N型圆钢管相贯节点滞回性能的试验研究  

Experimental research on hysteretic behavior of unstiffened tubular N-joints

作　　者：李自林[1] 朱斌[1] 吴亮秦[1] 韩庆华[2] 

机构地区：[1]天津城市建设学院土木工程系,天津300384 [2]天津大学建筑工程学院,天津300072

出　　处：《建筑结构学报》2008年第6期69-74,共6页Journal of Building Structures

基　　金：天津市自然科学基金资助重点项目(08JCZDJC18300);国家自然科学基金资助项目(50608054)

摘　　要：设计了专用的加载装置,对4种不同形式的N型圆钢管相贯节点进行了往复加载的试验研究,得到了节点的滞回曲线。观察节点的破坏现象,得出往复荷载作用下相贯节点在不同加强形式下破坏特征一致的结论。分析比较各节点的延性、耗能能力和强度等力学性能,揭示了垫板加强和弦杆内填混凝土等加强措施在一定程度上降低了节点的滞回性能和延性,但有效提高了节点的极限承载力。得到了各节点的承载效率、节点延性系数,并对其进行量化比较和评价,发现弦杆内填混凝土N型加强节点承载效率最高,其延性系数也较大;N型直接焊接节点承载效率最低,其延性系数最大。这些结论对于N型圆钢管相贯节点的优化设计具有一定的参考价值。This paper designs a special loading device to perform experimental research under cyclic load on four different forms of unstiffened tubular N-joints, and obtains the hysteretic curves of joints. Observation of tested joints revealed that under cyclic load, the failure characteristic of unstiffened tubular N-joints with different reinforced forms is identical. Analyzing the relationships of N-joints between ductility, energy dissipation capability and strength show that reinforcing measures such as reinforced with doublet plate and in-filled concrete reduce the hysteretic behavior and ductility to certain degrees, but enhance the ultimate strength effectively. It is found that N-joint reinforced with in-filled concrete has highest loading capacity ratio and large ductility. The N-joint with direct welding, has the lowest loading capacity ratio but the largest ductility. These conclusions are valuable for unstiffened tubular N-joints＇ optimization design.

关 键 词：相贯节点 加载装置 试验研究 滞回性能 破坏特征 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1