建筑钢结构进展2023，Vol.25Issue(12)：1-10,10.DOI:10.13969/j.cnki.cn31-1893.2023.12.001
内置T形钢骨-T形钢管混凝土短柱轴压性能试验研究
Experimental Study on the Axial Compression Performance of T-shaped CFST Stub Columns with Inner T-shaped Steel
摘要
Abstract
To study the axial compression performance of special-shaped concrete filled steel tube(CFST)short columns with inner steel,nine T-shaped CFST short columns with inner T-shaped steel and three T-shaped CFST short columns without inner T-shaped steel were tested under axial compression.The failure modes of the specimens were investigated.Besides,the changes of load-strain curves of tube steel,load-strain curves of reinforcing steel,load-average longitudinal strain curves were analyzed.Moreover,the effects of parameters such as steel ratio,steel tube confinement index and built-in steel ratio on the bearing capacity of the specimens were also discussed.The results show that the failure mode of all specimens under axial compression is locally buckling failure.While keeping other factors constant,the ultimate bearing capacity of the specimens increased by 42.9％,56.5％and 67.2％respectively with the increase of the built-in steel ratio from 0 to 39.1％,58.6％and 69.9％.As the growth rate of the steel tube confinement index increases from 24.5％to 62.8％,the ultimate bearing capacity of the specimens respectively increases by 5.4％and 11.1％.However,with the increasing thickness of built-in steel and steel tube,the enhancement ability of the ultimate bearing capacity of the specimen is gradually weakened.Based on the experimental study and parameter analysis,a formula for calculating the ultimate bearing capacity of T-shaped CFST short columns with inner T-shaped steel is proposed.The calculated results are in good agreement with the experimental results.关键词
T形钢管混凝土/内置T形钢骨/套箍指数/配骨率/轴心受压Key words
T-shaped CFST/inner T-shaped steel/confinement index/built-in steel ratio/axial compression分类
建筑与水利引用本文复制引用
苗远,段燕妮,张继承,杜国锋,李元齐..内置T形钢骨-T形钢管混凝土短柱轴压性能试验研究[J].建筑钢结构进展,2023,25(12):1-10,10.基金项目
国家自然科学基金(51778065、51978500) （51778065、51978500）
