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Long-time concrete-composite interface characterization for reliability prediction of RC beam strengthened with FRP

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Abstract

It is technologically possible to strengthen steel reinforced structures by applying external bonded carbon epoxy composite. The durability and the performance of those reinforcements directly depend on the rheological behavior of concrete-composite interface. From tensile shear thermostimulated tests performed on the interface, we propose a methodology to evaluate the allowable shear stress of the interface by taking into account the effects of time and temperature.

Résumé

Il est technologiquement possible de renforcer des ouvrages en béton armé présentant des comportements pathologiques préoccupants en stratifiant les faces extérieures, de l'ouvrage avec des matériaux composites carbone-époxy. La durabilité et la fiabilité de ces renforcements sont tributaires, pour une large part, de la connaissance du comportement rhéologique de l'interface composite-béton. À partir d'essais de fluage thermo-stimulés en traction-cisaillement de l'interface, nous développons une méthodologie théorico-expérimentale pour estimer les contraintes de cisaillement admissibles du joint de colle en prenant en compte les effets, du temps et de la température.

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Abbreviations

Af :

composite area (mm2)

Ac :

concrete area (mm2)

aTt :

shift factor time

bf:

width of the composite (mm)

D(t,T):

compliance as a function of time and temperature

Ec :

concrete Young's modulus (MPa)

Ef :

composite Young's modulus

f(T), g(T), ai, bi, ad, ai:

rheological parameters

Gadh :

shear modulus (MPa)

G0, G∞, η1, η2:

rheological parameters (MPa)

G1 :

initial shear modulus (MPa)

L:

anchorage length (mm)

N:

load (N)

sadh :

thickness of the adhesive layer

T, T0 :

test and reference temperature (°C)

Tg :

glass transition temperature (°C)

Uc, U:

displacement in concrete and in composite (mm)

w:

constant

δγ12 :

creep rate (m/m/hours)

Δl1 :

average displacement in the adhesive layer (mm)

Δl2 :

composite displacement (mm)

εc, εf :

strain in concrete and composite (m/m)

γadh :

average shear strain (m/m)

τave :

mean shear stress (MPa)

τlave :

initial average shear stress (MPa)

τadh,d :

allowable limit shear stress value (MPa)

τ(X):

shear stress distribution along x axis of the adhesive (MPa)

τ0 :

initial shear stress (MPa)

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Authors and Affiliations

  1. Laboratoire Mécanique Matériaux, Université Lyon 1, 82 bd Niels Bohr, Domaine scientifique de la Doua, 69622, Villeurbanne, France

    E. Ferrier & P. Hamelin

Authors
  1. E. Ferrier
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  2. P. Hamelin
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Editorial Note Prof. Patrice Hamelin is a RILEM Senior Member.

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Ferrier, E., Hamelin, P. Long-time concrete-composite interface characterization for reliability prediction of RC beam strengthened with FRP. Mat. Struct. 35, 564–572 (2002). https://doi.org/10.1007/BF02483125

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  • DOI: https://doi.org/10.1007/BF02483125

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