新型钢框架梁柱节点滞回性能试验研究及有限元分析  

Experimental Investigation and Finite Element Analysis on the Hysteretic Behavior of New Steel Beam-to-Column Connections

作　　者：何小辉[1] 武振宇[1] 张扬[2] 成博[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]中国建筑设计研究院,北京100044

出　　处：《土木建筑与环境工程》2011年第6期70-78,共9页Journal of Civil,Architectural & Environment Engineering

基　　金：国家科技支撑计划(2006BAJ01B02-01-04)

摘　　要：通过模型节点滞回试验研究和有限元分析,探讨了一种新型钢框架梁柱耗能节点的力学性能和耗能能力。该节点是利用螺杆对角钢节点进行改善的半刚性节点,并基于控制结构损伤仅限于角钢和螺杆进行设计。6个模型节点的对比实验研究表明,试验节点因角钢塑性损伤、裂缝扩展和螺杆屈曲及疲劳断裂而出现性能退化。螺杆连接的节点转动能力和破坏模式取决于螺杆的抗疲劳断裂能力,采用良好延性螺杆的节点具有更好的耗能能力。节点有限元模型可以较好地模拟试验节点在出现明显强度退化或螺杆断裂前的滞回性能和变形模式,验证了角钢垂直度偏差引起的预应力刚化效应、角钢塑性区分布和螺杆屈曲引起的节点性能退化。最后,分析了这种新型梁柱耗能节点的优缺点,并提出了进一步改进节点和深入研究的建议。By the hysteretic experiments and the finite element analysis of the proof-of-concept connections,the mechanical properties and energy dissipation capacity of the new steel beam-to-column connections are investigated.These connections are semi-rigid ones improved by adding threaded rods into the angle connections and can be designed to limit the structural damage only to the angles and threaded rods.It is found,by the comparative analysis of six connections tested with the same loading sequence,that the performance degradation of the connections may be resulted from the plastic damage,crack propagation of the angles and the buckling and fatigue crack of the rods.The rotation capacity and failure modes of the connections with threaded rods depend on the ability of anti-fatigue crack of the rods,and the better ductility the rods have,the better energy dissipation capacity the connections have.In addition,the hysteretic behavior and the deformation modes of the connections prior to the significant strength degradation or the fracture of the rods could be well simulated by the finite element method.Meanwhile,the stiffening effect from pre-stressing the angles,the plastic distribution of the angles and the degradation induced by the rod buckling were strongly verified by the FEA.Finally,the advantages and disadvantages of such new beam-to-column dissipative connections were analyzed,and the proposal for further connection improvement and in-depth study was made.

关 键 词：新型梁柱节点 角钢 螺杆 滞回性能 试验 有限元分析 

分 类 号：TU391[建筑科学—结构工程]