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<p>The study presents a numerical finite element analysis of the circular concrete filled steel tubular (CFST) columns under the combined effect of compression and bending. A 3D finite element model has been developed considering material nonlinearity. The concrete core of the CFST column has been modeled by adopting “Gradient Enhanced Microplane Damage Plasticity Model”. The developed FE models have been used to simulate experimental studies done by past researchers. Numerical analysis and previous experimental findings have shown to be in good agreement, establishing the validity and reliability of the current FE modeling scheme. Further parametric studies have been done to generate P-M (axial compression and bending moment) interaction diagrams for a few standard HSS sections. Two approaches named “combined P-M approach” and “eccentric point load approach” have been adopted to generate the interaction diagrams. Then these diagrams have been compared with the diagrams produced by using AISC code equations. It has been found that the AISC equations give conservative predictions than the predictions given by the finite element analysis. Again, among the two FE approaches, the “eccentric point load approach” gives more conservative predictions than that of the “combined P-M approach”. The material parameters of the concrete microplane model have been found to have a very crucial role in the simulation process to capture the behavior of the confined concrete core of the CFST columns. The findings may provide insights that could contribute to future improvements in code provisions making the design cost effective without compromising the safety of the structures.</p>

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Non linear finite element study on circular CFST columns under combined compression and bending and comparison with AISC provision using microplane model

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Modhupom Choudhury,
  • Khan Mahmud Amanat

摘要

The study presents a numerical finite element analysis of the circular concrete filled steel tubular (CFST) columns under the combined effect of compression and bending. A 3D finite element model has been developed considering material nonlinearity. The concrete core of the CFST column has been modeled by adopting “Gradient Enhanced Microplane Damage Plasticity Model”. The developed FE models have been used to simulate experimental studies done by past researchers. Numerical analysis and previous experimental findings have shown to be in good agreement, establishing the validity and reliability of the current FE modeling scheme. Further parametric studies have been done to generate P-M (axial compression and bending moment) interaction diagrams for a few standard HSS sections. Two approaches named “combined P-M approach” and “eccentric point load approach” have been adopted to generate the interaction diagrams. Then these diagrams have been compared with the diagrams produced by using AISC code equations. It has been found that the AISC equations give conservative predictions than the predictions given by the finite element analysis. Again, among the two FE approaches, the “eccentric point load approach” gives more conservative predictions than that of the “combined P-M approach”. The material parameters of the concrete microplane model have been found to have a very crucial role in the simulation process to capture the behavior of the confined concrete core of the CFST columns. The findings may provide insights that could contribute to future improvements in code provisions making the design cost effective without compromising the safety of the structures.