Seismic response analysis of linear damping and nonlinear base-isolated system under near-fault ground motion

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (24) : 108-114.

Gong Wei 1 Xiong Shishu1, 2

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Abstract

To study the effect of the near fault ground motions on the seismic response of various types of isolation systems, the seismic responses of linear damping and nonlinear base-isolated systems under near fault ground motions with different pulse periods are compared. Moreover, an improved near fault isolation system is proposed. First, the pulse behavior of near fault ground motions is simulated by an trigonometric function with attenuation. Three near fault ground motion records are selected based on the pulse period of ground motions and the fundamental period of structures. Then, time-history analysis of an eight story steel frame structure with the linear damping base isolation control with different damping ratio, the nonlinear base isolation control and the combined isolation control are conducted with the consideration of the nonlinear behavior in the superstructure. It is shown that compared with the nonlinear base-isolated system, the linear damping base-isolated system with damping ratio of 0.2~0.3 better satisfies the requirement of the ideal isolation objective, which aims at reducing the isolation displacement under extreme earthquake and reducing the response of superstructure under minor earthquake. This conclusion is suitable for different pulse periods. In addition, the combined isolation control can further improve the isolation effectiveness and isolation safety when the pulse period is closed to or larger than the fundamental period of structure.

Key words

base isolation / near-fault ground motion / viscous damping / hysteretic damping / pulse model

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Gong Wei 1 Xiong Shishu1, 2. Seismic response analysis of linear damping and nonlinear base-isolated system under near-fault ground motion[J]. Journal of Vibration and Shock, 2016, 35(24): 108-114

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