高强钢芯筒-螺栓连接钢管柱节点静力性能试验

Experiment on the static behavior of steel tubular column joint assembled by high strength steel core tube-bolts

摘要:

为解决现有钢管柱节点单边螺栓锚固不足和操作复杂的问题,提出高强钢芯筒-螺栓连接副装配式节点,连接副由内置于钢管柱的高强钢芯筒和常规高强螺栓组成.为考察这种新型节点的静力性能,对6个1∶1足尺钢管柱框架边节点进行单调加载试验,研究变量为钢芯筒类型、筒壁厚度、螺栓直径、钢梁端板厚度.重点分析节点关键部位的应力变化、变形能力、破坏模式、螺栓拉力和节点类型.结果表明:试件均为半刚性节点、梁端塑性铰破坏机制,封闭型芯筒厚度与螺栓直径相当时可以满足梁柱刚接的强度条件；节点域变形很小可以忽略,芯筒转动变形对节点转动影响不超过10%；钢梁端板与柱的间隙随着芯筒厚度减小而快速增长,螺栓有拔出趋势,连接副的抗拉设计值可按钢板螺纹抗拉承载力的70%取用.

Abstract:

To solve the problems of steel tube column joints, such as insufficient anchorage strength and complex construction, steel tube column joints assembled by high strength steel core tube-bolt assemblies were proposed. The assemblies were composed of high strength steel core tubes embedded in steel tube columns and normal bolts. To study the static behavior of the new connections, six full scaled specimens of steel tubular column frame exterior joints were tested under monotonic loading. The research parameters included the types of the steel core tube, the thickness of the steel core tube plate, the bolt diameter, and the end-plate thickness. The stress distribution of the specimen key parts, the deformation capacity, the failure modes, the bolt tension stress, and the joint types were analyzed. Results show that the specimens were semi-rigid joints, and all joint failure modes belong to steel beam plastic hinge mechanisms. When the plate thickness of the enclosed type core tube was equal to the bolt diameter, the joint could satisfy the strength conditions of the rigid joint in the Chinese code. The deformation of the joint panel zone could be ignored, and the rotations of the core tubes were less than 10% of the total rotation. When the core tube plate thickness decreased, the width of the gap between the end-plate and the column would increase rapidly, and the bolt might be pulled out. The steel plate-bolt assembly tension force design value could be calculated as 70% of the tension bearing capacity of the threaded hole in high strength steel plates.