【摘要】 近断层地震动有着不同于远场地震动的特征。对两个具有典型代表意义的不同自振周期的钢框架基础隔震结构分别输入120条近断层地震波,分析隔震结构的隔震支座位移、上部结构顶层最大位移、顶层最大加速度、层间最大剪力等动力响应参数,与近断层地震动8个特征参数(断层距、地面峰值加速度、地面峰值速度、地面峰值位移、峰值速度与峰值加速度的比值、地震动持时、输入能、脉冲周期与自振周期的比值的相关性,比选出相关性强的能表征近断层地震动破坏作用的主要参数,为基础隔震结构设计选用近断层地震动提供依据。更多还原

【Abstract】 The characteristics of near-fault ground motion differ from those of far-field ground motion.The correlation coefficient between the dynamic responses of base-isolated structures and the parameters of near-fault ground motions were studied.Dynamic responses of base-isolated structures may include the displacement of isolation bearing,the maximum displacement and the maximum acceleration at the top level of superstructure and the maximum inter-story shear,while the parameters of near-fault ground motions include fault distance,peak ground acceleration,peak ground velocity,peak ground displacement,the ratio of peak ground velocity and peak ground acceleration,seismic duration,input energy,the ratio of pulse period and natural period of vibration.120 near-fault seismic waves and two base-isolated structures with their own natural periods were employed in this study.The main parameters which can effectively characterize the damaging effects of near-fault ground motion are compared and selected for the base-isolation design in near-fault area.更多还原