摘要
设计制作4个工字形截面非屈服段的新型防屈曲支撑试件,并进行滞回性能试验研究。非屈服段截面的变化能显著提高防屈曲支撑外伸段的抗弯抵抗矩,可有效避免由于刚度突变而发生屈曲失稳。试验过程中防屈曲支撑没有发生屈曲。在往复荷载作用下,防屈曲支撑没有出现强度和刚度的退化,表现出较好的延性和耗能能力。防屈曲支撑的恢复力模型为对称的双线性模型。依据防屈曲支撑的破坏特性提出在新型防屈曲支撑内核单元一字形与工字形截面的变截面处使用圆弧过渡的设计建议。
Four BRBs with I cross-section non-yielding segment are designed to study their hysteretic behavior. The transformation of the non-yielding segment's section can significantly improve the moment-resistance capacity of the unrestrained segment, avoiding buckling instability effectively due to sudden enhancement of stiffness. In the process of experiment, BRBs did not buckle. BRB specimens can undergo fully-reversed axial yield cycles without loss of stiffness and strength, the ductility the energy absorption of BRBs capacity are good. The resilience model can be simplified to a symmetrical bilinear resilience model. Due to failure behavior of BRB specimens, a suggestion for design improvement that using circular transition at the junction between rectangle section segment and I cross-section unrestrained segment is proposed.
出处
《土木工程学报》
EI
CSCD
北大核心
2014年第S2期69-73,共5页
China Civil Engineering Journal
基金
国家自然科学基金(91315301
51378162
51178150)
科技部"十二五"国家科技支撑计划项目(2013BAJ08B01)
教育部高等学校博士学科点专项科研基金(20112302110005)
土木工程防灾国家重点实验室开放课题基金(SLDRCE12MB-04)
教育部留学回国人员科研启动基金(2014)
黑龙江省博士后科研启动金(LBH-Q11123)
哈尔滨市科技创新人才基金(2013RFQXJ122)
关键词
防屈曲支撑
工字形截面非屈服段
延性
耗能
恢复力模型
buckling-restrained braces
H cross-section non-yielding segments
ductility
energy dissipation capacity
resilience model
