近断层地震动作用下冷却塔地震反应分析

摘要

According to characteristics of near-fault ground motions,A 3D finite element model is established for cooling tower in power plant.Multi-strip seismic motion record is selected for inputs.Seismic analysis has been made for cooling tower by time history analysis method.Results has been analyzed under input of velocity pulse records and no velocity pulse records,comparative analysis has been made for results under general seismic action,indicating that this kind of structures are sensitive under the near-fault earthquake motion effect.The influence degree under seismic damage was even larger in near fault area.%针对近断层地震动特征,以火电厂冷却塔为例,建立了三维有限元模型.选取多条近断层地震动记录作为地震动输入,采用时程分析方法对冷却塔进行地震反应分析,分析了含速度脉冲和无速度脉冲地震动输入下的结果,并与一般地震动作用下的结果进行了对比分析.结果表明,该类构筑物对近断层地震动作用较为敏感,近断层处冷却塔的地震破坏影响程度更大.