Abstract
Finite element analysis (FEA) is conducted to investigate the structural behaviour of axially-loaded ultra-high strength concrete (UHSC) filled steel tube circular columns in this paper. A new stress-strain model of UHSC confined by circular steel tube is proposed by recalibrating the existing normal strength concrete constitutive model. The comparison between FEA predictions and test results indicates that the proposed FEA model is able to capture the brittleness characteristic of UHSC in circular CFST columns accurately. Based on the proposed FEA model, the structural performance of axially-loaded UHSC filled steel tube circular columns, including load versus deformation relationship, stress development, confinement effect and preliminary optimized design, are analysed and discussed. Finally, a parametric study is conducted to investigate the influence of key parameters on the load-deformation curve and strength utilization index of axially-loaded UHSC filled steel tube circular column during the entire loading process.
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