为了研究近断层地震动作用对不同类型隔震系统地震反应的影响规律，对比分析了线性阻尼隔震与非线性隔震系统在不同脉冲周期近断层地震动作用下的地震反应，并提出了近断层地震动作用下隔震系统的改进方案.首先，采用三角函数衰减模型模拟分析近断层地震动作用的速度脉冲特性,根据其脉冲周期分布情况和结构基本周期选取了三条代表性近断层地震波。然后，考虑上部结构非线性，对线性阻尼隔震、非线性隔震和联合隔震的八层钢框架结构进行了地震反应时程分析。结果表明，较非线性隔震，线性阻尼隔震且阻尼比为0.2~0.3时能够满足大震时控制隔震层位移、小震时控制上部结构反应的理想隔震目标，且对不同脉冲周期具有适应性。脉冲周期接近或大于结构共振周期时，改进的联合隔震能进一步提高隔震效果和隔震安全性。
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.
关键词
隔震 /
近断层地震动作用 /
粘滞阻尼 /
滞回阻尼 /
脉冲模型
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Key words
base isolation /
near-fault ground motion /
viscous damping /
hysteretic damping /
pulse model
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