Interface law for FRP–concrete delamination

Ferracuti, Barbara; Savoia, Marco; Mazzotti, Claudio

doi:10.1016/j.compstruct.2006.07.001

Cited by 200 publications

(66 citation statements)

References 15 publications

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“…This is the test procedure most frequently used by researchers to measure bond strength. A number of recent studies based on this method have been published, specifically, by Yao et al (2005); Sharma et al (2006);Ferracuti et al (2007); Toutanji et al (2007), and Mazzotti et al (2009).…”

Section: Introductionmentioning

confidence: 99%

Effect of Adhesive Thickness and Concrete Strength on FRP-Concrete Bonds

2012

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Abstract:The use of fiber-reinforced polymer (FRP) composites for strengthening, repairing, or rehabilitating concrete structures has become more and more popular in the last 10 years. Irrespective of the type of strengthening used, design is conditioned, among others, by concrete-composite bond failure, normally attributed to stress at the interface between these two materials. Single shear, double shear, and notched beam tests are the bond tests most commonly used by the scientific community to estimate bond strength, effective length, and the bond stress-slip relationship. The present paper discusses the effect of concrete strength and adhesive thickness on the results of beam tests, which reproduce debonding conditions around bending cracks much more accurately. The bond stress-slip relationship was analyzed in a cross section near the inner edge, where stress was observed to concentrate. The ultimate load and the bond stress-slip relationship were visibly affected by concrete strength. Adhesive thickness, in turn, was found to have no significant impact on low-strength concrete but a somewhat greater effect on higher strength materials.

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Section: Introductionmentioning

confidence: 99%

Effect of Adhesive Thickness and Concrete Strength on FRP-Concrete Bonds

2012

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“…Moreover, it implicitly assumes that the deformation of the substrate is negligible. Indeed, this is a general hypothesis supported by the greatest majority of authors (see also Carrara et al (2011);Ferracuti et al (2007); Mazzotti et al (2008)), because it gives substantial simplification in the modelling. Consequently the slip, i.e., the relative displacement between stiffener and substrate, is evaluated by simply integrating the axial strain in the stiffener.…”

Section: Introductionmentioning

confidence: 87%

Cohesive debonding of a stiffener from an elastic substrate

Franco

Royer-Carfagni

2014

Composite Structures

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To strengthen concrete or masonry, a modern technique uses adherent strips made of Fiber Reinforced Polymer (FRP). A model problem for this is here considered, represented by an elastic stiffener pulled at one end, in adhesive contact with an elastic half space in generalized plane stress. An analytical solution is developed under the hypothesisà la Baranblatt that cohesive adhesion forces remain active between the two materials when relative slip occurs (provided this is less than a critical value), so that the stress singularity predicted by the theory of elasticity in the case of perfect bonding is removed. We find that the bond length beyond which no further increase of strength could be achieved, referred to as the effective bond length, coincides in practice with the ultimate length of the cohesive zone, i.e., its maximal extension prior that the critical slip limit is attained. The debonding process in a pull-out experiment is analyzed in detail. Results are in better agreement with experimental data than those obtainable with traditional models, which neglect as a rule the deformation of the substrate.

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“…Numerous numerical models have been proposed in the literature to model the complex interaction between the reinforcement and the masonry support, particularly with reference to the debonding of the FRP reinforcement and to the delamination whose simulation requires a proper bond slip behaviour. The latter aspect is usually crucial to assess the overall bearing capacity of a strengthened structure and has been investigated [5], [6], even considering a curved support [7] by means of the formulation of specific constitutive laws able to adequately simulate the propagation of damage and the progressive transfer of the tangential force along the FRP-masonry interface. A simple and reliable finite element model, specifically conceived for the analysis of FRP-reinforced masonry arches, has been recently proposed by Bertolesi et al [8].…”

Section: Introductionmentioning

confidence: 99%