of this study is analyzing the effect of the carbon FRP (CFRP) sheet-anchor system on the bonding behavior of the CFRP-concrete interface, particularly the effect of the width and stiffness of the CFRP sheet-anchor system. In addition, the anchor-strengthened stage is defined by the load-slip response, which is different from that of specimens without the CFRP sheet-anchor system. Based on the experimental results, three linear stage models of the bond-slip constitutive relationship are proposed in this study.

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Experimental and analytical investigation for enhancement of flexural beams using multilayer wraps

Cited by 9 publications

References 12 publications

Seismic performance of reinforced concrete frame structures strengthened with FRP laminates using a reliability-based advanced approach

Seismic performance of reinforced concrete frame structures strengthened with FRP laminates using a reliability-based advanced approach

Mitigation of Concrete Cover Separation in Concrete Beams Strengthened with Fiber-reinforced Polymer Composites

Experimental Study on FRP‐to‐Concrete Bonded Joints with FRP Sheet Anchor System

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