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Earthquakes and Structures
  Volume 9, Number 3, September 2015 , pages 503-539

Hardening slip model for reinforcing steel bars
Franco Braga, Silvia Caprili, Rosario Gigliotti and Walter Salvatore

    A new constitutive model for the representation of the seismic behaviour of steel bars including hardening phenomena is presented. The model takes into account relative slip between bars and concrete, necessary for the estimation of the structural behaviour of r.c. elements and of the level of strain induced by earthquakes on bars. The present work provides the analytical formulation of the post-yielding behaviour of reinforcements, resulting in a continuous axial stress-slip relationship to be implemented in engineering software. The efficacy of the model is proved through the application to a cantilever column, for whose bars the constitutive law is derived.
Key Words
    relative slip; hardening effects; cyclic behavior; stress-slip relationship; reinforcing bars
Franco Braga,Rosario Gigliotti: Department of Structural Engineering and Geotechnics, University of Rome

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