The seismic performance of T-shaped CFST column to H-shaped steel beam joint with vertical rib stiffeners was investigated experimentally and numerically in this study. Specifically, the joint shear deformation, inter-story drift ratio, joint stiffness, and energy dissipation capacity were analyzed. The test results demonstrate that the joint with vertical stiffeners has good seismic behavior and meets the requirements of Eurocode 3 for rigid joints in a braced frame. A finite element model for the multi-cell T-shaped CFST column to H-shaped steel beam joint with vertical rib stiffeners was established to investigate the influences of the following parameters on joint strength and joint stiffness: the width-to-thickness ratio of steel tube, vertical rib dimensions, and the axial load ratio of column. The numerical results indicate that the width-to-thickness ratio of steel tube and vertical rib dimensions play an important role in improving the joint strength and stiffness. A mechanical model for the joint strength was also developed, in which the contributions from the front face and side faces of steel tube and the vertical rib stiffeners were considered. To facilitate the practical design, a simplified design method for joint strength as well as the design suggestions for detailing are proposed based on the mechanical model.

本研究通过试验和数值方法研究了 T 形 CFST 柱与带有竖向肋加劲肋的 H 形钢梁节点的抗震性能。具体地，分析了节点剪切变形、层间漂移比、节点刚度和能量耗散能力。试验结果表明，带有垂直加劲肋的接头具有良好的抗震性能，符合欧洲规范 3 对支撑框架中刚性接头的要求。建立了带竖向肋加劲肋的多单元T形CFST柱-H形钢梁节点有限元模型，研究以下参数对节点强度和节点刚度的影响：钢管、竖肋尺寸、柱轴荷载比。数值结果表明，钢管宽厚比和竖肋尺寸对提高接头强度和刚度有重要作用。还开发了接头强度的力学模型，其中考虑了钢管正面和侧面以及垂直肋加劲肋的贡献。为便于实际设计，基于力学模型提出了一种简化的接头强度设计方法和细部设计建议。