Nonlinear finite element analysis of circular concrete-filled steel tube structures
Tengfei Xu,Tianyu Xiang,Renda Zhao,Yulin Zhan
Abstract
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.
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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