东南大学学报（自然科学版）2026，Vol.56Issue(7)：947-954,8.DOI:10.3969/j.issn.1001-0505.2026.07.001
纤维增强混凝土外包钢管组合柱轴压性能的试验与理论研究
Axial compression behavior of FRC-encased steel tubular composite columns:Experimental and theoretical studies
摘要
Abstract
To address corrosion issues in traditional concrete-filled steel tubular columns under extremely cor-rosive environments,a novel fiber-reinforced concrete-encased circular steel tubular composite column was proposed,and the experimental and theoretical research on its axial compression behavior was conducted.Four specimens were designed,including pure steel tube(ST),normal concrete-encased steel tube(NC-ST),high-performance concrete-encased steel tube(HPC-ST),and ultra-high toughness cementitious composite-encased concrete-filled steel tube(UHTCC-CFST).Based on experimental and theoretical analyses,an axial compressive bearing capacity calculation model considering local buckling of the inner steel tube was devel-oped.Test results show that ST yields at the load of 1 552 kN.NC-ST exhibites a 45.8%higher yield load(2 264 kN)but 50%lower yield strain than ST.HPC-ST achieves the highest peak load(5 921 kN),but failes rapidly after the peak.After reaching the peak load(5 020 kN),the UHTCC-CFST exhibites a slow de-crease in bearing capacity.The axial strain corresponding to the point where the bearing capacity reaches 0.85 times the ultimate load exceeds 1.54%,which is 4.53 times the ultimate strain,demonstrating excellent ductility reserve.The proposed theoretical calculation model for axial compressive bearing capacity can pro-vide a design basis for the engineering application of composite columns with externally wrapped steel tubes.关键词
纤维增强混凝土/组合柱/局部屈曲/高性能混凝土/超高韧性水泥基复合材料Key words
fiber-reinforced concrete/composite column/local buckling/high-performance concrete(HPC)/ultra-high toughness cementitious composite(UHTCC)分类
建筑与水利引用本文复制引用
童精中,陈云龙,俞超群,李庆华,徐世烺..纤维增强混凝土外包钢管组合柱轴压性能的试验与理论研究[J].东南大学学报（自然科学版）,2026,56(7):947-954,8.基金项目
浙江省自然科学基金资助项目(LR24E080002) （LR24E080002）
国家自然科学基金资助项目(52522803,52508234). （52522803,52508234）
