Annex L draft of the next Eurocode 2 establishes classes of steel fiber-reinforced concrete (SFRC) based on the residual flexural strength for two crack mouth opening displace- ments, CMOD (f , w = 0.5 mm, and f , w =…
Annex L draft of the next Eurocode 2 establishes classes of steel fiber-reinforced concrete (SFRC) based on the residual flexural strength for two crack mouth opening displace- ments, CMOD (f , w = 0.5 mm, and f , w = 2.5 mm). However, this classification does not R,1k M R,3k M consider the residual compressive strength of SFRC, , defined as the compressive stress for a R strain exceeding three times the strain at the compressive peak [Hormigón y Acero 2018; 69(S1):75–80]. In this work we apply the Response Surface Methodology on two databases of compression and bending experimental results to correlate the structural classes defined in Eurocode 2 with the compressive residual strength of SFRC. The Analysis of Variance determines which factors have a real influence in the studied responses, namely f , f and . Results show R,1k R,3k R that the volume fraction of steel fiber, , the aspect ratio of the fiber, and the compressive f strength of SFRC, f , are statistically significant for f . In addition to these parameters, the length cuf R,1k of the fiber, ℓ, is also significant for f . Finally, a relationship has been found between , f f R,3k R R,1k and f /f so that could be included as an additional parameter defining the Eurocode 2 R3,k R1,k R classes for SFRC.