The combined effects of wet–dry cycles and sustained load on the bond behavior of FRP–concrete interface

Liang, Hongjun; Li, Shan; Lu, Yiyan; Yang, Ting

doi:10.1002/pc.24785

Cited by 37 publications

(13 citation statements)

References 32 publications

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“…The details of the experimental programme can be found in our previously published article [ 3 ]. Here, only a brief description is provided to ensure the completeness of the paper.…”

Section: Experimental Programmementioning

confidence: 99%

“…Externally bonded fibre-reinforced polymer (FRP) composites have been shown to be an effective strengthening method for existing engineering structures due to its excellent tensile strength, light weight, corrosion resistance, and easy tailoring [ 1 , 2 ]. The performance of this method depends on adequate bond strength between the FRP and the concrete, which ensures the stress transmission between and coordination of FRP and concrete [ 3 ]. Therefore, numerous studies have been conducted on the bond mechanism of the FRP-to-concrete interface, including experimental studies [ 4 , 5 , 6 , 7 ], theoretical analysis [ 8 , 9 , 10 , 11 ], and finite-element simulations [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Reliability Analysis of Bond Behaviour of CFRP–Concrete Interface under Wet–Dry Cycles

Liang

et al. 2018

Materials

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Effective bonding between adherents plays a key role in retrofitting concrete structures in civil engineering using fibre-reinforced polymers (FRPs). To ensure structural safety, it is critical to develop design codes, which account for uncertainties of materials, the environment, and load, to estimate bond behaviour under long-term exposure to harsh environments. Therefore, a reliability analysis was performed to study the bond behaviour of FRP–concrete interface under wet–dry cycles and sustained loading. Thirty double-lap, shear-bonded carbon FRP (CFRP)–concrete composite specimens were tested after wet–dry cycles and sustained loading exposure. The fracture energy Gf of the bond behavior between CFRP and concrete was directly obtained from the measured local bond-slip curves. Five widely used test methods were adopted to verify the possible distribution types of Gf. Based on the best fit distribution of Gf, a reliability index β was then calculated for the specimens. The effects of wet–dry exposure and sustained loading on β were analysed separately. The effects of the mean and standard deviation of the load on β were compared. It was found that the mean had a greater impact on reliability than the standard deviation, but neither changed the regulation of the exponential reduction of β with increasing wet–dry cycle time. Their impact was significant for a small number of wet–dry cycles but insignificant for more than 4000 wet–dry cycles.

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“…The details of the experimental programme can be found in our previously published article [ 3 ]. Here, only a brief description is provided to ensure the completeness of the paper.…”

Section: Experimental Programmementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Bond Behaviour of CFRP–Concrete Interface under Wet–Dry Cycles

Liang

et al. 2018

Materials

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“…In recent years, many scholars have carried out experimental studies on the durability of FRP (He et al, 2020; Al-Safy et al, 2014; Dong et al, 2018). The relationships between the ultimate strength, elastic modulus, elongation, and degradation time of FRPs under different environmental conditions have been studied (Liang et al, 2019; Yang et al, 2018; Yu, 2018). The durability of FRP has been measured by applying the reduction of ultimate strength, and the degradation model and degradation law of FRP sheets in different environments have been established (Hedayat and Baniasadizade, 2015; Xu, 2013).…”

Section: Introductionmentioning

confidence: 99%

Method to test the durability of fiber-reinforced polymers based on elastic modulus

Yang

2020

Advances in Structural Engineering

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The performance degradation of fiber-reinforced polymer is often assessed based on the ultimate strength obtained during a destructive test. This method has the advantages of simple operation, clear internal mechanism, and noticeable data variation. However, because fiber-reinforced polymers are composed of high molecular compounds, their properties are influenced by several factors, such as the manufacturing process and composition ratio. Without a unified benchmark, it is difficult to unify destructive test data obtained by different researchers and organizations. In this study, a new test method named SNFT (Same Non-failure FRP Test) is proposed for assessing the durability of fiber-reinforced polymers. SNFT is a testing method in which the same specimen can be repeatedly tested at different aging periods. The rationality of the SNFT method is analyzed using the displacement compatibility between the degraded zone and the undegraded zone. The conversion principle based on the degraded degree between the destructive test and the SNFT method is deduced by calculation. An experimental test was designed to investigate the test conditions and control parameters of the SNFT method. SNFT and synchronous destructive tests on glass fiber–reinforced plastic were carried out under the conditions of wet heat and alkali solution, and the theoretical results were compared and verified with data in the literature. The results show that compared with the traditional durability destructive test method, the SNFT method shows more consistent data and less data fluctuation and incurs a lower test cost. The elastic modulus, adopted as the durability benchmark, can be similar to the test results of traditional destructive test methods and could be transformed based on the transformation relationship proposed in this article. The degradation of fiber-reinforced polymer in different environments is characterized by the variation in elastic modulus measured using the SNFT method. This study provides a theoretical basis for establishing a unified benchmark of durability tests and data and supports the quantitative design of durability.

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“…A model for calculating the degradation of CFRPconcrete bond interface was proposed, and an environmental coefficient was introduced to predict the service life of CFRP-concrete structures. Liang et al (2019) investigated the bond behavior of CFRP-concrete specimens under wetdry environment (5% NaCl water for 0 to 360 days). It was found that the failure mode turns to the interface failure of adhesive and concrete as the wet-dry cycle increases.…”

Section: Introductionmentioning

confidence: 99%

Interfacial bond-slip relationship between Carbon Fiber Reinforced Polymer Plate and Concrete after High Temperature of Asphalt Paving Construction

Yuan

Zhang

Zhu

et al. 2019

Lat. Am. j. solids struct.

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The bond-slip relationship of Carbon Fiber Reinforced Polymer (CFRP) plate-concrete after the influence of high temperature action of Stone Mastic Asphalt (SMA) paving was investigated in this article. Two groups of double shear specimens with different bonding length were designed and tested. Based on the test results, the failure modes of specimens, the strain distribution and the shear stress of CFRP-concrete interface were analyzed. Considering the influence of high temperature, the interfacial bond-slip constitutive model of CFRP plate and concrete after high temperature action of SMA paving construction was proposed. The proposed model can reflect the nonlinearity and interface softening behaviour of the CFRP plate-concrete interface constitutive relationship under special environment. Through the comparative study of exixting constitutive models, the interface bond-slip constitutive model proposed in this paper considers the effect of high temperature and has good agreement with the test results. KeywordsBond-slip constitutive model, Carbon Fiber Reinforced Polymer (CFRP)-concrete interface, double shear test, high temperature, aspahlat paving, debonding failure Interfacial bond-slip relationship between carbon fiber reinforced polymer plate and concrete after high temperature of asphalt paving construction Xin Yuan et al.

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The combined effects of wet–dry cycles and sustained load on the bond behavior of FRP–concrete interface

Cited by 37 publications

References 32 publications

Reliability Analysis of Bond Behaviour of CFRP–Concrete Interface under Wet–Dry Cycles

Reliability Analysis of Bond Behaviour of CFRP–Concrete Interface under Wet–Dry Cycles

Method to test the durability of fiber-reinforced polymers based on elastic modulus

Interfacial bond-slip relationship between Carbon Fiber Reinforced Polymer Plate and Concrete after High Temperature of Asphalt Paving Construction

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