Prestressed fibre‐reinforced polymer laminates for strengthening structures

El‐Hacha, Raafat; Wight, R. Gordon; Green, MF

doi:10.1002/pse.76

Cited by 106 publications

(35 citation statements)

References 31 publications

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“…This technique presents several positive aspects since it combines the benefits of passive EBR FRP systems with the advantages associated with external prestressing, mainly [8]: (i) use of non-corrosive materials; (ii) deflection reduction; (iii) crack widths reduction and the onset of cracking is delayed; (iv) internal steel reinforcement strains are relieved; (v) higher fatigue failure resistance; (vi) more efficient use of the concrete and FRP; (vii) opposes stresses due to both dead and live loads; (viii) reduction risk of premature debonding failure between the FRP and concrete; (x) ultimate capacity can be further increased; (xi) it can be worked as a substitute of internal prestress that has been lost; (xii) shear capacity is increased by the longitudinal stresses induced by prestressed FRP laminates.…”

Section: Introductionmentioning

confidence: 99%

Flexural behaviour of RC slabs strengthened with prestressed CFRP strips using different anchorage systems

Correia

Teixeira

Michels

et al. 2015

Composites Part B: Engineering

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a b s t r a c tThe Externally Bonded Reinforcement (EBR) technique using Carbon Fiber-Reinforced Polymers (CFRP) has been commonly used to strengthen concrete structures in flexure. The use of prestressed CFRP material offers several advantages well-reported in the literature. Regardless of such as benefits, several studies on different topics are missing. The present work intends to contribute to the knowledge of two commercially available systems that differ on the type of anchorage: (i) the Mechanical Anchorage (MA), and (ii) the Gradient Anchorage (GA). For that purpose, an experimental program was carried out with twelve slabs monotonically tested under displacement control up to failure by using a four-point bending test configuration. The effect of type of anchorage system (MA and GA), prestrain level (0 and 0.4%), width (50 mm and 80 mm) and thickness (1.2 mm and 1.4 mm) of the CFRP laminate, and the surface preparation (grinded and sandblasted) on the flexural response were the main studied parameters. Better performance was observed for the slabs: (i) with prestressed laminates, (ii) for the MA system, and (iii) with sandblasted surface preparation.

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Section: Introductionmentioning

confidence: 99%

Flexural behaviour of RC slabs strengthened with prestressed CFRP strips using different anchorage systems

Correia

Teixeira

Michels

et al. 2015

Composites Part B: Engineering

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show abstract

“…When applied to concrete structures, prestressing of the laminate will result in high shear stresses at the laminate end which might cause failure of the concrete cover even at very low prestressing levels (around 5% of the tensile strength of the laminate) [5]. In most cases, it has been necessary to anchor the laminate mechanically at its ends to avoid such failure [1].…”

Section: Introductionmentioning

confidence: 99%

Analysis of interfacial shear stresses in beams strengthened with bonded prestressed laminates

Al‐Emrani

Kliger

2006

Composites Part B: Engineering

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“…The increasing knowledge on the use of external reinforcement, taken from several research studies and applications along the years, induces the search for the optimization of the composite properties. As an example, the pre-stressed FRP is a new technique which presents the advantages of better crack control and decreased deformation (El-Hacha et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of concrete beams reinforced with pre-stressed CFRP

Neto

Alfaiate²,

Vinagre

2008

Int J Fract

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In this paper, a numerical simulation is presented on the behaviour of concrete beams, reinforced with pre-stressed CFRP. The numerical results are compared to experimental results. Nonlinear material behaviour is considered, namely: the inelastic compressive concrete behaviour, the elasto-plastic behaviour of steel reinforced bars, the bond-slip relationship between the concrete and the internal steel reinforced bars, the mode-II fracture interface between the concrete and the pre-stressed CFRP and concrete cracking. Cracking in concrete is modelled according to a discrete crack approach: micro-cracking is assumed to localize at fictitious cracks with initial zero width. Two different approximations are adopted: (i) the fictitious cracks are embedded within the finite elements, giving rise to a discrete strong discontinuity formulation and (ii) main cracks, similar to the experimentally observed, are introduced, using interface elements, P. Neto (B) · J. Vinagre along the element boundaries, since the beginning of the analysis. A non-iterative sequentially-linear approach is adopted in order to avoid convergence problems. The aim of the present analysis is to try to better understand the failure mechanisms found in the experimental tests. Despite the complexity of the multiple nonlinear aspects of the behaviour of the structure, it is concluded that the numerical results are similar and are close to those observed experimentally.

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Prestressed fibre‐reinforced polymer laminates for strengthening structures

Cited by 106 publications

References 31 publications

Flexural behaviour of RC slabs strengthened with prestressed CFRP strips using different anchorage systems

Flexural behaviour of RC slabs strengthened with prestressed CFRP strips using different anchorage systems

Analysis of interfacial shear stresses in beams strengthened with bonded prestressed laminates

Numerical modelling of concrete beams reinforced with pre-stressed CFRP

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