近断层地震动脉冲特性对设备-结构耦合隔震体系响应的影响

基于设备?结构耦合隔震体系模型，选取了50条近断层脉冲型地震波，以脉冲周期与结构基本周期比T_P/T＝1为分界线，分析了周期比和脉冲能量对结构响应的影响，并对穿零次数小于等于5的隔震层位移比与周期比和脉冲能量的关系进行了拟合。结果表明:脉冲特性对结构的影响主要与周期比T_P/T和脉冲能量有关，同时也需考虑速度脉冲对应的加速度曲线穿零次数的影响；此外，设备响应与顶层楼面加速度直接相关，与近断层地震动的脉冲特性则无明显相关性。 

Effect of pulse characteristics of near-fault ground motions on the response of equipment-structure coupled isolation system

Based on the model of equipment-structure coupled isolation system, 50 near-fault pulse-like seismic waves were selected and the effect of period ratio T_P/T （the ratio of the pulse period to the basic period of the structure） and pulse energy on the structural response was analyzed using T_P/T＝1 as the dividing line; and the relationships between the displacement ratio of isolation layer and the period ratio and pulse energy were fitted while the zero-crossing times is not less than 5. The analyses show that the influence of pulse characteristics on the structure is mainly related to the period ratio T_P/T and the pulse energy, while the influence of the zero-crossing times of the acceleration curve corresponding to the velocity pulse needs to be considered. Furthermore, the equipment response is directly related to the top floor acceleration, but there is no significant direct correlation with the pulse characteristics of near-fault ground motions.