摘要
结合实际工程探讨了采用屈曲约束支撑作为高层框架核心筒结构加强层伸臂桁架的可行性及优越性,对比分析了普通支撑与屈曲约束支撑加强层方案结构整体动力性能、层间位移角,以及大震下弹塑性基底剪力等。计算结果表明,在满足正常使用状态的情况下屈曲约束支撑可以选择相对较小的截面,在加强层采用屈曲约束支撑作为伸臂桁架能够有效降低结构刚度突变,通过屈服耗能以降低大震下的反应,减小地震作用对整体结构重要构件的破坏,屈曲约束支撑实现提高刚度、承载力同时减小刚度突变的和谐统一。
Feasibility and superiority of buckling restrained brace ( BRB) used as outrigger in high-rise building with frame-core tube are discussed,based on an actual project in Shenzhen. Ordinary brace case,in which it is used as web members of strengthened story truss,and BRB case are compared,including dynamic characteristic of the entire structure,inter-story drift when subject to frequent earthquakes,and base shear force under rare earthquakes. Results show that the sections of BRBs are smaller than those of ordinary braces under normal service state. It is useful for BRB to enhance stiffness and alleviate abrupt change of story stiffness. BRB will yield and dissipate cumulative hysteretic energy under rare earthquakes,it also helps to reduce earthquake action of the entire building and protect other important members from being damaged. BRB strengthened story is able to enhance stiffness and shear capacity while eliminates sudden stiffness change at the same time.
出处
《建筑钢结构进展》
北大核心
2013年第4期41-46,共6页
Progress in Steel Building Structures
关键词
屈曲约束支撑
加强层
伸臂桁架
层间位移
基底剪力
buckling restrained brace
strengthened story
outrigger
inter-story drift
base shear force
