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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 type of node for strengthening and weakening the beam end of box-shaped reinforced box-shaped I-beam with weak shaft connection was proposed. For the new type of I-column steel frame and box column, Weakened and compared with the overall mechanical properties and economy of the steel frame of the node, and comparative analysis of the mechanical properties, rotational ability, ductility of the two kinds of joints under cyclic loading. The analysis results show that for the 6-story steel frame with 8-degree seismic area, the steel frame connected by the box-shaped strengthened I-beam and the weak shaft in the node field is better than the box-shaped steel frame in overall mechanical properties and economy. Under the action of load, the hysteretic behavior and the bearing capacity of the box-shaped strengthened I-beam in the node domain are all connected with the box-shaped columns with the plastic angles greater than 0.03rad and the ductility coefficients greater than 4.0, all meeting the specifications. Can fully realize the design concept of “strong node weak component” and “strong column weak beam”, and has the characteristics of strong node domain.