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摘要:
The long-span spatial structure is flexible, and the damping ratio of the structure is relatively strong under horizontal and vertical earthquakes, and the uplift force exists at the support. To satisfy the application of seismic isolation of such buildings, the paper proposes an anti-uplift three-dimensional bearing. The bearing is composed of a high damping rubber bearing and an upper disc spring device in series. The horizontal and vertical mechanical properties of the test were studied. In the horizontal direction, the test focuses on the hysteretic behavior of the bearing under simple harmonic excitation, and investigates the influence of shear strain and loading frequency on its horizontal mechanical properties. In the vertical direction, the equivalent stiffness and equivalent damping ratio of the bearing were tested as well. Experimental research was carried out to investigate the effects of different loading amplitudes and different loading frequencies on their vertical hysteresis performance. The results show that the composite isolation bearing has good hysteresis performance in both horizontal and vertical directions. The horizontal equivalent damping ratio is between 12.48% and 14.77%, which decreases with the increase of shear strain, it increases with the loading frequency: the vertical equivalent damping ratio is from 6.67% to 17.76%, vertical loading frequency makes minor effect on it.
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来源 :
IASS 60TH ANNIVERSARY SYMPOSIUM (IASS SYMPOSIUM 2019) - 9TH INTERNATIONAL CONFERENCE ON TEXTILE COMPOSITES AND INFLATABLE STRUCTURES (STRUCTURAL MEMBRANES 2019)
年份: 2019
页码: 2432-2439
语种: 英文