Open AccessCoupling Effect of Eccentricity and Slenderness Ratios on RCFST Column Instability Modes
Author(s) -
Chao Guo,
Zhengran Lu
Publication year - 2021
Publication title -
mathematical problems in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.262
H-Index - 62
eISSN - 1026-7077
pISSN - 1024-123X
DOI - 10.1155/2021/6530425
Subject(s) - eccentricity (behavior) , buckling , instability , structural engineering , rectangle , materials science , coupling (piping) , compression (physics) , ultimate tensile strength , yield (engineering) , tension (geology) , parametric statistics , composite material , mechanics , mathematics , engineering , physics , geometry , statistics , political science , law
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.