Shaking table test and comparison analysis for base-isolated high-rise buildings with different aspect ratios

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (16) : 109-118.

WANG Dong，Lü Xi-lin，LIU Zhong-po

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Abstract

Duing to the development of isolation material and improvement of design concept and analysis theory, the application of base isolation is extending to high-rise buildings with large aspect ratios. In this paper, the shake table tests have been carried out to investigate the dynamic characteristics and seismic responses of high-rise base-isolated buildings with different aspect ratios when subjected to different earthquake records at various intensity. The comparison of dynamic characteristics between base-fixed and base-isolated buildings was performed simultaneously. A scaled 7-story steal frame was built as specimen model and six lead-core laminated rubber bearings were selected as isolation devices. In tests, the aspcet ratio of model can be changed by shifting the bearings. The results of the shaking table tests convey that the nature periods of base-isolated models with aspect ratios 3, 5 and 7, compared with that of base-fixed model, prolong from 0.267s to 0.549s, 0.719s and 0.800s respectively. In the other hand, the maximum peak accelerations of top story under design earthquake level decreased from 0.61g to 0.15g, 0.16g and 0.18g. Moreover, it was found that structure global drift angle increases and anti-overturning performance degenerates while increasing aspect ratio. As supplementary, a three-dimensional finite element (FE) model was created and a good consistent between results of FE analysis and test can be observed.

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base-isolated high-rise building / aspect ratio / acceleration response / integral stability / numerical simulation

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WANG Dong，Lü Xi-lin，LIU Zhong-po. Shaking table test and comparison analysis for base-isolated high-rise buildings with different aspect ratios[J]. Journal of Vibration and Shock, 2015, 34(16): 109-118

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