Work

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

Year: 2025

Type: article

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.

Source: Tạp chí Khoa học Công nghệ Xây dựng (KHCNXD) - ĐHXDHN

DOI: 10.31814/stce.huce2025-19(3)-04

Authors: Nguyen Van Ninh, Pham Tuan Dung, Vu Quang Viet, Zhengyi Kong, Pham Thai Hoan

Institutions: Vietnam Maritime University, University of Aberdeen, VNU Vietnam Japan University, Heriot-Watt University, Hanoi University of Civil Engineering

Language: English

Topic: Structural Load-Bearing Analysis

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: diamond

Funder: National Foundation for Science and Technology Development