Near-fault earthquakes tend to cause isolation layer’s larger displacement of seismic- isolated structures.Larger displacement leads to impacts between seismic-isolated structures and earth-retaining walls.To study damage performance and damage control mechanism, the analysis model for a seismic-isolated structure considering structure damage was established.Damage control effects of the seismic-isolated structure with added viscous damping ratios, variable frequency isolators and added buffer limit devices were compared using the elastic-plastic time history analysis method.The study results showed that when displacement of isolation layer of the seismic-isolated structure under near-fault ground motions is beyond the isolation joint spacing, the larger the displacement value, the more serious the damage of the structure; when using the three methods above mentioned to control damage under near-fault earthquake, the seismic-isolated structure’s damage under the designed ground motion is slight, using added viscous damping ratio is the most effective approach to control structure damage under nearly-fault earthquake, using variable frequency vibration isolation system has the best effect.The results provided a reference for damage control of seismic-isolated structures under near-fault earthquakes.
谢云飞1,4，刘阳2,3，何文福4. 近断层地震下隔震系统的损伤控制研究[J]. 振动与冲击, 2018, 37(19): 183-189.
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