Compressive behavior of steel-fiber reinforced concrete in Annex L of new Eurocode 2

Abstract

This paper describes the model for the compressive stress-strain behavior of steel fiber-reinforced concrete (SFRC) in Annex L of the new Eurocode 2 (version 2022-05, EC2), developed within CEN TC250/SC2/WG1/TG2 – Fiber reinforced concrete. The model uses functions obtained from correlations with an extensive database comprised of 197 well-documented SFRC compressive tests and 484 flexural tests. We detailedly explain the model and derive the strain values for the parabola-rectangle model for ULS of SFRC in Annex L. In addition, we also use the model and the correlations with the database to provide a link between the compressive and the flexural performance classes in EC2, which allows a complete definition of any particular SFRC. Likewise, we derive parabola-rectangle strain values for each flexural performance class, which is mainly advantageous for the stronger flexural classes. Finally, we give an example showing the enhancement in strength and ductility of a composite steel-SFRC section endorsed with the new model, which results of 15% and 100%, respectively.