Abstract Connections of I-beam to CHS column in buildings are either simple (fin plate connection, directly welded beam connections) and flexible or rather complex and rigid (external diaphragm connections). The passing-through I-beam-to-CHS column connections made by laser cutting technology offer a solution that limit the amount of welding and enhance the stiffness of the joint. An experimental campaign has been carried out to investigate the behaviour of this type of moment resisting connections under monotonic equal bending moment produced by gravity loadings. These experimental tests demonstrate that the uninterrupted continuity of the I-beam produces rigid-full strength connections. In addition, the same configuration has been tested under opposite bending moments applied either monotonically or in a cyclic manner to characterize the connection behaviour under seismic loading. The failure modes are quite different compared to those observed under equal bending moment and involve substantial force redistributions between the different joint components after cracks propagation has occurred. These tests highlighted the impact of the tube-wall thickness and the welding technique on the connection response. An analytical model is proposed to evaluate the bending resistance and the initial rotational stiffness considering the interaction between the tube and the segment of the beam section inside the tube. This beam is assumed to rest on two supports and restrained at the support by the tube. The design model predictions are in good agreement with experimental tests and numerical simulations.

中文翻译：

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激光切割技术制作的直通工字钢-CHS柱节点：实验测试和设计模型

摘要 建筑物中工字梁与CHS柱的连接要么简单（翅片连接，直接焊接梁连接），要么比较复杂和刚性（外隔板连接）。由激光切割技术制成的贯穿工字梁到 CHS 柱的连接提供了一种解决方案，可以限制焊接量并提高接头的刚度。已经进行了一项实验活动，以研究这种类型的抗弯连接在重力载荷产生的单调等弯矩下的行为。这些实验测试表明，工字梁的不间断连续性产生刚性全强度连接。此外，在以单调或循环方式施加的相反弯矩下测试了相同的配置，以表征地震载荷下的连接行为。与在相同弯矩下观察到的失效模式相比，失效模式有很大不同，并且在裂纹扩展发生后，不同接头组件之间的力重新分布很大。这些测试突出了管壁厚度和焊接技术对连接响应的影响。提出了一个分析模型来评估考虑管子和管子内部梁段之间的相互作用的抗弯性和初始旋转刚度。假定该梁靠在两个支撑件上，并被管子约束在支撑件上。