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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.

The ductility of reinforcement steel is the dominant factor that affects the achievement of a construction that is able to undergo high plastic deformation without colapsing. The higher the ductility the better the performance of the construction since the energy of the earthquake is transfered to all structural memebers (even if some of them are udergoing plastic deformations) effectiely reducing the danger of sudden a collapse.
Ductility is usually measured by either the enlongation at maximum load Agt (%) or the ratio of tensile stregth to yield strength.

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.

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