摘要
对于大跨度输电线而言,风场水平特性对输电塔线体系的结构设计有重要影响。我国现有GB50545—2010《110~750kV架空送电线路设计规范》采用风压不均匀系数来衡量风速沿空间分布的不均匀性。在浙江舟山某丘陵地形长约500m的输电线路沿线构建了一套多点同步风速监测系统,采集获得了近1年的风速风向及温度等数据。基于现场实测数据,分析丘陵地形周边的水平风场特性,定量计算不同档距条件下的平均风速不均匀系数和极值风速不均匀系数。讨论了国内外导线风荷载计算方法中风压不均匀系数和档距折减系数的取值依据,并与现场实测数据得出的经验算式进行对比分析。实测得到的极值风速不均匀系数经验式与国内外荷载计算标准档距折减系数取值基本一致,也与DL/T5551—2018规范报批稿中给出的档距折减系数计算式相符。
For long-span transmission lines,the characteristics of horizontal wind have an important influence on the structural design of transmission tower-line systems. Non-uniform factor of wind pressure is adopted in Chinese Code for Design of Overhead Transmission Line( GB 50545-2010) to take into account the spatial distribution of mean wind speeds along the line. A multiple-point synchronous monitoring system was set up for field measurements along a 500-meter long transmission line in hilly terrains,Zhoushan,Zhejiang. Almost one-year duration of wind records were collected. Based on field measurements,the characteristics of horizontal wind were analyzed,and the nonuniform of wind speed was evaluated in terms of non-uniform factors of mean wind speeds and gust wind speeds. The definition and basis of non-uniform factor of wind pressure and span reduction factor given in various design codes were discussed,and compared with the empirical formula of those factors derived from the field measurements. It was demonstrated that the empirical formula of span reduction factor were consistent with the specification of international codes,and agreed well with the provisions of conductor wind loads in the newly submitted version of"Load Code for the Design of Overhead Transmission Line"( DL/T 5551-2018).
作者
卞荣
张弘
吴列阳
俞恩科
黄铭枫
楼文娟
胡文侃
章李刚
BIAN Rong;ZHANG Hong;WU Lieyang;YU Enke;HUANG Mingfeng;LOU Wenjuan;HU Wenkan;ZHANG Ligang(Research Institute of Economic Technology,Zhejiang Provincial Corporation of State Grid,Hangzhou 310058,China;Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,China;State Grid Zhoushan Power Supply Company,Zhoushan 316000,China)
出处
《工业建筑》
CSCD
北大核心
2019年第6期99-106,共8页
Industrial Construction
基金
国家电网科技项目(5211JY17000M)
关键词
现场实测
风场特性
风压不均匀系数
档距折减系数
field measurements
wind field characteristics
non-uniform factor of wind pressure
span reduction factor
