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输电线风荷载规范方法的理论解析和计算比较研究

DOI: 10.13334/j.0258-8013.pcsee.2014.36.030, PP. 6613-6621

Keywords: 输电线,风荷载,规范,脉动效应

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Abstract:

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。

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