Bond Behavior of FRP–Concrete in Presence of Intermediate Crack Debonding Failure

Mohammadi, Tayyebeh; Wan, Baolin; Harries, Kent A.; Sweriduk, Michael

doi:10.1061/(asce)cc.1943-5614.0000797

Cited by 37 publications

(11 citation statements)

References 29 publications

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“…As a result, the acceleration factor AF H of mass gain due to water absorption based on the proposed accelerated test method can be calculated with Eqs. (5) and (10) for the Fickian and non-Fickian resins, respectively. It is shown that, for the specimens with different thicknesses, the ratio of required aging times to reach a given mass gain is inversely proportional to the square of their thickness ratio.…”

Section: Acceleration Effect For Long-term Water Absorption Evaluationmentioning

confidence: 99%

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A new thickness-based accelerated aging test methodology for resin materials: Theory and preliminary experimental study

Wang

Zhang

Cai

et al. 2018

Construction and Building Materials

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h i g h l i g h t s Thickness-based accelerated aging test method (ThAM) is firstly proposed for resin materials. Acceleration factors are theoretically deduced for water absorption and tensile behaviours of resin materials. Effects of specimen thickness on water absorption and tensile strength retention of resin materials are studied. The proposed ThAM ensures stable accelerated efficiency without changing the degradation mechanism of resin materials.

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Section: Acceleration Effect For Long-term Water Absorption Evaluationmentioning

confidence: 99%

“…In recent decades the repair and rehabilitation of existing structures have received increasing concerns [1][2][3][4][5][6]. Due to its convenience in construction, epoxy resin is widely used as an adhesive to bond external reinforcements (e.g.…”

Section: Introductionmentioning

confidence: 99%

A new thickness-based accelerated aging test methodology for resin materials: Theory and preliminary experimental study

Wang

Zhang

Cai

et al. 2018

Construction and Building Materials

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“…They modeled the crack propagation in concrete by using the weight function method to analyze interfacial debonding between FRP and concrete. The behavior of FRP-strengthened concrete beams was further investigated by Mohammadi et al [20] via integrating the cohesive crack approach and the damaged concrete technique thru advanced finite element (FE) method. In addition, the intermediate crack (IC) debonding of FPR lamina was researched in specimens through tracking stress propagation at the site of main cracks, by changing the crack location relative to mid-span.…”

Section: Introductionmentioning

confidence: 99%

Experimental verification and simulation of fracture behavior of CFRP reinforced self-consolidating concrete beams with initial notch

et al. 2020

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The current study presents numerical and experimental approaches in the assessment of fracture behavior of self-consolidating concrete beams strengthened with carbon fiber-reinforced polymer (CFRP) lamina. The failure modes, mid-span displacement, and the load-bearing capacity of specimens with initial notches at mid-span are analyzed by varying the notch length and the beam height. Furthermore, the effects of variations in CFRP and concrete mechanical properties, bond strength, and notch location are examined by using the non-linear finite element analysis. Findings reveal that stress concentration in concrete and CFRP, in the vicinity of initial notch, as well as the failure of specimens occur as a result of CFRP debonding and crack extension. Moreover, it is observed that load-mid-span displacement curves are characterized by two peak load points strength. At the first stage, the applied load increases up to one peak value and then at the second stage there is a drop in the load-caring capacity. The applied load is then improved to another peak value due to the relatively high cohesive effect of the CFRP sheet at the third stage. Among different variables, the second peak load shows higher sensitivity to variations of the elastic modulus of CFRP, and bond strength at interface. As the notch approaches the beam support, and hence the relative distance from mid-span changes from 0 to 2/3, the two peak loads are respectively escalated by 116 and 58%, and thus the inclined crack propagates toward mid-span.

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“…They also verified the results using numerical simulations to ensure validity. Mohammadi et al used the numerical analysis of finite element method, combining the cohesive crack method and damaged concrete model, examining the crack growth and separation of FRP in sheet‐strengthened beams. They concluded that inter‐crack debonding starts at diagonal crack tips and near main flexural‐shear cracks where the moment‐shear ratio is high.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on fracture behavior of notched self‐consolidating concrete beam strengthened with off‐axis CFRP sheet

Sangi

Amiri

Abdollahzadeh

et al. 2019

Structural Concrete

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In this study, the effects of fiber orientation within the carbon fiber reinforced (CFRP) sheets, on the fracture mode and crack growth of specimens were investigated by constructing five groups of initially notched self‐consolidating concrete beams, and strengthening them with CFRP sheets in the tensile area. Furthermore, the bearing capacity, strain variation along the sheet, crack mouth opening, and the midspan displacement were recorded by varying the height of the beams and the initial notch lengths. The results indicate that the load‐crack mouth opening curves have two peak load points. First, the applied load increases up to one peak value and then there is a drop in the load‐caring capacity. Afterwards, the applied load is improved to another peak value due to the relatively high cohesive effect of the CFRP sheet. The results show that as the height of the beam section increases, or the initial notch length decreases, the first and the second peak loads increase. By comparing the specimens with different fiber angles in each group, it was observed that the specimen with fiber angle 0° has a higher capacity relative to other angles, yet its failure occurs in a lower displacement. Furthermore, with the help of finite element software and nonlinear static analysis, the behavior of the aforementioned beams including the stress and strain distributions in the CFRP sheet, and the sheet‐to‐concrete bond zone have been examined and compared with the existing experimental results for validation.

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Bond Behavior of FRP–Concrete in Presence of Intermediate Crack Debonding Failure

Cited by 37 publications

References 29 publications

A new thickness-based accelerated aging test methodology for resin materials: Theory and preliminary experimental study

A new thickness-based accelerated aging test methodology for resin materials: Theory and preliminary experimental study

Experimental verification and simulation of fracture behavior of CFRP reinforced self-consolidating concrete beams with initial notch

Experimental study on fracture behavior of notched self‐consolidating concrete beam strengthened with off‐axis CFRP sheet

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