Short and long-term bond performance of prestressed FRP sheet anchorages

Diab, Hesham; Wu, Zhishen; Iwashita, Kentaro

doi:10.1016/j.engstruct.2009.01.021

Cited by 50 publications

(20 citation statements)

References 11 publications

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“…In general, the applications where accessibility conditions allow wrapping a member with FRP composites, such as FRP wrapping of RC columns, has no problem regarding a debonding issue (Buyukozturk et al 2004). Considering the use of FRPs for external strengthening of the external reinforcement of other types of concrete elements, Xiong et al (2007), Kim et al (2008a, b), Skuturna et al (2008), Diab et al (2009), and Daugevičius et al (2012) found that additional anchoring was essential in order to assure FRP-to-concrete bond strength.…”

Section: Frp Materials Properties and Types Of Manufacturingmentioning

confidence: 99%

FRP Reinforcement for Concrete Structures: State-of-the-Art Review of Application and Design

Gudonis

Timinskas

Gribniak

et al. 2014

Engineering Structures and Technologies

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Fiber reinforced polymers (FRPs) are considered to be a promising alternative to steel reinforcement, especially in concrete structures subjected to an aggressive environment or to the effects of electromagnetic fields. Although attempts to develop effective reinforcement have been followed, the application of FRPs remains limited by the solution to simple structural problems that mainly appear due to the absence of design codes, significant variation in the material properties of FRP composites and limited knowledge gained by engineers as regards the application aspects of FRP composites and structural mechanics of concrete elements reinforced with FRPs. To fill the latter gap, the current state-of-the-art report is dedicated to present recent achievements in FRPs applying practice to a broad engineers’ community. The report also revises the manufacturing process, material properties, the application area and design peculiarities of concrete elements reinforced with FRP composites. Along the focus on internal reinforcement, the paper overviews recent practices of applying FRP reinforced concrete (RC) elements in structural engineering. The review highlights the main problems restricting the application of FRPs in building industry and reveals the problematic issues (related to the material properties of the FRP) important for designing RC following the formulation of targets for further research.

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Section: Frp Materials Properties and Types Of Manufacturingmentioning

confidence: 99%

FRP Reinforcement for Concrete Structures: State-of-the-Art Review of Application and Design

Gudonis

Timinskas

Gribniak

et al. 2014

Engineering Structures and Technologies

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“…The long term behaviour of FRP bonded onto substrates is still not fully understood because of its relatively recent introduction into the construction industry [ 22 ]. However, much of the work that has been carried out has shown that the problematic effects are generally issues to do with the adhesive layer [ 23 ]. What has not yet been satisfactorily looked into is the long term behaviour of FRP associated with using mechanical connectors.…”

Section: Cfrp Strengthening and Stiffening Of Timber Flooringmentioning

confidence: 99%

Innovative Use and Characterization of Polymers for Timber-Related Construction

2010

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Timber gridshells have become a very popular, efficient, sustainable and beautiful structural application of timber. However, given the slender laths involved in this form of construction, there is concern over the durability of timber for this purpose, and Glass FRP (GFRP) laths have been proposed as a possible substitution. This paper considers this possibility. It goes on to look at the possible use of Basalt FRP (BFRP) for the same purpose, from the perspective of its creep characteristics. It is shown that the use of GFRP gridshells is a viable form of construction, and that enhanced durability characteristics of BFRP could lead to their adoption for gridshells, given that the creep characteristics of basalt fibres presented here are comparable to those of glass fibres. An altogether different form of timber construction is that of joist-and-floorboard. In the UK, there are thousands of historic buildings which use this floor construction, and a sizeable proportion of this building stock now requires upgrade, strengthening and/or stiffening to allow these buildings to be fit for purpose into the future. This paper goes on to consider the possible use of Carbon FRP (CFRP) to strengthen and stiffen such timber floors. It is shown that such strengthening and stiffening is entirely feasible, offering the potential for greatly enhanced stiffness, in particular. Further, it is shown that mechanical shear connection between CFRP and timber is best conducted using perpendicular-positioned screws, rather than raked screws.

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“…The percentages of prestress loss were recorded as ranging from 13.4% to 46.64%. Diab et al [9] utilized the second prestressing system to investigate rectangular beams bonded to prestressed FRP sheets, including anchored or unanchored FRP sheet ends. Using different layers of FRP sheet, the prestress levels of the FRP sheets varied from 21% to 40% of the tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Prestress Loss of CFL in a Prestressing Process for Strengthening RC Beams

Guo

Huang

et al. 2017

International Journal of Polymer Science

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A prestressing system was designed to strengthen reinforced concrete (RC) beams with prestressed carbon fiber laminate (CFL). During different prestressing processes, prestress loss was measured using strain gauges attached on the surface of CFL along the length direction. The prestress loss was 50–68% of the whole prestress loss, which is typically associated with CFL slipping between the grip anchors. Approximately 20–27% of the prestress loss was caused by the elastic shortening of the RC beam. An analytical model using linear-elastic theory was constructed to calculate the prestress loss caused by CFL slipping between the anchors and the elastic shortening of the strengthened beams. The compared results showed that the analytical model of prestress loss can describe the experimental data well. Methods of reducing the prestress loss were also suggested. Compared to other experiments, the prestressing system proposed by this research group was effective because the maximum percentage of prestress loss was 14.9% and the average prestress loss was 12.5%.

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Short and long-term bond performance of prestressed FRP sheet anchorages

Cited by 50 publications

References 11 publications

FRP Reinforcement for Concrete Structures: State-of-the-Art Review of Application and Design

FRP Reinforcement for Concrete Structures: State-of-the-Art Review of Application and Design

Innovative Use and Characterization of Polymers for Timber-Related Construction

Prestress Loss of CFL in a Prestressing Process for Strengthening RC Beams

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