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《Journal of Vibration and Shock》 2015-16
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Shaking table test and comparison analysis for base-isolated high-rise buildings with different aspect ratios

WANG Dong;L Xi-lin;LIU Zhong-po;Tongji University,College of Civil Engineering;  
Due to the development of isolation material and improvement of design concept and analysis method,the application of base isolation is extending to high-rise buildings with large aspect ratios. Shaking table tests were 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 of various intensity. The comparison of dynamic characteristics between base-fixed and base-isolated buildings was performed simultaneously. A scaled 7-story steel frame was built as a 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 natural periods of base-isolated models with aspect ratios 3,5 and 7,compared with that of base-fixed model,prolong from 0. 267 s to0. 549 s,0. 719 s and 0. 8 s respectively. On the other hand,the maximum peak accelerations of top story under designed earthquake level decrease from 0. 61 g to 0. 15 g,0. 16 g and 0. 18 g. Moreover,it is found that the structural global drift angle increases and anti-overturning performance degenerates with the increase of aspect ratio. As a supplement,a threedimensional finite element( FE) model was created and a good consistency between the results of FE analysis and test is observed.
【Fund】: 国家自然科学基金重大研究计划集成项目:91315301-4;国家自然科学基金重大国际合作项目:51261120377
【CateGory Index】: TU973.3;TU352.12
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