考虑频率相关性粘弹性阻尼器减震高压电气设备结构性能分析

Dynamic analysis of high voltage electrical equipment with viscoelastic dampers considering frequency dependence

粘弹性材料的耗能能力往往受到加载频率的影响,然而对减震结构进行地震动响应分析时鲜有考虑该影响因素。地震动荷载中往往包含复杂的频率成分,若能考虑频率的影响效应,将使数值仿真更加符合实际。基于广义Maxwell模型的粘弹性本构关系,采用ANSYS软件建立了包含粘弹性阻尼减震垫高压电气设备结构模型,计算减震结构在不同地震动输入下的响应,与等效弹簧阻尼模型计算结果对比。表明阻尼材料的频率相关性对减震系统地震响应存在一定的影响,幅值约为12%,且影响性态与地震波卓越周期有关。

The energy dissipation capacity of viscoelastic material is often affected by the loading frequency. However,this factor is rarely considered in seismic response analysis of shock-absorbing structures. Earthquake loads often include complex frequency components. If the effect of frequency was taken into account,the numerical simulation would be more realistic. The finite element software ANSYS was used to construct the model of viscoelastic damped pad insulator. The pad is simulated by the solid element of generalized Maxwell constitutive relation and the equivalent linear spring element respectively. The response of the seismic isolation structure under different ground motions is calculated. By comparing the results of two sets of models,it is found that frequency dependence of damping material has some influence on the seismic response of the system. The amplitude is about 12% and the influence form is related to the excellent period of seismic wave.