摘要
大跨越输电塔是风敏感结构,位移风振系数对跨越塔选型优化具有重要意义。以典型500 kV大跨越输电塔为研究对象,分别在ANSYS中建立了单塔和塔线体系有限元模型,通过模态分析得到了跨越塔前3阶自振频率,按照随机振动理论计算了跨越塔整体位移风振系数,跨越塔位移风振系数与高度无关。通过非线性风振响应时程分析,得到了跨越塔典型风压分段代表节点的位移时程曲线,基于有限元计算结果计算了跨越塔各风压分段的位移风振系数及整塔加权值,位移风振系数时域计算值沿高度变化不大。跨越塔位移风振系数频域计算值为1.54,比按照塔线耦合模型在时域计算的位移风振系数整塔加权值低12.9%。
Long span transmission tower is one of the wind sensitive structures.Displacement wind vibration coefficient is important for structural optimization of long span transmission towers.A typical 500 kV long span transmission tower was selected as the investigated object.Both single tower model and tower-line model for this transmission tower were established in ANSYS software.The first three natural frequencies of the long span transmission tower were obtained by modal analysis.Based on the structural random vibration theory,displacement wind vibration coefficient of the long span transmission tower was calculated,which has no relationship with tower heights.Displacement time history curves for representative points at different wind pressure segments were obtained by nonlinear time history wind response analysis.Based on the FEA results,displacement wind vibration coefficients for each wind pressure segments as well as the weighted displacement wind vibration coefficient of the whole transmission tower were calculated.The displacement wind vibration coefficient by time domain method varies not significantly along the tower height direction.Displacement wind vibration coefficient of the long span transmission tower calculated by frequency method is 1.54,which is lower than the weighted value by time domain method by 12.9%.
作者
刘亮
杨风利
王章轩
邵帅
朱姣
沈文韬
LIU Liang;YANG Fengli;WANG Zhangxuan;SHAO Shuai;ZHU Jiao;SHEN Wentao(Construction Branch Corporation,State Grid Jiangsu Electric Power Corporation,Nanjing 210024,China;China Electric Power Research Institute,Beijing 100055,China.)
出处
《结构工程师》
2023年第1期99-106,共8页
Structural Engineers
基金
国家电网有限公司科技项目(SGJSJSOOXMJS2000251)。
关键词
大跨越输电塔
塔线耦合
位移
时程分析
风振系数
long span transmission tower
tower-line coupling effect
displacement
time history analysis
wind vibration coefficient
