(南京工程学院建筑工程学院， 南京 211167)

摘要: 开展了 3 根圆台形钢管混凝土短柱和 1 根圆柱形钢管混凝土短柱轴压试验，保持核心混凝土中部截面直径不变，以钢管混凝土短柱核心混凝土上表面与下表面直径比 α 为试验主要研究参数，对短柱的破坏特征和轴压力学性能进行了分析。 试验结果表明:圆台形钢管混凝土短柱最终破坏形态为上端部钢管鼓屈，钢管与核心混凝土发生分离，试验过程中核心混凝土产生裂缝最终被压碎，α 越大，核心混凝土加载后形态保留越完整；圆台形钢管混凝土短柱和圆柱形钢管混凝土短柱的轴向荷载￣应变曲线基本相同，圆台形钢管混凝土柱具有较大的延性；短柱的极限承载力随着 α 的增大而增大。 基于钢管屈服准则利用极限平衡静力法推导了考虑 α 和钢管内壁与地面夹角 θ 的圆台形钢管混凝土短柱轴压极限承载力计算公式，并验证了公式的合理性。

关键词: 圆台形钢管混凝土； 轴压试验； 力学性能； 极限承载力； 破坏形态

中图分类号:TU398. 7 文献标志码:A 文章编号:1002￣848X(2022)04￣0100￣06

DOI:10. 19701 / j.jzjg.20200354

Axial compression behavior of round￣shaped concrete￣filled steel tube short columns

HUANG Xin， JIANG Jingshan， SUN Tianyang， JIANG Wei

(School of Architectural Engineering， Nanjing Institute of Technology， Nanjing 211167， China)

Abstract: Axial compression tests were performed on 3 round￣shaped concrete￣filled steel tube short columns and 1cylindrical concrete￣filled steel tube short column， keeping the diameter of central section of core concrete unchanged， andusing the diameter ratio α of upper and lower surface of core concrete of concrete￣filled steel tube short column as the mainresearch parameter. The failure characteristics and axial compressive mechanical properties of short columns were analyzed.The test results show that the final failure shape of the round￣shaped concrete￣filled steel tube short column is the upper endsteel tube bulge， and the steel tube is separated from the core concrete. The core concrete crack during the tests and iseventually crushed， and the larger the α， the more complete the shape retention of the core concrete after testing. The axialload￣strain curves of the round￣shaped concrete￣filled steel tube short column and the cylindrical concrete￣filled steel tubeshort column are basically the same， and the round￣shaped concrete￣filled steel tube short column has a large ductility； theultimate bearing capacity of the short column increases with the increase of α. The ultimate equilibrium static force methodbased on the steel tube yield criterion was used to derive the formula for calculating the axial ultimate bearing capacity of around￣shaped concrete￣filled steel tube short column considering the α and the angle θ between the inner wall of the steeltube and the ground， and the rationality of the formula was verified.

Keywords:round￣shaped concrete￣filled steel tube； axial compression test； mechanical performance； ultimate bearingcapacity； failure model

∗国 家 自 然 科 学 基 金 面 上 项 目 ( 51778282， 51678292 )， 江 苏 省 大 学 生 实 践 创 新 训 练 计 划 项 目 ( 201911276016Z，201911276094H)。

第一作者:黄鑫，学士，主要从事钢混结构力学性能研究，Email:2540588261@ qq.com。

[引用本文] 黄鑫，姜景山，孙天洋，等. 圆台形钢管混凝土短柱轴压性能研究 [ J]. 建筑结构，2022，52(4):100￣105. HUANG Xin，JIANG Jingshan，SUN Tianyang，et al. Axial compression behavior of round￣shaped concrete￣filled steeltube short columns[J]. Building Structure，2022，52(4):100￣105.