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本文采用通用有限元分析软件SAP2000,通过建立一个由框架单元组成的全刚接模型,对钢管角钢组合输电塔架进行了动力特性和地震时程分析,得出结论如下:在对钢管角钢组合输电塔进行动力分析时,需要采用有限元分析方法得到杆塔的自振周期,传统的周期计算公式仅能用于大致估算;通过研究低阶振型图可以直观看出结构的相对薄弱部位,通过地震波的功率谱密度图能够直观地对比出不同地震波能量的大小,进而定性地判断不同地震波对输电塔地震反应影响的大小;考虑导线质量后的输电塔模型相比单塔模型,无论是塔体顶点还是地线悬挂点位移,在地震波激励下均有增大。
In this paper, a general finite element analysis software named SAP2000 is used to analyze the dynamic characteristics and seismic time history of a steel-pipe angle-steel composite transmission tower by establishing a full-rigid connection model consisting of frame elements. The conclusions are as follows: When the tower is subjected to dynamic analysis, the natural period of the tower needs to be obtained by finite element analysis. The traditional periodic calculation formula can only be used for approximate estimation. By studying the low-order vibration patterns, the relatively weak parts of the structure can be visually recognized. Power spectral density graph can directly compare the different seismic wave energy, and then qualitatively determine the magnitude of the impact of different seismic waves on the seismic response of transmission towers. Compared with the single-tower model, considering the quality of the transmission line tower model, Or ground suspension point displacement, both in seismic waves have increased incentives.