钢管结构加强型K型搭接节点的破坏准则及承载力分析  

Destruction criterion and bearing capacity analysis of reinforced unstiffened overlapped K-joint

作　　者：杨文伟[1] 马品军 林健康 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《兰州理工大学学报》2017年第6期133-138,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金资助项目(51468054)

摘　　要：利用ANSYS10.0对未加强K-CCYN、K-CCYH节点,加强的K-CCE、K-CCC节点分别建立有限元模型,分析隐藏焊缝对搭接节点静力性能的影响,及隐藏焊缝不焊接而通过垫板和混凝土两种加强方式对节点进行加强的可行性;对不同节点在静力荷载下的破坏模式及承载力情况作对比分析.结果表明:相对隐藏焊缝不焊接的未加强节点,隐藏焊缝焊接节点的承载力提高约16%,并改变了节点的破坏模式;主管管壁垫板加强和主管灌混凝土加强的节点承载力均有提高,分别提高约34%和约27%;垫板能改变节点的传力路径,有效避免节点处的应力集中,使其受力更均匀;垫板长度变化对承载力影响可以忽略,垫板厚度对节点承载力提高不足1%.采用垫板和混凝土对节点加强,加强节点受力显示出优越性.综合考虑各因素,垫板和混凝土两种加强方式优先选择垫板加强的方式.Finite element models of nonreinforced nodes K-CCYN and K-CCYH and reinforced nodes KCCE and K-CCC were established respectively with ANSYS10.0,the influence of hidden weld on the static performance of the node was analyzed,the feasibility of node reinforce with backing plates or concrete at hidden weld spot without welding was also analyzed;the bearing capacity and destruction mode of different nodes were compared and analyzed under static load.The result shows that the bearing capacity of hidden weld at the joints will increase by about 16%as compared with that of nonreinforced node without welding at hidden weld spot,and the destruction mode of the node will be changed.The bearing capacity of the node reinforced with wall backing plates on chord pipe and with concrete reinforcement will all be improved by about 34% and 27%,respectively.The backing plate can change the force transmission path at the node and the stress concentration will be avoided effectively thereat,making its stress more uniform.The influence of backing plate length on bearing capacity of node can be neglected,and the contribution of backing plate thickness to node bearing capacity will be less than 1%.The backing plates and concrete reinforced node will show the superiority of the stress on it.Taking various factors into comprehensive consideration,the choice priority of node reinforcement should be given to backing plates instead of concrete pouring.

关 键 词：钢管结构 隐藏焊缝 K型加强型搭接节点 极限承载力 

分 类 号：TU321.1[建筑科学—结构工程] TU391