输电线风荷载规范方法的理论解析和计算比较研究  

Theoretical Analysis and Comparison on Typical International Wind Load Codes of Transmission Conductors

作　　者：汪大海[1] 吴海洋[2] 梁枢果[3] 

机构地区：[1]武汉理工大学土木工程系,湖北省武汉市430070 [2]中南电力设计院,湖北省武汉市430071 [3]武汉大学风工程研究中心,湖北省武汉市430072

出　　处：《中国电机工程学报》2014年第36期6613-6621,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51478373)~~

摘　　要：中国时有输电线路的风灾破坏事故发生。作为一种典型的风振敏感结构,作用于杆塔结构上的输电线风荷载往往是线路设计中的控制荷载。从结构风工程原理出发,对中英美三国典型线路风荷载规范的理论基础、计算方法及取值原则做深入解析和比较,全面考察基本风速、风剖面、紊流度、空间相关性、随机脉动效应、档距及高度等因素对输电线风荷载计算的影响,逐步揭示了规范荷载差异的实质原因及分布规律。结合工程实例的计算比较,提出了在中国规范中优化平均风荷载计算参数,合理考虑风荷载空间相关性和紊流特性等主要脉动风动力效应因素的建议,为提高线路抗风设计的可靠性以及规范修订提供了一些客观参考。Damage and failure of transmission lines due to windstorm disaster have occurred accidentally in China in recent years. As a typical wind-sensitive structure, the wind load on long span lines is the controlling load case in transmission tower structure design. In this paper, based on wind engineering theories, considering the main influence of load factors, such as basic wind speed, wind profile, turbulence intensity, spatial correlation, turbulent dynamic effect, span and height of lines etc., the background methods and principles of the wind load calculation in China, America and British codes were investigated and compared comprehensively. Then, the distribution low of the differences between these design codes were revealed and discussed gradually. Furthermore, combined with the wind load calculation of a real engineering example follow these three codes, the suggestions about considering dynamic influence by the turbulence stochastic characteristics along the line span on the future revise of Chinese wind load codes were provided. The paper supplies some objective opinions for the specification revision. The conclusions and suggestions will benefit for codes revision and improve the reliability of wind resistance design for transmission system significantly.

关 键 词：输电线 风荷载 规范 脉动效应 

分 类 号：TU75[建筑科学—建筑技术科学]