Abstract An evaluation of the seismic demands on column splices in special concentrically braced frames (SCBFs) at different system response levels is presented. Because of the critical nature of column splices and the absence of inclusive research that quantify seismically induced demands with respect to design requirements, this paper aims to investigate the level of splice demands in ductile CBFs. The study assesses the nonlinear dynamic response of 5- and 13-story SCBFs with the common two-story X-bracing configuration under an ensemble of earthquake ground motion records. The study concludes that when the likelihood of brace fracture is high, the required design strength for column splices under tensile and shear force demands yield a high margin of safety. On the other hand, as the likelihood of brace fracture increases, the flexural and the combined axial force and flexural demands become significant. Column splices seem to withstand flexural demands larger than the required by the current design code. Furthermore, column splices under the combined axial and flexural demands appear to attain the capacity of the smaller column, particularly when brace fracture becomes inevitable

中文翻译：

---

考虑支撑断裂的同心支撑框架柱接头抗震要求

摘要 对不同系统响应水平下特殊同心支撑框架(SCBFs) 柱接头的抗震要求进行了评估。由于柱接头的关键性质，并且缺乏对设计要求方面的地震诱发要求进行量化的综合研究，本文旨在研究延性 CBF 的接头要求水平。该研究评估了具有常见两层 X 支撑配置的 5 层和 13 层 SCBF 在地震地面运动记录集合下的非线性动力响应。研究得出的结论是，当支架断裂的可能性很高时，在拉伸和剪切力下柱接头所需的设计强度要求产生高安全裕度。另一方面，随着支具断裂的可能性增加，弯曲和组合轴向力和弯曲要求变得重要。柱接头似乎能够承受比当前设计规范要求更大的弯曲要求。此外，在轴向和弯曲要求组合下的柱接头似乎可以达到较小柱的承载力，特别是当支撑断裂变得不可避免时