Seismic response control of a base isolated structure-nonstructural coupling system under near-fault vertical earthquakes

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (22) : 130-136.

LIU Dewen1, ZHAO Jie1, LIU Yang2

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Abstract

Near-fault vertical ground motions tend to cause the amplification of seismic responses of nonstructural components in an isolated structure. To study the mechanism of dynamic response control for nonstructural components in the isolated structure under near-fault vertical ground motions, a model for the base isolated structure-nonstructural coupling system was established. The seismic response control effect of nonstructural components with the quasi zero stiffness of isolation system was analyzed by using the non-linear time history response analysis method. Based on the energy analysis method, the energy balance equation for the base isolated structure-nonstructural coupling system was established. The results show that when using the vertical quasi zero stiffness system, the seismic isolation efficiency of nonstructural components is remarkable for the base isolation system with different natural frequency. The vertical elastic recovery and damping energy of the seismic isolated structure model with quasi zero stiffness are much bigger than those of the base isolated structure with fixed nonstructural component system. It is beneficial to control near-fault vertical seismic responses of nonstructural components by setting reasonable damping ratio.

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near-fault vertical ground motion / base isolated structure-nonstructural coupling system / seismic response control

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LIU Dewen1, ZHAO Jie1, LIU Yang2 . Seismic response control of a base isolated structure-nonstructural coupling system under near-fault vertical earthquakes[J]. Journal of Vibration and Shock, 2019, 38(22): 130-136

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