Investigation on main dynamic characteristics of base-isolated structures under ambient excitation

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	Investigation on main dynamic characteristics of base-isolated structures under ambient excitation
	Han, Jian-Ping 1,2; Wang, Hong-Tao 2; Liu, Yun-Shuai 1,2; Du, Yong-Feng 1,2; Li, Hui 1,2
刊名	Zhendong yu Chongji/Journal of Vibration and Shock
	2011-11-01
卷号	30 期号:11 页码:266-271
关键词	Bridge decks Damping Earthquakes Modal analysis Multiobjective optimization Parameter estimation Stiffness Stochastic systems Structural panels Ambient excitation Dynamic characteristics Finite-element model updating Isolated buildings Modal parameter identification
ISSN号	10003835
英文摘要	Ambient vibration tests were conducted on the two base-isolated buildings. Modal frequencies, mode shapes and modal damping ratios were identified using stochastic subspace identification (SSI) and rational fraction polynomial (RFP) methods. The identified results show that under ambient excitation, fundamental frequencies of these two base-isolated structures are much larger than the values under frequently occurring earthquake level. And the equivalent viscous damping ratio is as low as the value of non-isolated structure, so base-isolated structures can be considered as classical proportional damping system under ambient excitation. Furthermore, taking one of the two buildings as study case, identified modal parameters were used as the updating benchmark and the actual equivalent horizontal stiffness of isolation layer was estimated inversely using the multi-objective optimization method. The results show that the actual stiffness value is 10.9 times of that in the design case under frequently occurring earthquake level. Finally, the preliminary finite element model were updated based on the inversely estimated stiffness of the isolation layer and the updated model was analyzed numerically. Comparison of the results between analysis and test indicates that the updated model can represent the dynamic characteristics of the base-isolated structure under ambient excitation more reliably.
语种	中文
出版者	Chinese Vibration Engineering Society
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/111236]
专题	土木工程学院教务处（创新创业学院）
作者单位	1.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China 2.Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China;
推荐引用方式 GB/T 7714	Han, Jian-Ping,Wang, Hong-Tao,Liu, Yun-Shuai,et al. Investigation on main dynamic characteristics of base-isolated structures under ambient excitation[J]. Zhendong yu Chongji/Journal of Vibration and Shock,2011,30(11):266-271.
APA	Han, Jian-Ping,Wang, Hong-Tao,Liu, Yun-Shuai,Du, Yong-Feng,&Li, Hui.(2011).Investigation on main dynamic characteristics of base-isolated structures under ambient excitation.Zhendong yu Chongji/Journal of Vibration and Shock,30(11),266-271.
MLA	Han, Jian-Ping,et al."Investigation on main dynamic characteristics of base-isolated structures under ambient excitation".Zhendong yu Chongji/Journal of Vibration and Shock 30.11(2011):266-271.