In the latest revision of the Greek standard for concrete reinforcement steel (ΕΛΟΤ 1421:2007) – in order to improve the performance of concrete framed buildings during an earthquake – a characterisation of rebar steel with regard to ductility was adopted (previous version of the standard were concerned with strength only). Three class of steel have been introduced A, B and C in the order of increased ductility. The highest grade, B500C, was selected for the rebar steel to be used in Greece.
In the figure that follows the results of laboratory testing on three structural members made with identical reiforcement but with steel of class A, B and C are presented. The members were subjected to vertical loads until failure. The supirior performance of Class B500C steel compared to the other two classes can be clearly seen.