Numerical analysis of limit states for circular concrete-filled steel tubular columns based on stiffness degradation

• DOI: 10.1680/jmacr.19.00009
• Publication Date: 2019-07-02T14:25:08Z
• Authors: Minsheng Guan; Qian Xiao; Siying Lin; Jie Cui; Hongbiao Du; Zhichao Lai
• Keywords: Degradation

In this paper, the stiffness degradation index previously proposed by authors is used as a seismic performance for circular concrete-filled steel tubular (CFT) columns. Four levels CFT columns are defined – that is, virtually intact; minor damage; moderate and severe failure. A total of 144 numerically analysed to obtain values each level. The effects several parameters (i.e. axial compression ratio, slenderness diameter-to-thickness yield strength tube, compressive concrete cylinder) on level investigated. results show ratio has substantial effect all levels; significant intact damage An equation estimates value regression analysis further verified using existing experimental results. Based parameter expansion analysis, preliminary limit proposed.