500kV长江大跨越输电塔风振系数研究  

Study on Wind-induced Vibration Coefficients of the Transmission Tower in 500kV Long Span Line Crossing the Yangtze River

作　　者：杨风利 陈兵 许志勇 许奇 邵帅 YANG Fengli;CHEN Bing;XU Zhiyong;XU Qi;SHAO Shuai(China Electric Power Research Institute,Xicheng District,Beijing 100055,China;Construction Branch Corporation,State Grid Jiangsu Electric Power Corporation,Nanjing 210024,Jiangsu Province,China)

机构地区：[1]中国电力科学研究院有限公司,北京市西城区100055 [2]国网江苏省电力有限公司建设分公司,江苏省南京市210024

出　　处：《中国电机工程学报》2022年第7期2542-2555,共14页Proceedings of the CSEE

基　　金：国家电网有限公司科技项目(SGJSJSOOXMJS2000251)。

摘　　要：大风是大跨越输电塔设计的控制工况,而风振系数是跨越塔风荷载计算的重要参数。该文以在建的世界最高输电塔为研究对象,建立385m高、500kV大跨越输电塔的单塔和塔线耦合模型,通过模态分析计算单塔和塔线体系的动力特性。按照结构随机振动理论,推导了种典型风速谱下跨越塔共振响应分量的数学表达式,采用频域方法分析了风速谱类型、结构阻尼比、峰值因子、湍流积分尺度和脉动折减系数对跨越塔风振系数的影响规律。以Davenport风谱为目标谱,通过非线性时程分析计算跨越塔单塔和塔线体系的风振响应,基于有限元计算结果确定跨越塔各风压分段的风振系数和风振系数整塔加权值。将按照频域方法和时域方法得到的风振系数计算值与现行规范值进行对比分析,提出跨越塔风振系数计算方法和取值建议。Wind load is the control load case for design of long span crossing transmission tower. And wind vibration coefficient is one of the most important parameters for calculating wind loads acting on transmission towers. In this paper, the highest transmission tower in construction was selected as the investigated object. The single tower model and the tower-line model for the 385m high transmission tower of a 500kV long span crossing line were established. Dynamic characteristics based on the single tower model and the tower-line model were obtained by modal analysis. According to the structural random vibration theory, mathematical expressions of the resonant response term for the long span crossing transmission tower were derived corresponding to seven typical types of wind velocity spectrum. Effect analyses on wind vibration coefficient of long span crossing transmission tower were carried out by frequency-domain description. The effect parameters include wind velocity spectrum type, structural damping ratio, peak factor, turbulence scale as well as fluctuating reduction factor. The Davenport wind velocity spectrum was chosen as the target spectrum.Based on single tower model and tower-line model, the wind-induced vibration responses were calculated by nonlinear time history analysis. According to the FEA results, the wind vibration coefficients for different wind pressure segments as well as the weighted wind vibration coefficients of the long span crossing transmission tower were determined. The wind vibration coefficients by frequency-domain method and time history analysis were compared with the calculated values by the applicable standards. The calculation method and design values for wind vibration coefficients of long span crossing transmission tower were proposed.

关 键 词：大跨越 钢管塔 风速谱 塔线耦合 风振系数 

分 类 号：TM752[电气工程—电力系统及自动化]