Author(s)

A. Carpinteif, G. Ferro & G. Ventura

Abstract

A bridged-crack model is proposed which reproduces the constitutive flex- ural response of reinforced concrete members with fibers. Two different re- inforcements, the longitudinal bars (primary reinforcement) and the fibers (secondary reinforcement) distributed in the brittle cementitious matrix are considered. The bridging actions exerted by the reinforcements onto the crack faces are assumed as rigid-perfectly-plastic for the primary ones and as cohesive softening for the fibers. From dimensional analysis, it comes out that the constitutive flexural response depends on three dimensionless parameters. The first one, Ewe, controls the extension of the process zone. The remaining two parameters, called brittleness numbers Np and Np\ are related to the reinforcement phases. The role

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