论文部分内容阅读
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。
Wind-induced damage to transmission lines in China has occurred. As a typical wind-vibration-sensitive structure, the wind load acting on the tower structure is often the control load in the circuit design. Based on the theory of structural wind engineering, the theoretical basis, calculation method and principle of value of wind load of the typical routes of the three countries in the United Kingdom, Britain and the United States are analyzed and compared in depth. The basic wind speed, wind profile, turbulence, spatial correlation, Effect, span and height and other factors on the calculation of wind load on power transmission lines, and gradually revealed the real causes and distribution of load differences. Based on the calculation and comparison of engineering examples, some suggestions are put forward to optimize the calculation parameters of average wind load in Chinese norms, reasonably considering the main fluctuating wind dynamic factors such as wind load and turbulence characteristics, and to improve the reliability of line wind resistance design As well as some amendments to the standard provides some objective reference.