Probabilistic sensitivity analysis of a concrete wharf to pitting corrosion and concrete quality
Résumé
Blaye wharf is an old reinforced concrete structure (built in 1933). It is located on Gironde estuary and is exposed to aggressive marine environment which induces safety reduction. A reliability analysis was carried out in order to assess the evolution of the reliability index β with time. After doing a three-dimensional finite element modelling of the wharf through CAST3M software, a linear analysis was undertaken. Dead, live and traffic loads (uniform load and concentrated wheel load) are defined according to Eurocode 2. The SLS (service limit state) reliability index β is computed for "unfavourable" beams and it is assumed in first approximation that all the variables are normally distributed. It is to be noted that it's an element by element reliability analysis rather than a system analysis. Concerning the position of traffic loads, various cases were considered: vehicle centred on longitudinal beam, two wheels centred on the longitudinal beam, vehicle centred on the support, two wheels centred on the support without forgetting braking and/or acceleration forces. It has been shown that the reliability index is not only dependent on the material and load parameters but also on the mechanical model.
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