基于构件模态应变能比的隔震烟风道结构等效线性化分析  

Equivalent linear analysis of isolated gas duct based on the modal potential energy ratio

作　　者：冯若愚[1] 刘健[1] 柏洁[1] 王辉[1] FENG Ruoyu;LIU Jian;BAI Jie;WANG Hui(School of Civil Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学土建与水利学院,山东济南250061

出　　处：《河海大学学报（自然科学版）》2018年第4期346-352,共7页Journal of Hohai University(Natural Sciences)

基　　金：山东大学国家级大学生创新创业训练计划(201610422087);国家自然科学基金(41172267);"十二五"国家科技支撑计划(2015BAB07B05)

摘　　要：对大型烟风道采用热滑移型双凹摩擦摆(thermal sliding double concave friction pendulum system,TS-DCFP)隔震的结构等效线性化方法进行研究。推导了TS-DCFP采用滑移面等效半径、等效摩擦系数表达的三线性滞回模型的等效刚度和等效阻尼比,适于以非线性变形为主的摩擦摆隔震结构。建立了横向地震作用下的二自由度结构动力分析模型,基于构件模态应变能比,推导了振型组合阻尼比公式。采用提出的等效参数对二自由度烟风道隔震结构进行线性时程分析,并与三维模型非线性时程分析结果进行比较。分析表明,TS-DCFP用于烟风道隔震效果相当显著,且本文提出的等效线性化方法对道体反力、底部剪力的估计接近非线性时程分析结果,用于结构初步设计选型很有效。An equivalent linear model for the seismic analysis of the isolated gas duct using thermal sliding double concave friction pendulum(TS-DCFP)system is established.The structure is modeled as a two-degree-of-freedom system in the transverse direction.Meanwhile,the effective stiffness and equivalent viscous damping ratio of an isolation bearing with tri-linear behavior are derived and the modal-combined damping ratio is obtained from the modal potential energy ratio of components.The model is verified by comparing the response of a linear time history analysis of the two-degree-of-freedom system with that from the 3D nonlinear time history analysis using the directly integrating method.

关 键 词：隔震 烟风道 双凹摩擦摆 等效线性化模型 模态应变能比 

分 类 号：O39[理学—工程力学]