大型变电站在近断层地震动作用下的地震反应分析

Seismic Response Analysis of Large Substations under Near-fault Ground Motions

结合近断层地震动特征,针对我国变电站量大面广的特点,建立了考虑变电站主体结构-电气设备相互作用的三维动力分析模型;选取多条实际近断层地震动记录作为地震动输入,采用非线性动力时程分析方法对大型变电站进行地震反应分析,并与远断层地震动作用下的地震反应结果进行了对比分析。结果表明,大型变电站在近断层地震动作用下的地震反应大于远断层地震动作用下的结果,该类建筑物对近断层地震动的作用较敏感,近断层处变电站的地震破坏影响程度更大。此外,还分析了近断层地震动作用下采用隔震技术的变电站地震反应,发现其抗震性能优于未采用隔震措施的变电站,即隔震技术适用于建造在近断层附近的变电站。

Combining with the characteristics of near-fault ground motions,and according to the specific conditions in China,a three dimensions dynamic analysis model considering interactions of main structure and electrical equipment of the substations is established.The nonlinear time-history dynamic method with a series of near-fault ground motion waves is used in seismic response analysis of large substations,and the results are comparative analyzed with the results of seismic response under far-fault ground motions.It is shown that the reactions of substation buildings under near-fault ground motions are stronger than those in common ground motions and the destruction of the former is more serious than the latter.Meanwhile,the seismic reactions of substations with isolation technology under near-fault ground motions are investigated to compare with those in normal substations.It can be learned that the seismic reactions of isolation substations under near-fault ground motions are better than those substations without isolation technology,which is feasible for the substations built in the regions of near-fault ground.