Numerical modeling of axially loaded circular concrete-filled double steel tubular short columns, Part I: formulation

MIZAN Ahmed, Qing Quan Liang, Vipulkumar Ishvarbhai Patel, Muhammad Najib S Hadi

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


The confinement provided by the inner and outer steel tubes to the core
concrete significantly increases the load-carrying capacity and ductility of circular concrete-filled double steel tubular (CFDST) columns. The confinement models for conventional concrete-filled steel tubular (CFST) columns may underestimate the ultimate strength of CFDST columns. This paper presents a numerical model developed using the fiber element method for simulating the inelastic behavior of CFDST short columns under axial loading. Based on the published test data, a new confining pressure model recognising the confinement effect offered by double steel tubes is developed for the core concrete in CFDST columns. To capture the postpeak behavior of the confined concrete, a strength degradation parameter is proposed and incorporated in the numerical model. The formulation of the numerical model is described. The validation of the numerical modeling technique developed and the parametric study are given in a companion paper.
Original languageEnglish
Title of host publication13th International Conference on Steel, Space and Composite Structures
PublisherUWA Publishing
Number of pages8
Publication statusPublished - 31 Jan 2018
Externally publishedYes

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