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Sainte-Foy-lès-Lyon, France

Chataigner S.,Siksha O' Anusandhan University | Gagnon A.,DL Autun CETE de Lyon | Quiertant M.,University Paris Est Creteil | Benzarti K.,University Paris Est Creteil | Aubagnac C.,DL Autun CETE de Lyon
Revue des Composites et des Materiaux Avances

Nowadays, externally bonded composites are currently used for the rehabilitation or strengthening of concrete infrastructures. Such a technique allows to increase the service life of concrete bridges. In the case of steel structures, this technique is much less popular. This may be due to the similarity of composites and steel in terms of stiffness, but also to the reluctance of infrastructures owners with regards to structural adhesive bonding. This article first introduces the adhesive bonding technique and its advantages, and discusses the stress transfer mechanisms at the composite/steel interface. Then, influence of hydrothermal ageing (at 40°C and 50% relative humidity) or pseudo fatigue cycles on the characteristics of the composite/steel adhesive bond is investigated in order to assess the durability. Although further work is needed, those preliminary results show that the bonding of external composite reinforcements is a suitable technique for steel structures. © 2012 Lavoisier. Source

Structural adhesive bonding is getting very popular in civil engineering either for strengthening operations involving the bonding of external reinforcements or to replace traditional assembly techniques in new structures. However adhesive bonding induces stress concentrations at the edges of the joint, and many studies were undertaken in order to reduce these phenomena and increase the capacity and service life of the assembly. A crucial issue is to optimize shear stress transfer in adhesively bonded joints. This paper investigates the role of hydrostatic pressure on the ultimate capacity of epoxy adhesives used in civil engineering. This led us to investigate a new curved joint geometry that naturally creates compressive stresses at the edge of the joint. In a first part, classical modelling is conducted to determine how the geometry affects the stress field within the joint. Then, fracture mechanics is used to investigate crack propagation. Complementary experimental investigations are finally presented, i.e., quasi-static tests which compare classical shear lap joints to curved joints. Experimental results are thus exploited using the abovementioned modelling. © 2012 Lavoisier. Source

Chataigner S.,Siksha O' Anusandhan University | Flety A.,DL Autun CETE de Lyon | Aubagnac C.,DL Autun CETE de Lyon | Quiertant M.,University Paris Est Creteil | Benzarti K.,University Paris Est Creteil
Revue des Composites et des Materiaux Avances

The single lap shear test is a suitable method for the characterization of FRP-toconcrete bonded interfaces. It provides experimental data which are commonly required in the design procedure of externally bonded composite reinforcements. This article proposes a detailed description of the single lap shear test and discusses the dispersion of experimental data. The test procedure has since been adopted for several investigations confirming its suitability and robustness for many different reinforcement processes. © 2012 Lavoisier. Source

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