Shaking table tests for rigid sliding plate-resetting rubber bearing isolation structure

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (15) : 108-117.

LI Wujie1,2, LAI Zhengcong1,2, FENG Yunlong1,2, BAI Yu1,2, ZHOU Lichao1, ZHANG Tianqing3

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Abstract

A new type of self-reset sliding friction isolation bearing is developed, in which the vertical support and horizontal reset elements are separated from each other independently, and the friction energy dissipation and self-reset function are completed by rigid slider and elastic rubber respectively. The basic structure and working principle of the bearing are expounded, and the theoretical restoring force model of this type of bearing is put forward and tested. A full-scale model of three-story prefabricated steel frame is designed and made. two natural waves and one artificial wave are selected to carry out 7-degree (0.15g) earthquake simulation shaking table tests on base-isolated and non-isolated structures. The results show that the constitutive relation of each component of the new bearing is independent and clear, the force transfer path is clear, and it is easy to assemble and replace, and the seismic response of the isolated structure with this bearing is obviously smaller than that of the non-isolated structure under the action of various levels. the isolation effect tends to be significant with the increase of the peak acceleration of the test ground motion. The hysteretic curve of the isolation layer is full, which can effectively absorb and dissipate seismic energy, each bearing always maintains good vertical stability, there is no overturning and lifting phenomenon, and the structural isolation layer replaces well after the earthquake.

Key words

base-isolated / sliding friction bearing / self-reset / full-scale model / shaking table test of seismic simulation

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LI Wujie1,2, LAI Zhengcong1,2, FENG Yunlong1,2, BAI Yu1,2, ZHOU Lichao1, ZHANG Tianqing3. Shaking table tests for rigid sliding plate-resetting rubber bearing isolation structure[J]. Journal of Vibration and Shock, 2023, 42(15): 108-117

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