悬挂结构动力特性的时频分析
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摘要
采用振型叠加法对悬挂结构系统的运动特性进行分析研究;通过对悬挂子结构和主支撑结构的相互作用进行频域分析,提出地震动激励下悬挂子结构对主支撑结构的作用是在主支撑结构上添加悬挂子结构的复惯性质量,即悬挂子结构静态和动态质量(悬挂子结构振动作用与引起振动的外界激励加速度的比值)之和;根据悬挂子结构的复惯性质量和主支撑结构的模态参数,对悬挂结构系统的耦合动态响应进行了频域研究,采用时程分析方法对结果进行验证;同时,对悬挂结构系统与TMD/MTMD的减震原理进行了比较分析。
Suspension primary-secondary structures dynamic characteristics in both time domain and frequency domain were investigated.Complex inertia mass was presented,which was equal to the sum of statistic and dynamic mass,and was equal to the specific value of the vibrating excitation and the vibrating action output of suspension secondary structure.Therefore,the action from suspension secondary structure to primary structure in earthquake excitation was equal to that complex inertia mass of secondary structure was added on primary structure.Based on complex inertia mass,the coupled dynamic characteristics of three suspension structure systems models in different modal frequency overlapping scale between suspension primary structure and secondary structure were studied.In addition,it was compared with the shock absorption principium of TMD/MTMD.
Suspension primary-secondary structures dynamic characteristics in both time domain and frequency domain were investigated.Complex inertia mass was presented,which was equal to the sum of statistic and dynamic mass,and was equal to the specific value of the vibrating excitation and the vibrating action output of suspension secondary structure.Therefore,the action from suspension secondary structure to primary structure in earthquake excitation was equal to that complex inertia mass of secondary structure was added on primary structure.Based on complex inertia mass,the coupled dynamic characteristics of three suspension structure systems models in different modal frequency overlapping scale between suspension primary structure and secondary structure were studied.In addition,it was compared with the shock absorption principium of TMD/MTMD.
引文
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[2]王肇民,邓洪洲,董军.高层巨型框架悬挂结构体系抗震性能研究[J].建筑结构学报,1999,20(1):23-30.WANG Zhao-min,DENG Hong-zhou,DONG Jun.AStudy of Aseismic Properties of Huge Frame Suspen-ded Structure in Tall Buildings[J].Journal of BuildingStructures,1999,20(1):23-30.
[3]张耀华,梁启智.巨型框架悬挂体系抗震原理及初步设计方法[J].工程力学,2000,17(3):10-17.ZHANG Yao-hua,LIANG Qi-zhi.The Earthquake Re-sistant Philosophy and Initial Design of Megaframewith Suspension Systems[J].Engineering Mechanics,2000,17(3):10-17.
[4]史庆轩,杨文星,门进杰.单自由度体系非线性地震能量反应的计算[J].建筑科学与工程学报,2005,22(2):25-29.SHI Qing-xuan,YANG Wen-xing,MEN Jin-jie.Calcu-lation of Seismic Energy Response for Nonlinear SingleDegree of Freedom System[J].Journal of Architectureand Civil Engineering,2005,22(2):25-29.
[5]沈蒲生,刘杨.水平地震作用下框支剪力墙结构的变形研究[J].建筑科学与工程学报,2005,22(1):58-63.SHEN Pu-sheng,LIU Yang.Distortion Research ofShear Wall Structure Supported on Frame UnderEarthquake Actions[J].Journal of Architecture andCivil Engineering,2005,22(1):58-63.
[6]GIUSEPPE M.Dynamic Response of Multiply Con-nected Primary-Secondary Systems[J].Earthquake En-gineering and Structure Dynamics,1990,19(2):205-216.
[7]涂文戈,邹银生.MTMD减震结构体系的频域分析[J].工程力学,2003,20(3):78-89.TU Wen-ge,ZOU Yin-sheng.Analysis of MultistoryStructures with MTMD in Frequency Domain[J].En-gineering Mechanics,2003,20(3):78-89.
[8]涂文戈,邹银生.MTMD对建筑结构多模态控制的减震分析[J].地震工程与工程振动,2003,23(5):174-179.TU Wen-ge,ZOU Yin-sheng.Study on MultistoryStructures with Multi-mode Control of MTMD[J].Earthquake Engineering and Engineering Vibration,2003,23(5):174-179.
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