Numerical investigation of the axial compressive capacity of reinforced concrete-filled doubleskin steel tubular short columns

  • Nguyen Van Ninh Faculty of Civil Engineering, Vietnam Maritime University, 484 Lach Tray street, Le Chan ward, Hai Phong City, Vietnam
  • Pham Tuan Dung School of Engineering, University of Aberdeen, Fraser Noble Building, Kings College, Aberdeen, AB24 3UE, United Kingdom
  • Vu Quang Viet Faculty of Advanced Technology and Engineering, VNU Vietnam Japan University, My Dinh Campus, Luu Huu Phuoc Road, Tu Liem Ward, Hanoi, Vietnam
  • Zhengyi Kong Institute for Sustainable Built Environment, Heriot-Watt University, Edinburgh, United Kingdom
  • Pham Thai Hoan Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, 55 Giai Phong road, Bach Mai ward, Hanoi, Vietnam
DOI: https://doi.org/10.31814/stce.huce2025-19(3)-04
Keywords: ultimate axial strength, R-CFDST, rebar, FEM, compressive design

Abstract

This study presents a numerical investigation into the axial compressive behavior of reinforced concrete-filled double-skin steel tubular (R-CFDST) columns. A finite element model (FEM) for R-CFDST columns was developed based on validated FE models of both reinforced concrete-filled steel tubular (R-CFST) columns and circular concrete-filled double-skin steel tubular (CFDST) columns. Using the proposed FE model, a comprehensive parametric study was conducted to evaluate the effects of longitudinal reinforcement ratio, geometric dimensions, and material properties on the ultimate axial strength of R-CFDST columns. The results show that increasing the longitudinal reinforcement ratio from 0% to 2.93% enhances the column’s ultimate capacity by up to 17.91%, underscoring the critical role of rebar in enhancing column performance. Furthermore, existing design equations for predicting the ultimate strength of R-CFST and CFDST columns were reviewed and adapted for application to R-CFDST columns. The accuracy of these modified equations was validated against the FE results, and the most accurate formulation was recommended for the compressive design of R-CFDST columns under uniaxial loading.

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Published
25-09-2025
How to Cite
Ninh, N. V., Dung, P. T., Viet, V. Q., Kong, Z., & Hoan, P. T. (2025). Numerical investigation of the axial compressive capacity of reinforced concrete-filled doubleskin steel tubular short columns. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, 19(3), 38–53. https://doi.org/10.31814/stce.huce2025-19(3)-04
Issue
Vol 19 No 3 (2025)
Section
Research Papers

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