无填充墙基础隔震RC框架在环境激励下的动力特性
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摘要
对一基础隔震钢筋混凝土框架结构在无填充墙情况下进行了环境激励下的动力测试,重点利用Hilbert-Huang变换与随机减量技术相结合的方法识别了其模态参数,并与随机子空间识别法、有理分式多项式法识别的结果进行了对比。识别结果表明在环境激励下,基础隔震结构的基本周期远小于多遇和罕遇地震工况下设计计算的基本周期;等效黏滞阻尼比很小,近乎于基础固定模型。对隔震层阻尼特性的分析表明,环境激励下可以将基础隔震结构视为经典的比例阻尼系统。进一步以识别的模态参数为基准,采用优化的方法数值反演了环境激励下该结构隔震层的实际水平等效刚度,结果表明其值为多遇地震下计算刚度取值的10.75倍。
Ambient vibration test was conducted in a base-isolated reinforced concrete frame building without infill walls.Then modal parameters were identified by the approach using Hilbert-Huang Transform(HHT) and random decrement technique(RDT).And identified results were also compared with the results from stochastic subspace identification(SSI) and rational fraction polynomial(RFP) methods.The identified results show that under ambient excitation,fundamental period of the base-isolated structure is far less than the values under frequently and rarely occurred earthquake level.And the equivalent viscous damping ratio is as low as the value of the base-fixed structure.Discussion on the damping characteristics of isolation layer shows that base-isolated structure can be considered as the classical proportional damping system under ambient excitation.Finally,identified modal parameters were used as the updating benchmark and the actual equivalent horizontal stiffness of isolation layer was inversed numerically using the multi-objective optimization method.The results show that the actual stiffness value is 10.75 times of that in the design case under frequently occurred earthquake level.
Ambient vibration test was conducted in a base-isolated reinforced concrete frame building without infill walls.Then modal parameters were identified by the approach using Hilbert-Huang Transform(HHT) and random decrement technique(RDT).And identified results were also compared with the results from stochastic subspace identification(SSI) and rational fraction polynomial(RFP) methods.The identified results show that under ambient excitation,fundamental period of the base-isolated structure is far less than the values under frequently and rarely occurred earthquake level.And the equivalent viscous damping ratio is as low as the value of the base-fixed structure.Discussion on the damping characteristics of isolation layer shows that base-isolated structure can be considered as the classical proportional damping system under ambient excitation.Finally,identified modal parameters were used as the updating benchmark and the actual equivalent horizontal stiffness of isolation layer was inversed numerically using the multi-objective optimization method.The results show that the actual stiffness value is 10.75 times of that in the design case under frequently occurred earthquake level.
引文
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[3]GB50011-2001建筑抗震设计规范(2008年版)[S].北京:中国建筑工业出版社,2008.GB50011-2001Code for Seismic Design of Buildings(2008 ed.)[S].Beijing:China Architecture&Building Press,2008.(in Chinese)
[4]Ventura C E,Finn W D L,Lord J F,et al.Dynamic characteristics of a base isolated building from ambient vibration measurements and low levelearthquake shaking[J].Soil Dynamics and Earthquake Engineering,2003,23(4):313-322.
[5]韩建平,王洪涛,刘云帅,等.环境激励下基础隔震结构的主要动力特性研究[J].振动与冲击,2011,30(11):281-286.HAN Jianping,WANG Hongtao,LIU Yunshuai,et al.Investigation on main dynamic characteristics of base-isolated structures under ambient ex-citation[J].Journal of Vibration and Shock,2011,30(11):281-286.(in Chinese)
[6]Doebling S W,Farrar C R,Prime M B,et al.Damage identification and health monitoring of structural and mechanical systems from changes intheir vibration characteristics:A literature review[R].Los Alamos National Laboratory,Los Alamos,New Mexico,1996.
[7]陈隽,徐幼麟.HHT方法在结构模态参数识别中的应用[J].振动工程学报,2003,16(3):383-388.CHEN Jun,XU Youlin.Application of HHT for modal parameter identification to civil structures[J].Journal of Vibration Engineering,2003,16(3):383-388.(in Chinese)
[8]韩建平,李林,王洪涛,等.基于Hilbert-Huang变换和随机减量技术的模态参数识别[J].世界地震工程,2011,27(1):72-77.HAN Jianping,LI Lin,WANG Hongtao,et al.Modal parameter identification based on Hilbert-Huang transform and random decrement technique[J].World Earthquake Engineering,2011,27(1):72-77.(in Chinese)
[9]杜永峰,李慧,Spencer B F,等.非比例阻尼隔震结构地震响应的实振型分解法[J].工程力学,2003,20(4):24-32.DU Yongfeng,LI Hui,Spencer B F,et al.Real mode superposition method for analysis of seismic response of non-proportionally damped isolatedstructures[J].Engineering Mechanics,2003,20(4):24-32.(in Chinese)
[10]杜永峰,张迪,党育,等.基础隔震结构简化模型的振动参数识别[J].世界地震工程,2001,17(2):53-58.DU Yongfeng,ZHANG Di,DANG Yu,et al.Identification of vibration parameters of simplified base isolation models[J].World Earthquake En-gineering,2001,17(2):53-58.(in Chinese)
[11]明图章,胡光伟,黄卫.大跨径钢桥面铺装体系多目标优化设计[J].土木工程学报,2007,40(2):70-73.MING Tuzhang,HU Guangwei,HUANG Wei.Multiple-objective optimum design of pavement system for long-span steel bridges[J].China CivilEngineering Journal,2007,40(2):70-73.(in Chinese)
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