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Explicit Simulation of Circular CFST Stub Columns with External Steel Confinement under Axial Compression
Faesal Alatshan1,2, Siti Aminah Osman1, Fidelis Mashiri3
1Smart and Sustainable Township Research Centre, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Materials (Basel, Switzerland)
|December 22, 2019
Summary
External steel confinements improve concrete-filled steel tube (CFST) columns by enhancing composite action and compressive strength. This study presents analytical models and design formulations for these improved structural members.
Area of Science:
- Structural Engineering
- Materials Science
Background:
- Concrete-filled steel tube (CFST) members offer high strength and ductility.
- Imperfect composite interaction arises from differing lateral dilation between concrete and steel.
- External steel confinements (rings, spirals) were proposed to improve confinement effects.
Purpose of the Study:
- To analyze the behavior of circular CFST short columns with external ring or spiral confinements under axial loading.
- To investigate the impact of external confinements on composite interaction and structural performance.
Main Methods:
- Development and verification of an explicit finite element (FE) model.
- Analysis of failure modes, load-strain relationships, stress distributions, and bond strength.
- Parametric analysis on material strengths, steel ratio, and diameter-to-thickness ratio.
Main Results:
- External steel confinement enhances compressive behavior more effectively than increasing steel tube thickness for the same steel ratio.
- FE model accurately predicted CFST column behavior based on experimental data.
- Parametric studies revealed key influencing factors on performance.
Conclusions:
- External steel confinements significantly improve the performance of CFST columns.
- Simplified design formulations for ultimate capacity were developed for CFST columns with and without external confinement.
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