TY - JOUR
T1 - Behavior of eccentrically loaded UHPC filled circular steel tubular short columns
AU - Wang, Qiuwei
AU - Liang, Lin
AU - Lui, Eric M.
AU - Shi, Qingxuan
N1 - Funding Information:
The research described in this article was supported by the National Natural Science Foundation of China (Grant No.: 51878543 and 51878540 ). Their supports are sincerely appreciated.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/6
Y1 - 2022/6
N2 - This paper presents experimental results of twelve eccentrically loaded short composite columns made by filling circular steel tubes with ultra-high performance concrete (UHPC) cured under room temperature. Using these test data as benchmarks, finite element models are developed and used to perform parametric studies to determine how the capacities of these columns are affected by load eccentricity and tube diameter-to-thickness ratio. In addition, a relationship between the balanced eccentricity ratio and the confinement coefficient is established. The results of the present study have shown that: (1) failure of these columns is characterized by yielding of the steel tubes, followed immediately by failure of the core concrete; (2) a decrease in diameter-to-thickness ratio increases the peak load and improves the column's post-peak behavior; (3) an increase in the load eccentricity ratio results in a reduction of the load capacity, ductility and stiffness of the column; (4) the compressive strain in the steel tube develops more rapidly due to second-order effect, and the assumption that plane sections remain plane no longer applies when the applied load reaches 80% of the peak load. By comparing the axial force – Bending moment (Nu-Mu) interaction diagrams generated in the present study with existing codes, it is found that the code equations are mostly conservative.
AB - This paper presents experimental results of twelve eccentrically loaded short composite columns made by filling circular steel tubes with ultra-high performance concrete (UHPC) cured under room temperature. Using these test data as benchmarks, finite element models are developed and used to perform parametric studies to determine how the capacities of these columns are affected by load eccentricity and tube diameter-to-thickness ratio. In addition, a relationship between the balanced eccentricity ratio and the confinement coefficient is established. The results of the present study have shown that: (1) failure of these columns is characterized by yielding of the steel tubes, followed immediately by failure of the core concrete; (2) a decrease in diameter-to-thickness ratio increases the peak load and improves the column's post-peak behavior; (3) an increase in the load eccentricity ratio results in a reduction of the load capacity, ductility and stiffness of the column; (4) the compressive strain in the steel tube develops more rapidly due to second-order effect, and the assumption that plane sections remain plane no longer applies when the applied load reaches 80% of the peak load. By comparing the axial force – Bending moment (Nu-Mu) interaction diagrams generated in the present study with existing codes, it is found that the code equations are mostly conservative.
KW - Axial force – bending moment interaction equations
KW - Concrete-filled steel tube (CFST) columns
KW - Eccentric loading
KW - Finite element analysis
KW - Ultra-high performance concrete (UHPC)
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U2 - 10.1016/j.jcsr.2022.107282
DO - 10.1016/j.jcsr.2022.107282
M3 - Article
AN - SCOPUS:85128652920
SN - 0143-974X
VL - 193
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
M1 - 107282
ER -