Author(s)

A.P. Fantilli, D. Ferretti, I. lori & P. Vallini

Abstract

A mechanical model for compressed concrete in R/C beams A.P. Fantilli*, D. Ferretti*, I. lori^ & P. Vallini' Department of Structural and Geotechnical Engineering, Politecnico di Torino, Torino, Italy. Department of Civil Engineering, University of Parma, Parma, Italy. Abstract The distribution of stress in the compression zone of R/C beams subjected to flexure is usually computed by means of uniaxial stress-strain relationships. When crushing of compressed concrete occurs, the effect of curvature (or strain gradient) becomes important and uniaxial stress-strain curves are no more representative of physical evidence. To overcome this difficulty, in this paper crushing of concrete is modelled by means of sliding planes, which allow the expulsion of v-shaped concrete blocks. The mathematical description of the mechanical behaviour of this sliding phenomenon leads to a stress-strain relationship for concrete with a particular softening branch whose shape depe

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