Author:
Lyu Qing,Zhu Baijie,Lu Wensheng,Fu Bo,Liu Liangkun,Qian Wei,Zhou Ming,Zhang Zhenya
Abstract
A five-story moment frame structural model with a base isolation system was tested on a shaking table. The isolation system comprised both linear natural rubber bearing (LNR) and nonlinear viscous dampers (NLVDs). Seven ground motions were employed: including three far-fault (FF) and four near-fault (NF) earthquake ground motions. The performance of the isolation system was evaluated by measuring the displacement and base shear of the isolation bearings. Furthermore, the axial force and displacement of the NLVDs were measured. The evolution of the fundamental dynamic frequency of the frame during the test was also determined. During strong earthquakes, NF ground motions caused larger story drifts and floor accelerations of the superstructure than FF ground motions. The displacement and base shear of the isolation base was very large when the isolated structure was subjected to Kobe_TAK000 and ChiChi_TCU102/278 pulse-like NF ground motions. Furthermore, the LNR s experienced tension and uplift when the PGA of input earthquake ground motions was larger than 0.80 g. Although the NLVDs performed very well in combination with the LNRs, the severe responses of the isolation bearings were caused by NF ground motion with a pulse period Tp neighboring the fundamental period of the isolated structure.
Funder
National Natural Science Foundation of China
Opening Funds of State Key Laboratory of Building Safety and Built Environment and National Engineering Research Center of Building Technology
Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration
Basic Public Welfare Research Project of Zhejiang Province, China
Natural Science Foundation of Zhejiang province, China
Subject
Building and Construction,Civil and Structural Engineering,Architecture
Cited by
1 articles.
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