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Computers and Concrete
  Volume 7, Number 4, August 2010 , pages 303-315

Stress resultant model for ultimate load design of reinforced-concrete frames: combined axial force and bending moment
Ba-Hung Pham, Luc Davenne, Delphine Brancherie and Adnan Ibrahimbegovic

    In this paper, we present a new finite Timoshenko beam element with a model for ultimate load computation of reinforced concrete frames. The proposed model combines the descriptions of the diffuse plastic failure in the beam-column followed by the creation of plastic hinges due to the failure or collapse of the concrete and or the re-bars. A modified multi-scale analysis is performed in order to identify the parameters for stress-resultant-based macro model, which is used to described the behavior of the Timoshenko beam element. The micro-scale is described by using the multi-fiber elements with embedded strain discontinuities in mode 1, which would typically be triggered by bending failure mode. A special attention is paid to the influence of the axial force on the bending moment - rotation response, especially for the columns behavior computation.
Key Words
    reinforced concrete frames; macro model; embedded discontinuities.
Ba-Hung Pham, Luc Davenne and Adnan Ibrahimbegovic: Ecole Normale Superieure de Cachan - Laboratoire de Mecanique et Technologie 61, av. du president Wilson, 94235 Cachan cedex, France
Delphine Brancherie: Universite de Technologie de Compiegne - Laboratoire Roberval BP 20529, 60205 Compiegne Cedex, France

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