摘要
基于分布参数体系并结合基础隔震框架结构的特点,介绍考虑非比例阻尼的基础隔震分布参数剪切型悬臂梁模型的建立及求解过程。通过此模型,研究固定支座、比例阻尼隔震和非比例阻尼隔震模型的动力特征,并采用振型分解时程分析方法,对比分部设计方法、比例阻尼隔震和非比例阻尼隔震下模型的响应。结果表明:复振型分解方法和实振型分解方法在求解隔震结构的动力特征方面差别较小;隔震层对高阶振型周期的影响有限,但可有效降低结构高阶振型的振型参与系数;分部设计方法与非比例阻尼方法计算的楼层剪力分布结果差异较小;采用包含隔震层的整体模型分析时,建议采用考虑非比例阻尼特征的复振型分解方法。
Based on the distributed parameter system and the characteristics of the base-isolated frame structure,the construction and solution process of the shear cantilever beam model with distributed parameter of base-isolated considering non-proportional damping were introduced,and the dynamic characteristics of fixed bearing,proportional damping isolation and non-proportional damping isolation models through the model were also studied.The modal decomposition time history analysis method was used to compare the response of the model under partial design method,proportional damping isolation and non-proportional damping isolation.The results showed that the complex mode decomposition method and the real mode decomposition method had few differences in solving the dynamic characteristics of the isolated structures.The isolation layer had limited influence on the period of high-order vibration modes,but it could effectively reduce the modal participation coefficient of high-order vibration modes.The differences between floor shear distribution calculated by the division design method and non-proportional damping method were small.When the overall model with the seismic isolation layer was adopted to analyzed seismic responses,the decomposition method of complex vibration modes considering the non-proportional damping characteristics was recomnended first.
作者
彭凌云
刘文
孙睿
PENG Lingyun;LIU Wen;SUN Rui(Beijing Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China)
出处
《工业建筑》
CSCD
北大核心
2022年第2期52-58,168,共8页
Industrial Construction
基金
国家自然科学基金重点项目(51738001)。
关键词
基础隔震
非比例阻尼
剪切型悬臂梁
动力特征
分部设计方法
base isolation
non-proportional damping
shear cantilever beam
dynamic characteristics
division design method
作者简介
第一作者:彭凌云,男,1976年出生,博士,教授。电子信箱:ply@bjut.edu.cn。
