Concrete-filled U-shaped steel (CFUS) beam and concrete-filled steel tube (CFST) column are recently developed because of the quick construction and economical saving. This paper aims to investigate the seismic performance of a composite connection system connecting CFUS beam to square CFST columns. In the joint system, the grooved cuts on the square tube allowed the U-shaped steel beam passing through the joint core completely, which developed a through beam connection. To verify the seismic behavior of the beam-column connection, three specimens designed according to the strong column-weak beam and strong joint-weak member seismic concept were tested under combined constant axial compression and cyclic loading. For the test parameters, the different connection details and the axial load on the CFST column were considered. The test results showed that the specimens exhibited good load-carrying, deformation, and energy dissipation capacities. The maximum story drift ratio of all the three specimens was 5%, satisfying the minimum requirement of special moment frames. The primary failure mode of the specimens was local buckling of the webs and the fracture of the bottom flanges of the CFUS beam near the column tube. In addition, the joint shear strength of the specimens was evaluated based on ASCE design guidelines.

由于快速施工和节约成本，最近开发了U型钢管混凝土（CFUS）梁和钢管（CFST）立柱。本文旨在研究将CFUS梁连接到方形CFST柱的复合连接系统的抗震性能。在接头系统中，方管上的凹槽可让U形钢梁完全穿过接头芯，从而形成了通梁连接。为了验证梁柱连接的抗震性能，在恒定轴向压缩和循环荷载作用下，测试了根据强柱弱梁和强联合弱构件抗震概念设计的三个样本。对于测试参数，考虑了不同的连接细节和CFST柱上的轴向载荷。测试结果表明，试样具有良好的承载，变形和能量耗散能力。所有三个样本的最大故事漂移率为5％，满足特殊弯矩框架的最低要求。样品的主要破坏模式是腹板局部屈曲以及柱管附近CFUS梁底部凸缘的断裂。此外，根据ASCE设计指南评估了样品的联合剪切强度。样品的主要破坏模式是腹板局部屈曲以及柱管附近CFUS梁底部凸缘的断裂。此外，根据ASCE设计指南评估了样品的联合剪切强度。样品的主要破坏模式是腹板局部屈曲以及柱管附近CFUS梁底部凸缘的断裂。此外，根据ASCE设计指南评估了样品的联合剪切强度。