摘要
传统的结构设计中,防屈曲支撑和钢框架采用焊接节点板进行连接,然而焊接节点板处焊缝在往复地震作用下易发生脆断,迫使防屈曲支撑提前退出工作,影响结构的安全可靠。为此,将延性连接件引入防屈曲支撑的设计构造中,采用Abaqus有限元分析软件探究了不同设计参数对结构在单向荷载作用下的延性、承载能力、耗能性能、应力分布及刚度退化等抗震性能的影响规律,并依据其中一榀有限元模型进行了试验验证。研究结果表明,延性连接件的引入可明显缓解梁柱节点域的应力集中,部分节点域应力在设计弹塑性层间位移角下仍维持在弹性范围内。延性连接件成功实现将结构的塑性变形集中在耗能段部位的目标,并形成耗能段可先进行屈服耗能,防屈曲支撑后续进行补充屈服耗能的两阶段耗能机制,为防屈曲支撑连接节点的设计提供参考。
In the traditional structural design,the welded gusset plate is used to connect the buckling restrained brace and the steel frame.However,the weld at the welded gusset plate is prone to brittle fracture under the action of reciprocating earthquake,which forces the buckling restrained brace to withdraw from the work ahead of time and affects the safety and reliability of the structure.In this paper,the ductile connectors are introduced into the design of buckling restrained braces,and the influence of different design parameters on the ductility,bearing capacity,energy dissipation,stress distribution and stiffness degradation of the structure under one-way load is studied by using ABAQUS finite element analysis software.The results show that the introduction of ductile connectors can significantly alleviate the stress concentration in the beam column joint area,and the stress in some joint areas remains in the elastic range under the designed elastic-plastic interlayer displacement angle.The ductile connection successfully achieves the goal of concentrating the plastic deformation of the structure on the energy dissipation section,and forms a two-stage energy dissipation mechanism that the energy dissipation section can be subjected to yield energy dissipation first,and the buckling restrained brace can be supplemented with yield energy dissipation later,which provides a reference for the design of the connection joints of the buckling restrained brace.
作者
殷占忠
孙宝悦
安树桢
冯大哲
Yin Zhanzhong;Sun Baoyue;An Shuzhen;Feng Dazhe(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《建筑科学》
CSCD
北大核心
2021年第11期22-30,共9页
Building Science
基金
国家自然科学基金项目(51568040)
甘肃省减震隔震国际科技合作基地培育项目资助(TM-TK-0906)。
关键词
延性连接件
防屈曲支撑
钢框架
力学性能
应力分析
ductile connector
buckling-restrained brace
steel frame
mechanical property
stress analysis
