高烈度地震区角钢格构式变电构架地震响应分析

Seismic Response Analysis of Angle Lattice Gantry in High Intensity Seismic Regions

以位于抗震设防烈度9度的230 kV角钢格构式变电构架为研究对象,采用有限元分析软件SAP2000建立变电构架的有限元分析模型,研究近场地震动作用下230 kV角钢格构式变电构架的地震响应。研究结果表明:9度设防地震作用下,构架位移角不满足规范对弹塑性层间位移角限值的规定;构架梁动力反应放大系数最大可达2.81,在验算此处电气设备抗震性能时应特别注意;同时构架柱底部杆件应力超出较多,构架整体偏于不安全。

A 230 kV angle lattice gantry is taken as the research object which located at a seismic fortification intensity of 9 degrees.Using software SAP2000,a finite element analysis model of the substation structure is established to study the seismic response of the 230 kV angle lattice substation gantry under near-fault pulse ground motions.The result shows that,under 9 degree seismic fortification,the displacement angle can not meet the requirement of the specification for the limit value of elastic-plastic interlayer displacement angle.The maximum amplification coefficient of the dynamic response can reach 2.81,which deserves special attention when checking the seismic performance of electrical equipment.Furthermore,the stress of the members of the bottom columns significantly exceeds the allowable value,which deteriorates safety of the gantry.