箱形节点域H形柱弱轴削弱型连接的设计方法

DESIGN METHOD OF WEAK AXIS RBS CONNECTION OF H-SECTION COLUMN WITH BOX-SHAPED PANEL ZONE

为了实现"高延性-高弹性承载力"的抗震设计思路和推广削弱型RBS(Reduced Beam Section)连接在H形柱钢框架中的应用,提出了一种适用于H形柱弱轴的箱形节点域RBS连接的设计方法和步骤。通过一个多层钢框架工程的设计,验证了所提RBS型连接设计方法的可靠性。采用ABAQUS有限元软件对该工程的内框架十字形节点在循环荷载作用下的力学性能进行分析,研究了节点的破坏形态、滞回曲线、骨架曲线、延性系数。研究结果表明,新型箱形节点域H形柱弱轴RBS连接的设计方法合理、可靠,应用该方法设计的H形柱弱轴连接节点能够实现梁"塑性铰"的外移,节点具有较高的延性和承载能力,能够满足抗震规范中"强柱弱梁"和"强节点弱构件"的抗震设计要求。

In order to realize the seismic design idea of ＂high ductility and high bearing capacity＂and to promote the application of the RBS connection in the H-section column steel frame,the paper proposed the design recommendations about the box strengthen-joint region RBS connection of H-section column for the weak axis. The reliability of the design method was verified by a multi-storey steel frame engineering example. The mechanical properties of an internal frame joint under cyclic loading in the engineering example was analyzed by using the ABAQUS finite element software. The failure mode,hysteresis curve,skeleton curve,and ductility were analyzed. The analysis results showed that the design method of the new box strengthen-joint region RBS connection was reasonable and reliable. The box strengthen-joint region RBS connection can effectively move the beam plastic hinge away from the joint zone. The joint with the new connection has high ductility and bearing capacity,which can achieve the seismic design requirements of ＂strong column and weak beam＂and＂strong joint and weak component＂in seismic code.