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Coupling Effect of Eccentricity and Slenderness Ratios on RCFST Column Instability Modes

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  • Chao Guo
  • Zhengran Lu

Abstract

The instability damage modes of rectangle concrete-filled steel tube (RCFST) columns that are subjected to eccentric compression can be divided into two types based on the modified Jezek analytical procedure, namely, the eccentricity ratio ( γ ) and the slenderness ratio ( λ ) coupling effect. The RCFST columns have unilateral compression yield failure mode when γ is small. However, it has compressive and tensile mode on both sides when the value of γ is large. In this work, parametric analyses were performed to test 32 RCFST long columns by varying γ with different λ combinations. From the analysis, it was found that the results of the theoretical analysis of the load-tension strain ( P-ε ) responses and the instability modes of the RCFST long columns are similar to the experimental results. Further, the proposed analytical method aids in better understanding the effects of γ and λ coupling on the stability behavior of the RCFST columns.

Suggested Citation

  • Chao Guo & Zhengran Lu, 2021. "Coupling Effect of Eccentricity and Slenderness Ratios on RCFST Column Instability Modes," Mathematical Problems in Engineering, Hindawi, vol. 2021, pages 1-10, October.
    • Handle: RePEc:hin:jnlmpe:6530425
    DOI: 10.1155/2021/6530425
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