The behavior of H-shaped honeycombed stub columns with rectangular concrete-filled steel tube flanges (STHCCs) subjected to axial load was investigated experimentally. A total of 16 specimens were studied, and the main parameters varied in the tests included the confinement effect coefficient of the steel tube (ξ), the concrete cubic compressive strength (f_cu), the steel web thickness (t₂), and the slenderness ratio of specimens (λ_s). Failure modes, load-displacement curves, load-strain curves of the steel tube flanges and webs, and force mechanisms were obtained by means of axial compression tests. The parameter influences on the axial compression bearing capacity and ductility were then analyzed. The results showed that rudder slip diagonal lines occur on the steel tube outer surface and the concrete-filled steel tube flanges of all specimens exhibit shear failure. Specimen load-displacement curves can be broadly divided into elastic deformation, elastic-plastic deformation, and load descending and residual deformation stages. The specimen axial compression bearing capacity and ductility increase with increasing ξ, and the axial compression bearing capacity increases gradually with increasing f_cu, whereas the ductility decreases. The ductility significantly improves with increasing t₂, whereas the axial compression bearing capacity increases slightly. The axial compression bearing capacity decreases gradually with increasing λ_s, whereas the ductility increases. An analytical expression for the STHCC short column axial compression bearing capacity is established by introducing a correction function (), which has good agreement with experimental results. Finally, several design guidelines are suggested, which can provide a foundation for the popularization and application of this kind of novel composite column in practical engineering projects.

中文翻译：

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矩形钢管混凝土法兰H形蜂窝短柱轴向荷载试验研究

试验研究了带有矩形钢管混凝土法兰 (STHCC) 的 H 形蜂窝短柱在轴向荷载作用下的行为。共研究了 16 个试件，试验中变化的主要参数包括钢管的约束效应系数（ξ）、混凝土立方抗压强度（f _cu）、钢腹板厚度（t ₂）和试样长细比 ( λ _s）。通过轴向压缩试验获得了钢管法兰和腹板的破坏模式、载荷-位移曲线、载荷-应变曲线以及受力机制。然后分析了参数对轴向压缩承载力和延性的影响。结果表明，钢管外表面均出现舵滑斜线，所有试件的钢管混凝土法兰均出现剪切破坏。试件载荷位移曲线大致可分为弹性变形、弹塑性变形、载荷下降和残余变形阶段。试件轴向压缩承载力和延性随ξ的增大而增大，轴向压缩承载力随着f _{cu 的}增大而逐渐增大。，而延展性降低。随着t _{2 的}增加，延性显着提高，而轴向压缩承载能力略有增加。轴向压缩承载能力随着λ _s的增加而逐渐降低，而延性增加。通过引入修正函数( )建立了STHCC短柱轴压承载力的解析表达式，与实验结果吻合较好。最后提出了几条设计准则，为这种新型组合柱在实际工程中的推广应用提供了基础。