Experimental study on the seismic performance of concrete-filled steel tube columns with a multiple-chamber round-ended cross-section

• DOI: 10.3389/fmats.2024.1363206
• Publication Date: 2024-02-22T04:52:22Z
• Authors: Jing Liu; Wenzuo Yu; Yawei Fang; Zimao Pan
• Keywords: Ductility (Earth science); Hysteresis

Reinforced concrete bridge piers with round-ended sections are susceptible to bending, bending–shear, and shear failure after earthquakes in high-intensity areas, thus necessitating improved seismic performance. This study introduced a novel design for concrete-filled steel tube (CFST) column, featuring multi-chambered, cross-section. The use of longitudinal transverse stiffeners divided the column section into distinct chambers, thereby enhancing performance columns. A total 12 groups static tests were performed examine effect chamber layout, axial compression ratio, aspect ratio on columns’ hysteresis behavior, curves, skeleton modes, stiffness degradation, ductility, energy dissipation capacity obtained. Results demonstrated favorable composite Additionally, an increase chambers led full curve, bearing capacities. displacement ductility coefficient ( μ ) ranged between 3.88 7.45, parameters have minimal influence degradation beam. Based results, long short sides CFST columns large length–width should be arranged relatively close length.