Abstract Column-tree connections are commonly used for steel moment frame buildings in East Asian countries because they can reduce labor and construction time. However, a column-tree connection has an inherent issue of splice slip between the stub beams and the mid-portion of the beam. In this study, analytical modeling to account for slip behavior of the column-tree connection is proposed and examined by comparing sub-assemblage test results and then applied to a nonlinear dynamic analysis of steel intermediate moment frame (SIMF) buildings. In the nonlinear dynamic analyses, two example buildings that use welded unreinforced flange-welded web connections and column-tree type connections, respectively, were designed, and their responses were compared. Comparison of the analysis results to sub-assemblage test results indicate that a macro model based on the lumped plasticity assumption can adequately simulate the behavior observed in test results. The distribution of plastic deformations among the beam, column, and beam-to-column joint was similar to those of the test results. The nonlinear dynamic analyses indicated that column-tree connections with a splice slip have positive effects on frames with a weak panel zone. The splice slip increased the rotational capacity of the assembly and reduced the inelastic demand of the panel zone because early slips occur at the beam splice before the weak panel zone yields. Column-tree construction is therefore a viable method for constructing SIMF buildings in areas of low-to-medium seismicity.

中文翻译：

---

柱-树连接钢框架的抗震分析

摘要 柱-树连接在东亚国家被普遍用于钢框架建筑，因为它们可以减少劳动力和施工时间。然而，柱-树连接在短梁和梁的中间部分之间存在拼接滑动的固有问题。在这项研究中，通过比较子装配测试结果提出并检验了考虑柱-树连接滑移行为的分析模型，然后将其应用于钢结构中间力矩框架 (SIMF) 建筑的非线性动力分析。在非线性动力分析中，设计了两个分别使用焊接无筋法兰焊接腹板连接和柱树型连接的示例建筑物，并比较了它们的响应。分析结果与子装配试验结果的比较表明，基于集中塑性假设的宏观模型可以充分模拟试验结果中观察到的行为。梁、柱和梁柱节点的塑性变形分布与试验结果相似。非线性动力分析表明，具有拼接滑动的柱-树连接对具有弱面板区的框架具有积极影响。拼接滑动增加了组件的旋转能力并降低了面板区域的非弹性需求，因为在弱面板区域屈服之前，梁拼接处会发生早期滑动。因此，柱树结构是在中低地震活动地区建造 SIMF 建筑物的可行方法。