The challenge of the performance-based approach for the design of reinforced concrete structures in chloride bearing environment

• The probabilistic model proposed by fib was used for the design of RC element in the splash zone.
• Different combinations of concrete composition and type of reinforcement were considered.
• Definition of input parameters for the model was a critical issue.
• Values for the input parameters were determined through literature survey.
• The model sensitivity to the estimated input values depended on the type of steel.

The performance-based approach, published by the International Federation for Structural Concrete (fib), was applied for the design of a RC element in a marine environment, with corrosion resistant reinforcement, to analyse the potentiality of the model as well as the possible reasons which limit its use. Results showed that the fib model allows to compare different solutions and to consider the benefits connected with the use of preventative measures. However the definition of reliable values for some input parameters, as the critical chloride threshold for corrosion resistant reinforcement, is demanded to the designer and this aspect clearly limits a widespread use.