Preventive fatigue strenghthening of steel structures with bonded CFRP Efficiency demonstration on a real bridge
Résumé
One of the goals of sustainable development applied to bridge infrastructure is to provide bridge owners with strengthening solutions that may lead to an increase of existing structures service life. In the case of steel bridges, the assessment of the remaining service life is most often linked to the determination of the structural deterioration caused by corrosion and fatigue. Damage caused by fatigue is very difficult to assess before crack initiation, and is more bound to occur in old structures, for which the phenomenon was not taken into account in design before 1970. In addition, old steel materials present a more brittle behavior. To address these issues, a preventive methodology for fatigue strengthening of steel structures and a strengthening solution based on the use of an adhesively bonded UHM (Ultra High Modulus) CFRP (Carbon Fiber Reinforced Polymer) plate was developed and applied to an existing bridge (Jarama bridge near Madrid in Spain) for validation. Strain measurement was carried out to verify the theoretical expectations of the reinforcement, and different parameters were studied such as the influence of low traffic during reinforcement application. The obtained results proved the efficiency of the system for the studied structure.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)