A flat concrete-filled steel tubular column (FCFST) is a concrete-filled steel tubular column (CFST) with a section length-width ratio greater than or equal to two. In this study, the vertical stiffener joint was appropriately modified, and a new type of rigid joint suitable for the width-side direction (weak axis direction) of the FCFST and H-beam was proposed. Four specimens were designed for pseudo-static experiments, and Abaqus was used to establish finite element models (FEM) to provide a supplementary calculation. The results showed that the π-shaped joints had a clear load path, sufficient energy consumption, and good seismic performance. When the beams were eccentrically arranged, the stiffness and ultimate strength of the joints were improved, whereas the ductility was reduced. Subsequently, a parameterized analysis was performed for the π-shaped joint of the FCFST. It was determined that the thickness of the π-shaped part, length of the corbel, thickness of the steel tube, and width of the FCFST have prominent influences on the stiffness and ultimate strength of the joint. Finally, a calculation formula was derived for the joint based on the yield-line theory. The calculation results of the formula were compared with the experimental results. These errors were found to be acceptable, confirming that this approach can be used in actual projects.

扁平钢管混凝土柱（FCFST）是截面长宽比大于或等于2的钢管混凝土柱（CFST）。本研究对竖向加强筋节点进行了适当修改，提出了一种适用于FCFST和H型梁宽度侧方向（弱轴方向）的新型刚性节点。设计了4个试件进行拟静力实验，利用Abaqus建立有限元模型（FEM）进行补充计算。结果表明，π形节点具有清晰的载荷路径、足够的能耗和良好的抗震性能。当梁偏心布置时，节点的刚度和极限强度提高，而延性降低。随后，对 FCFST 的 π 形接头进行了参数化分析。确定π形部分的厚度、牛腿的长度、钢管的厚度和FCFST的宽度对接头的刚度和极限强度有显着影响。最后，基于屈服线理论推导出接头的计​​算公式。将公式计算结果与实验结果进行了比较。发现这些错误是可以接受的，证实了这种方法可以用于实际项目。根据屈服线理论推导出接头的计​​算公式。将公式计算结果与实验结果进行了比较。发现这些错误是可以接受的，证实了这种方法可以用于实际项目。根据屈服线理论推导出接头的计​​算公式。将公式计算结果与实验结果进行了比较。发现这些错误是可以接受的，证实了这种方法可以用于实际项目。