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Structural Engineering and Mechanics   Volume 36, Number 4, November10 2010, pages 421-445
Nonlinear analysis of 3D reinforced concrete frames: effect of section torsion on the global response
Hamid R. Valipour and Stephen J. Foster

Abstract     [Buy Article]
    In this paper the formulation of an efficient frame element applicable for nonlinear analysis of 3D reinforced concrete (RC) frames is outlined. Interaction between axial force and bending moment is considered by using the fibre element approach. Further, section warping, effect of normal and tangential forces on the torsional stiffness of section and second order geometrical nonlinearities are included in the model. The developed computer code is employed for nonlinear static analysis of RC sub-assemblages and a simple approach for extending the formulation to dynamic cases is presented. Dynamic progressive collapse assessment of RC space frames based on the alternate path method is undertaken and dynamic load factor (DLF) is estimated. Further, it is concluded that the torsional behaviour of reinforced concrete elements satisfying minimum standard requirements is not significant for the framed structures studied.
Key Words
    concrete structures; dynamic analysis; frame; progressive collapse; softening.
Hamid R. Valipour: School of Civil and Environmental Engineering, University of Technology (UTS), Sydney, Australia
Stephen J. Foster: School of Civil and Environmental Engineering, The University of New South Wales (UNSW),
Sydney, Australia

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