Techno Press

Steel and Composite Structures   Volume 19, Number 5, November 2015, pages 1237-1258
Inelastic analysis for the post-collapse behavior of concrete encased steel composite columns under axial compression
V.S. Ky, S. Tangaramvong and T. Thepchatri

Abstract     [Full Text]
    This paper proposes a simple inelastic analysis approach to efficiently map out the complete nonlinear post-collapse (strain-softening) response and the maximum load capacity of axially loaded concrete encased steel composite columns (stub and slender). The scheme simultaneously incorporates the influences of difficult instabilizing phenomena such as concrete confinement, initial geometric imperfection, geometric nonlinearity, buckling of reinforcement bars and local buckling of structural steel, on the overall behavior of the composite columns. The proposed numerical method adopts fiber element discretization and an iterative Muller's algorithm with an additional adaptive technique that robustly yields solution convergence. The accuracy of the proposed analysis scheme is validated through comparisons with various available experimental benchmarks. Finally, a parametric study of various key parameters on the overall behaviors of the composite columns is conducted.
Key Words
    composite column; concrete confinement; concrete encased steel; geometry nonlinearity; inelastic analysis; post-buckling; strain-softening
(1) V.S. Ky, T. Thepchatri:
Department of Civil Engineering, Chulalongkorn University, Bangkok 10330, Thailand;
(2) S. Tangaramvong:
Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;
(3) S. Tangaramvong:
Department of Architecture, Chulalongkorn University, Bangkok 10330, Thailand.

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