三线性双凹摩擦摆隔震烟风道结构等效线性化分析  

Eqivalent linear analysis of isolated gas duct using DCFP bearing with Tri-linear behaviors

作　　者：冯若愚 陈瑛[2] 刘健[2] 柏洁[2] FENG Ruoyu;CHEN Ying;LIU Jian;BAI Jie(School of Aerospace Engineering,Tsinghua University,Beijing 100084,China;School of Civil Engineering, Shandong University,Jinan 250061 ,China)

机构地区：[1]清华大学航空航天学院,北京100084 [2]山东大学土建与水利学院,山东济南250061

出　　处：《地震工程与工程振动》2018年第6期182-189,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(41172267);国家科技支撑计划项目(2015BAB07B05);2016年国家级大学生创新创业训练计划项目(201610422087)~~

摘　　要：首次对大型烟风道采用双凹摩擦摆(DCFP)隔震的结构等效线性化方法进行了研究。推导了三线性滞回模型DCFP的等效刚度和等效阻尼比,建立了横向地震作用下的两自由度结构动力分析模型,推导了振型组合阻尼比公式。研究了烟风道支架质量比、刚度比对组合阻尼比的影响。采用提出的等效参数对烟风道隔震结构进行了线性时程分析,并与非线性时程分析结果比较。本文提出的等效线性化方法对道体的位移和反力、底部剪力的估计接近非线性时程分析结果,且优于单自由度结构等效线性化模型。An equivalent linear model for the seismic analysis of isolated gas duct using double concave friction pendulum isolators(DCFP) is firstly established. The structure is modeled as two-degree-of-freedom system in the transverse direction. The effective stiffness and equivalent viscous damping ratio of a isolation bearing with tri-linear behavior are derived, and the system composite damping ratio is obtained. The parametric influences including those of the mass ratio, stiffness ratio on the composite damping ratio are investigated. The model is verified by comparing the response of linear time history analyses with that from the nonlinear time history analyses. It is demonstrated that the proposed equivalent linear model yields more accurate results when compared with equivalent linear models based on single-degree-of-freedom systems.

关 键 词：隔震 烟风道 双凹摩擦摆 等效线性化模型 

分 类 号：TU352.12[建筑科学—结构工程]