Behavior and design of eccentrically-loaded slender tubed steel-reinforced high-strength concrete columns. (June 2023)

• Record Type: Journal Article
• Authors: Li, Xiang; Wang, Xuanding; Liu, Jiepeng; Chen, Y. Frank
• Is Part Of: Journal of constructional steel research. Volume 205(2023)
• Publication Date: 2023-06
• Subjects: Tubed steel-reinforced-concrete (TSRC) -- High-strength concrete (HSC) -- Eccentric compression -- Numerical analysis -- Design method; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2023.107907
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: This study experimentally and numerically investigated the behavior of eccentrically-loaded slender circular tubed steel-reinforced concrete (CTSRC) columns filled with high-strength concrete (HSC). Six specimens with the HSC of 81.4 MPa were tested considering the length-to-diameter ratio and load eccentricity; and their effects on the failure phenomenon, bearing capacity, and ductility were evaluated. A three-dimensional finite element model was established and validated for further investigating the column behavior. The study results indicate that all specimens fail in a flexural failure mode and show good ductility; and the shear studs and circular steel tube are found to ensure the composite behavior of CTSRC columns. Besides, increasing the tube thickness contributes more to the improvement of column ductility than the load capacity and the steel shape yields before the peak load, indicating the full utilization of steel strength. Based on the parametric study, a design method considering the second-order effect and the influence of unequal load eccentricities at both column ends is proposed to assist designers to determine the load capacity of slender CTSRC columns. Highlights: The eccentrically-loaded performance of slender CTSRC columns with HSC was investigated. Effects of length-to-diameter ratio and load eccentricity were studied. A design method for the strength of slender CTSRC columns under eccentric compression is proposed and verified.