不同时频特性近断层地震作用下的结构响应研究

Study on structural dynamic response under near fault ground motion with different time-frequency characteristics

研究不同时频特性的地震波作用下,抗震结构和隔震结构耦合设备的动力响应,对五层钢框架振动台模型试验数据进行小波分析。结果表明:主结构动力响应与地震波时频特性直接相关;由于主结构和隔震支座的滤波作用,设备的动力响应受地震波时频特性影响显著,但不具有直接相关性;隔震结构可以使设备的频率远离主结构的频率,从而降低设备的放大系数;设备耦合之后主体结构加速度的变化趋势取决于不同时频特性的地震波能量分布。

The dynamic response of the anti-seismic structure and the seismic isolation structure Coupled equipment under the action of seismic waves with different time-frequency characteristics is studied,and the wavelet analysis of the test data of the five-layer steel frame shaking table model is carried out.The results show that:the dynamic response of the main structure is directly related to the time-frequency characteristics of seismic waves;due to the filtering effect of the main structure and seismic isolation bearings,the dynamic response of the equipment is significantly affected by the time-frequency characteristics of seismic waves,but there is no direct correlation;isolation can reduce the amplification coefficient of the equipment by moving the frequency of the device away from the frequency of the main structure;the variation trend of the acceleration of the main structure after coupling the equipment depends on the seismic wave energy distribution with different time-frequency characteristics.