穿心板式钢管混凝土柱-钢梁栓焊连接节点力学性能分析

ANALYSIS ON MECHANICAL PROPERTIES OF THROUGH DIAPHRAGM BOLTED-WELDED JOINTS BETWEEN CFST COLUMN AND STEEL BEAM

该文提出两种适用于窄截面钢管混凝土柱的穿心板式栓焊节点,两种节点的下翼缘和腹板采用螺栓连接,上翼缘采用焊接连接。该节点既能有效避免室内凸角的出现,又能解决全螺栓连接节点需要预留安装缝、节点刚度偏低的问题,同时具有可快速装配、方便混凝土浇筑等优点。该文阐述了节点的构造、加工及装配过程、设计原理;基于单调加载试验建立有限元模型,分析了该节点的受力过程、破坏模式、刚度和延性。结果表明:有限元模型分析结果与试验吻合较好;穿心板式栓焊连接节点的主要破坏模式为梁受压翼缘的屈曲及相邻腹板的鼓曲,节点塑性铰远离节点核心区,符合强节点弱构件的设计原理;节点属于刚性连接,具有较大的刚度和承载力、较好的延性。

Proposes two types of through diaphragm bolted-welded joints(TDBWJs)between narrow concretefilled steel tube(CFST)column to steel beam.The bolted connection is used in bottom flange and web of the beam,and the welded connection is adopted in the upper flange of the beam.The joints can not only effectively avoid the appearance of exposed corners indoor,but also solve the problems of reserved installation gaps and smaller joint stiffness of full bolted joints.The joints also facilitate assembly and concrete pouring.The structural details,assembly process,design principle of joints were presented.In order to investigate the loading process,failure mode,stiffness and ductility of the joints,monotonic loading tests were carried on the joints,and the finite analysis was conducted based on the tests.The results show good agreement between the tests and finite element analysis.The main failure modes of the joints are the buckling of the flange in compression and the bulge of the adjacent web,with the plastic hinges of the joints far away from the panel zone,which conforms to the design principle of strong joint and weak member.The joints can be classified as rigid connections,which have large stiffness and bearing capacity,as well as preferable ductility.