近断层地震作用下混合阻尼隔震结构的响应分析

本文以实际的地震波El-Centro波为底波,在此基础上叠加三角型脉冲运动模拟近断层地震地面的激励;以人工合成的近断层地震波作为输入,研究其对混合阻尼隔震结构的动力反应特性,绘制了上部结构最大加速度和基底最大滑移量的时程图,并讨论了混合阻尼隔震结构的摩擦系数、粘滞阻尼比及滞回阻尼等参数对隔震结构产生的重要影响.研究表明:在混合阻尼隔震结构中,摩擦系数存在一个较优值,粘滞阻尼比对脉冲能量较大的B、C类波的控制有较显著的效果,但对原始波及A类波控制效果不明显,滞回阻尼对隔震结构Smax和amax均有一定影响,通过分析给出了该参数的合理取值.

Seismic Analysis of Hybrid Damping Base-isolated System Against Near-fault Ground Motions

In this paper, the near-fauh ground motions are simulated by combining recorded E1-Centro ground motions with simple pulses that portray near-fauh features. The seismic dynamic responses of hybrid damping base-isolated system are investigated under near-fauh ground motions, maximum acceleration response of superstnmture and maximum sliding displacement response are plotted . The effects of some design parameters such as friction coefficient, viscous damping ratio and hysteretic damping to the base-isolated system are dissessed. The study result shows that friction coefficient has a optimal value in the hybrid damping base-isolated system, viscous damping ratio has a more remarkable effect to the type B and C pulse than the type A pulse, and hysteretic damping has some influence to the base-isolated system and its reasonable value is gived in this paper.