Behavior of axially loaded circular stainless steel tube confined concrete stub columns
Behavior of axially loaded circular stainless steel tube confined concrete stub columns
复制标题
轴向受载圆形不锈钢管约束混凝土短柱的性能
DOI：
10.1016/j.tws.2019.02.014
复制
发表时间：
2019-06-01
影响因子：
6.4
通讯作者：
Huang, Haijia
中科院分区：
文献类型：
--
作者：
Guo, Lanhui;Liu, Yong;Huang, Haijia
不锈钢管约束混凝土短柱是一种新型的钢-混凝土组合柱形式，它利用不锈钢管约束核心混凝土而不直接承受轴向荷载。钢管混凝土柱可以同时发挥不锈钢管和钢管混凝土柱的优点。本文对钢管混凝土圆形短柱进行了轴压试验研究。同时，对不锈钢圆钢管混凝土与不锈钢空心圆钢管进行了对比试验。详细介绍了试件的实验现象，并对实验结果进行了分析。通过对不锈钢管轴向应力和环向应力的研究，分析了不锈钢管与核心混凝土的相互作用。试验结果表明，不锈钢管对核心混凝土起到了约束作用，显著提高了核心混凝土的抗压承载力。钢管混凝土短柱中不锈钢管的约束作用大于钢管混凝土短柱。因此，钢管混凝土柱的承载力高于不锈钢钢管混凝土柱。此外，还提出了钢管混凝土柱和不锈钢钢管混凝土柱的承载力计算公式。计算结果与实验结果吻合较好。
Stainless steel tube confined concrete (SSTCC) stub column is a new form of steel-concrete composite column in which the stainless steel tube is used to confine the core concrete without resistance to the axial load directly. It could take the advantages of both the stainless steel tube and the steel tube confined concrete columns. This paper presents the experimental investigation of circular SSTCC stub columns subjected to axial load. Meanwhile, comparative tests of the circular concrete-filled stainless steel tubes and circular hollow stainless steel tubes were also conducted. The experimental phenomena of specimens are introduced in detail and the experimental results are analyzed. Through the investigation of axial stress and hoop stress on the stainless steel tube, the interaction between stainless steel tube and core concrete is studied. The experimental results showed that the stainless steel tube provides confinement to the core concrete, increasing the compressive capacity of core concrete significantly. In addition, the confinement of stainless steel tube in SSTCC stub columns is larger than that in concrete-filled stainless steel tubes. Therefore, the load-carrying capacity of SSTCC columns is higher than that of concrete-filled stainless steel tubes. Besides, an equation was proposed to calculate the load-carrying capacities of SSTCC columns and concrete-filled stainless steel tube columns. The calculated results agree well with the experimental results.