节点域箱形加强式工字形柱弱轴连接梁端加强与削弱并用节点滞回性能有限元分析

Finite Element Analysis on the Hysteretic Behavior of Box Strengthen-Joint Region Connection between Minor-Axis I-Shaped Column and Strengthen-Weaken Beam

提出了一种新型的节点域箱形加强式工字形柱弱轴连接的梁端加强与削弱并用的节点形式,对应用该新型节点形式的工字形柱钢框架和箱形柱采用梁端加强与削弱并用节点的钢框架的整体力学性能、经济性进行对比分析,以及在循环荷载作用下两种节点的力学性能、转动能力、延性等进行对比分析。分析结果表明,对于8度抗震区的6层钢框架,采用节点域箱形加强式工字形柱弱轴连接的钢框架在整体力学性能和经济性方面完全优于箱形柱钢框架;在循环荷载作用下,节点域箱形加强式工字形柱弱轴连接的滞回性能、承载力等均与箱形柱连接相当,塑性转角均大于0.03rad,延性系数都大于4.0,均满足规范要求,能完全实现"强节点弱构件"和"强柱弱梁"的设计理念,并具有强节点域的特点。

A new box strengthen-joint region connection is presented for minor-axis I-shaped column and strengthen-weaken beam.This new connection pattern for I-shaped column in steel frame is applied to make a comparison with traditional box-shaped column with strengthen-weaken beam-column connection on overall mechanical performance,cost,and behavior under cyclic loading.The results show that in 8-degree earthquake zone,overall mechanical properties and cost of box strengthen-joint connection is better than those of box-shaped column connection.Under cyclic loading,the hysteretic behavior and bearing capacity of box strengthen-joint connection is similar to those of box-shaped column connection.Moreover,plastic rotation of box strengthen-joint connection is more than 0.03 rad,and ductility coefficient is more than 4.0.They both satisfy current standard requirements.The design concepts of＂strong joint and weak member＂and＂strong column and weak beam＂are realized,and panel zone is also strengthened.