摘要
为优化基于形状记忆金属(Shape memory alloy,简称SMA)耗能梁的自复位K型偏心支撑钢框架结构的复位效果。采用ANSYS软件建立了梁、实体混合单元模型,在验证有限元模型合理的基础上,进行偏心支撑结构滞回性能分析。通过改变支撑与梁(上端)、支撑与基础(下端)的连接类型,设计了4个自复位K型偏心支撑钢框架结构,考察支撑类型对自复位K型偏心支撑钢框架结构滞回性能、塑性机制、骨架曲线、滞回耗能及复位效果的影响。研究表明:支撑上端刚接、下端铰接易形成理想塑性复位机制,该机制下结构复位效果最佳,但结构初始刚度、水平承载力、耗能能力会有所下降。
In order to optimize the self-centering effect of K-shape eccentrically braced steel frame with shape memory alloy(SMA)link beam,finite element model(FEM)with beam and solid mixture element types is carried out using ANSYS software.After the rationality of the finite element model is verified,the hysteretic behavior of the eccentrically braced structure is analyzed.A total of four K-shape eccentrically braced steel frames are designed trough changing the type of connection between the brace and the beam(the upper end),the brace and the base(the lower end).The influence of the connection type on hysteretic behavior,plastic mechanism,skeleton curve,hysteretic energy dissipation and self-centering effect of self-centering K-shape eccentrically braced steel frame are investigated.The results show that the self-centering K-shape eccentrically braced steel frames with rigid connection in the upper end of the brace and hinged in the lower end have perfect plastic self-centering mechanism.With the mechanism,the structure has perfect self-centering behavior,but the initial lateral stiffness,horizontal bearing capacity and energy dissipation capacity are declined.
作者
刘文渊
陈力
孙国华
冷捷
Liu Wen-yuan;Chen Li;Sun Guo-hua;Leng Jie(Taizhou Institute of Science and Technology,Nanjing University of Science and Technology,Taizhou 225300,China;Sate Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University,Nanjing 210007,China;Jiangsu Key Laboratory of Structure Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)
出处
《工程抗震与加固改造》
北大核心
2019年第5期7-13,共7页
Earthquake Resistant Engineering and Retrofitting
基金
国家重点研发计划(2016YFC0305200)
国家自然科学基金(51578355)
江苏省自然科学基金(BK20161369)
江苏高校“青蓝工程”(2017)
江苏省高校自然科学研究项目(15KJB560008)
关键词
形状记忆金属
偏心支撑
自复位
残余变形
滞回性能
shape memory alloy(SMA)
eccentrically brace
self-centering
residual displacement
hysteretic behavior
