摘要
基于现行建筑抗震设计规范规定的计算方法,推导了铅消能器附加给具有双线性模型的可以简化为单自由度体系的结构有效阻尼比计算公式,研究了不同水准地震作用下有效阻尼比的变化规律,结果表明:有效阻尼比随结构变形的增加而变化,在结构屈服前有效阻尼比先增后减,在结构屈服后,其弹性势能降低,合理设计的铅消能器附加给结构的有效阻尼比随变形增加而增大。该文对铅消能器的设计原则进行了讨论,并给出了抗震设计中铅消能器附加给结构的有效阻尼比的取值方法。
Based on the current seismic design specification, the additional damping ratio formula has been derived when lead dampers are mounted to a bilinear model structure which can be simplified as a single-degree -freedom system. The additional damping ratios under different seismic levels are studied. The results show that the additional damping ratio varies with the increment of the structural deformation. Before the structure yields, the additional damping ratio is increased at first and then decreased, while its elastic potential energy reduces after the structure yields. The additional damping ratio provided by the well-designed lead dampers increase with the increment of the structural deformation. The lead damper design principles and methods are also discussed.
出处
《工程力学》
EI
CSCD
北大核心
2014年第3期173-180,共8页
Engineering Mechanics
基金
国家自然科学基金青年科学基金面上项目(51008010)
关键词
有效阻尼比
铅消能器
消能减震
抗震设计
双线性模型
effective damping ratio
lead damper
energy dissipation
seismic design
bilinear model
