摘要
屈曲约束支撑(Buckling Restrained Brace,简称BRB)作为具有良好耗能能力的新型支撑被广泛使用。与此同时,金属阻尼器发展迅速,也为结构抗震设计提供了新思路。将金属阻尼器与传统支撑(文中采用方钢管)结合设计出新型TTD(Tube-in-Tube Damper)支撑,其屈服承载力由阻尼器承载力决定,刚度由方钢管与阻尼器共同决定。改变长度与屈服承载力,设计对应的BRB与TTD支撑,对比两者用钢量,发现刚度与屈服承载力相当的TTD支撑相比BRB可节省用钢量,在承载力较小与支撑长度较大情况中尤其明显,这为地震作用下支撑设计提供了新的思路。
Buckling restrained brace（BRB）is widely used as a new bracing with good energy dissipation capacity.Also,the rapid development of metal damper provides a new idea for seismic structural design.The new tube-in-tube damper（TTD）brace is designed by combining metal damper with traditional bracing.The bearing capacity of this device is determined by the damper,while the stiffness is determined by the square tube bracing and damper together.In this paper,the bracing length and yielding strength are varied,and the corresponding BRB and TTD bracing are designed.The total steel consumptions in both bracing structures are compared.It is found that TTD braces can save some steel when both bracings have the same stiffness and yielding strength,especially when the bracing is long or the yielding strength is relatively low.A new method is provided for the design of braces under earthquake.
出处
《建筑钢结构进展》
CSCD
北大核心
2017年第4期93-97,共5页
Progress in Steel Building Structures
基金
"十三五"国家重点研发计划(2016YFC0701203)
关键词
用钢量
屈曲约束支撑
TTD支撑
屈服强度
轴向刚度
steel consumption
buckling-restrained brace
TTD brace
yield strength
axial stiffness
