Damage control of seismic-isolated structure systems under near-fault earthquakes#br#

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (19) : 183-189.

XIE Yunfei1,3, LIU Yang2, HE Wenfu3

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Abstract

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.

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isolated structure / damage control / near-fault earthquakes / impact;

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XIE Yunfei1,3, LIU Yang2, HE Wenfu3. Damage control of seismic-isolated structure systems under near-fault earthquakes#br#[J]. Journal of Vibration and Shock, 2018, 37(19): 183-189

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