K形偏心支撑钢框架的支撑节点优化设计

Optimal design of bracing nodes in K-eccentrically braced steel frames

以往对于偏心支撑钢框架结构体系的研究着重于其耗能性能,而对于支撑节点的设计研究甚少。文章在现有不合理支撑节点研究基础上对K形偏心支撑钢框架的支撑节点进行了不同的设计,通过有限元分析及构造等要求得出最优和3种支撑节点应力较小的支撑形式,对4种模型在不同水平荷载作用下进行了对比分析,从而得出对于偏心支撑钢框架结构体系,合理的支撑节点设计可以明显减小节点应力以避免或延缓其屈曲,为偏心支撑钢框架结构体系的应用提供一定的参考。

So far,many researchers have focused on the energy dissipation capacity of eccentrically braced steel frames,but little research has been done on the bracing nodes.This paper designed the different bracing nodes in the K-eccentrically braced steel frame which was based on the study of unreasonable bracing nodes,and found the best bracing nodes and three bracing nodes of lower stress by performing nonlinear finite element analysis for all test models of eccentrically braced frame and considering construction requirements.The finite element analyses of four models under the action of horizontal loading were conducted.The results show that the reasonable design of bracing nodes in eccentrically braced steel frames can obviously reduce their stress,avoid or delay their yield,which provides a reference for the research and application of eccentrically braced steel frames.