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.
Highlights
Li et al [16, 17] conducted an experimental and numerical parametric analysis according to 32 sets of highstrength rectangle concrete-filled steel tube (RCFST) long columns with c 0.13, 0.23, 0.33, and 0.43, respectively, with different λ coupling effects on the RCFST column load-lateral displacement (P-Δ) responses
The statistical analysis of the strain gauge 15 (SG15), on the surface 4 (S4) of the steel tube on the tension side, and the strain gauge 7 (SG7) on the surface 2 (S2) of the steel tube on the compression side are focused as shown in Figure 1(c). e outer envelopes of the load-strain (P-ε) relationships of the RCFST column under the eccentric compressive load are shown in Figure 3 for different values of c and λ
The modified Jezek analytical method was developed using the Maple program to calculate the RCFST columns Pu. e RCFST column instability modes were divided into two types on the yield states of the steel tube tension side
Summary
Li et al [16, 17] conducted an experimental and numerical parametric analysis according to 32 sets of highstrength RCFST long columns with c 0.13, 0.23, 0.33, and 0.43, respectively, with different λ coupling effects on the RCFST column load-lateral displacement (P-Δ) responses. Erefore, a theoretical analysis theory was needed to reveal the contribution of c and λ of RCFST long columns in the instability modes [24] To address this issue, in this work, the 32 RCFST specimens’ load-tension strain (P-ε) relationships and the compressive and tensile strain of the steel tube were analyzed. The implicit function equations of two main instability modes were established based on the modified Jezek analytical method, and the regularization slenderness ratio (λ) was introduced to conduct the elastoplastic theoretical analysis so that the two main instability modes could be expressed scientifically and reasonably in a dimensionless normalized form In this way, the great difference of column length and section size of RCFST long columns was avoided, and the application scope of the analytical method was extended.
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