This paper proposes a new kind of irregular-shaped concrete-filled steel tube columns to H-shaped steel beam joints with inner semi-diaphragm (ICFSTC-Joint). The inner semi-diaphragms are welded with the inner surface of the column wall, directly opposite to the flange of the H-shaped steel beam, ensuring tensile force from the beam flange to go directly into the semi-diaphragm. Firstly, the experiments of two L-shaped and two T-shaped ICFSTC-Joint (L-Joint and T-Joint) specimens under different axial compressive ratios are carried out to investigate their hysteretic behavior and failure mode. The experimental results show that the proposed ICFSTC-Joint could effectively improve the hysteretic performance, bearing capacity and stiffness of CFST column joints and can realize that the beam yields before the joints fail. It is obsereved that the axial compressive ratio of the column, as a key parameter, influences the hysteretic behavior of ICFSTC-Joint significantly. Secondly, the FE models of L-Joint and T-Joint are established and verified by the experimental results. The hysteretic curves and skeleton curves of ICFSTC-Joint FE models are obtained and agree well with the experimental curves. Finally, a parameter analysis is carried out by using established FE model to investigate the influence of inner semi-diaphragm on the hysteretic behavior of ICFSTC-Joint, involving the height and thickness of inner semi-diaphragm. A recommended value of the size of diaphragm is given for engineering design. This paper provides reference for engineering design of irregular-shaped CFST column-beam joints and further study on their design method.

本文提出一种新型异形钢管混凝土柱与H型钢梁节点带内半隔膜（ICFSTC 接头）。内半隔板与柱壁内表面焊接，与H型钢梁翼缘正对，保证梁翼缘的拉力直接进入半隔板。首先，对两个L形和两个T形ICFSTC-Joint（L-Joint和T-Joint）试件进行了不同轴向压缩比下的实验，以研究其滞回行为和失效模式。实验结果表明，所提出的 ICFSTC-Joint 可有效提高钢管混凝土柱节点的滞回性能、承载力和刚度，并可实现梁在节点失效前屈服。据观察，作为关键参数的柱轴压比，显着影响 ICFSTC-Joint 的滞后行为。其次，建立了L型接头和T型接头的有限元模型，并通过实验结果进行了验证。得到了ICFSTC-Joint FE模型的滞回曲线和骨架曲线，与实验曲线吻合良好。最后，利用已建立的有限元模型进行参数分析，研究内半隔膜对ICFSTC-Joint滞回行为的影响，涉及内半隔膜的高度和厚度。为工程设计给出了膜片尺寸的推荐值。为不规则形状钢管混凝土柱梁节点的工程设计及其设计方法的进一步研究提供参考。