摘要
以500kV交流高压双回路输电线路为研究对象,对线路中使用频率最高的直线塔和耐张塔进行了地震响应分析.首先,通过对铁塔模型的合理简化,建立了直线塔和耐张塔的杆梁混合单元有限元几何模型,分析了高压直线塔和耐张塔的动力学特性;然后,利用最小均方速度的基线校正方法对三向汶川地震波进行基线校正,以校正后的汶川地震波为激励获得了直线塔和耐张塔的地震时程响应;最后,分析了直线塔和耐张塔地震响应的频率结构.对应杆塔的动力学特性,频谱分析结果表明:无论是单向地震激励还是多向地震激励,都可以激起输电杆塔的共振区.所得结论对杆塔设计、舞动分析计算和输电线路安全运行有重要意义.
With the research object of 500 kV transmission line,do the seismic response analysis of strain tower and tangent tower which are used most frequently.At first,the finite element models including a strain tower,a tangent tower are created with the reasonable simplification of towers.And do the dynamic characteristics analyzes of strain tower and tangent tower.Then use the minimum square velocity method to correct the three direction seismic waves which collected form the earthquake in Wenchuan.Do the timehistory analysis of strain tower and tangent tower with the seismic wave which have been corrected.Finally,analyze the frequency composition of seismic response of strain tower and tangent tower.Compare with the dynamic characteristics results of tower,the frequency spectrum analysis results show that both unidirectional earthquake excitation and multi-directional earthquake excitation can arouse resonance region of transmission tower.The conclusion is significative for the tower design,the analysis of conductor galloping and the safe operation of the transmission line.
引文
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