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Structural Engineering and Mechanics   Volume 35, Number 3, June20 2010, pages 315-333
DOI: https://doi.org/10.12989/sem.2010.35.3.315
 
Nonlinear finite element analysis of circular concrete-filled steel tube structures
Tengfei Xu, Tianyu Xiang, Renda Zhao and Yulin Zhan

 
Abstract     [Buy Article]
    The structural behaviors of circular concrete filled steel tube (CFT) structures are investigated by nonlinear finite element method. An efficient three-dimensional (3D) degenerated beam element is adopted. Based on those previous studies, a modified stress-strain relationship for confined concrete which introduces the influence of eccentricity on confining stress is presented. Updated Lagrange formulation is used to consider the geometrical nonlinearity induced by large deformation effect. The nonlinear behaviors of CFT structures are investigated, and the accuracy of the proposed constitutive model for confined concrete is mainly concerned. The results demonstrate that the confining effect in CFT elements subjected to combining action of axial force and bending moment is far sophisticated than that in axial loaded columns, and an appropriate evaluation about this effect may be important for nonlinear numerical simulation of CFT structures.
 
Key Words
    concrete-filled steel tube; nonlinear finite element analysis; degenerated beam element; updated lagrange formulation.
 
Address
Tengfei Xu: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, P.R. China
Tianyu Xiang: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, P.R. China
Renda Zhao: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, P.R. China
Yulin Zhan: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, P.R. China
 

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