基于修正的广义风荷载谱的输电塔架风振系数计算方法

本文分析并指出了《架空送电线路杆塔结构设计技术规定》(DL/T5154-2002)中关于计算输电塔风振系数条文中存在的问题,引进了基于输电塔气弹模型风洞试验数据得到的输电塔顺风向1阶广义风荷载谱模型,并对其进行了地貌和振型修正。详细推导了基于修正的输电塔1阶广义风荷载谱计算其风振系数的方法,采用该方法计算了某大跨越输电塔的风振系数,并且与基于准定常理论采用Daven-port谱和规范方法计算得到的风振系数进行比较,所得结论具有重要的参考价值,可以直接为输电线路工程设计提供借鉴。

The Method of Calculating the Gust Response Factors of Power Transmission Tower Based on the Revised Generalized Wind Power Spectrum

The problems existing in the items referred to calculating the gust response factors of power transmission tower in ＂Technical regulation of design for tower and pole structures of overhead transmission line＂ are pointed out and analyzed in this paper. A model of generalized wind power spectrum of power transmission tower in along-wind obtained by wind tunnel tests of nero-elastic model is introduced. The spectrum is revised according to different wind field categories and mode shapes. A method of calculating the gust response factors of power transmission tower based on the revised generalized wind power spectrum are recommended in detail. The gust response factors of a large span power transmission tower are calculated by the method introduced in this paper. The results are compared with that calculated based on the quasi-steady theory and Davenport wind power spectrum and that calculated according to the design code. Some important referable conclusions are summarized and supply references for design of power transmission tower.