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| Shaking table test of geotechnical seismic isolation system based on glass bead-sand cushions#br# |
| JING Liping1，2，3，YIN Zhiyong1，2，SUN Haifeng4，DONG Rui1，2，XU Kunpeng1，2，CHENG Xinjun5#br# |
(1. Institute of Engineering Mechanics，China Earthquake Administration，Harbin，Heilongjiang 150080，China；2. Key Laboratory of Earthquake Engineering and Engineering Vibration，China Earthquake Administration，Harbin，Heilongjiang 150080，China；3. Institute of Disaster Prevention，Langfang，Hebei 065201，China；4. Zhuhai Engineering Investigation Institute of Guangdong Province，Zhuhai，Guangdong 519000，China；5. School of Civil and Architectural Engineering，East China University of Technology，Nanchang，Jiangxi 330013，China)
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Abstract In this paper，a geotechnical seismic isolation system(GSI-GBSC) based on glass bead-sand cushions is proposed to protect structures against the destroying effects of earthquakes，which is to backfill the glass bead-sand cushion material between the structural foundation and the foundation soil for isolation. A large-scale shaking table model test which considers the field was carried out through the single-layer masonry structure model with and without isolation system. The scale ratio of the single-layer masonry structure model was 1/4. The north-south component of the El-Centro wave recorded in 1940 was selected as the input wave，and the peak input acceleration(PIA) was adjusted to 0.1 g，0.2 g and 0.4 g respectively. The test results show that the isolation effect of GSI-GBSC system is not significant enough when the minor earthquake occurs but the isolation effect strengthens with enhancing the earthquake intensity. When PIA is 0.4 g，the GSI-GBSC system decreases the roof acceleration and the inter-story drift of the structure by 50% and 47.5%，respectively，which means the GSI-GBSC system can significantly reduce the earthquake response of the superstructure and achieve seismic isolation.
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2020, Vol. 39 
