Abstract
Safety factors proposed in codes CEB, B.A.E.L 91 and EUROCODE 1 cover a great number of uncertainties; making them inadequate for the assessment of existing structures. Suitable safety factors are established using a probabilistic assessment, once real dimensions, materials strength and existing structures deterioration mechanisms are taken into account. This paper presents a calibration method for safety factors using a typical set of RC bridges in France. It considers the principal stages of corrosion provoked by <TEX>$CO_2$</TEX> and <TEX>$Cl^-$</TEX> penetration and threshold indexes (<TEX>${\beta}_0$</TEX>) for existing structures. Reliability indexes are determined by the FORM method in the calibration method.
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