三边形桅杆杆身风荷载特性风洞试验研究

发布时间：2018-07-26 07:53

【摘要】：应用高频测力天平技术,分别对有附属结构和无附属结构的三边形桅杆杆身进行了均匀流和两种紊流下的风洞试验,得到了桅杆的平均风力系数、均方根力系数和顺风向、横风向及扭转向风荷载谱.分析了雷诺数、紊流度、风向角、附属结构等对风荷载系数的影响,对比了试验体型系数和不同国家规范关于桅杆及其附属结构体型系数的规定.谱分析结果表明,顺风向风荷载谱和脉动风速谱的基本特征相同,横风向、扭转向风荷载谱主要由低频部分的紊流激励谱和高频部分的旋涡脱落激励谱组成,无附属结构模型旋涡脱落谱有一个峰,峰值折减频率在1.8左右,带附属结构模型在90°风向角下出现两个明显的旋涡脱落谱峰,峰值折减频率分别在0.9和2.2左右,探讨了格构式塔架旋涡脱落谱的特性以及附属结构对其的影响机理.
[Abstract]:By using the technique of high-frequency force balance, the wind tunnel tests of trilateral mast with and without auxiliary structure were carried out under uniform flow and two kinds of turbulent flow, respectively. The average wind force coefficient, root mean square force coefficient and wind direction of the mast were obtained. Cross wind and torsional wind load spectrum. The effects of Reynolds number, turbulence degree, wind direction angle and auxiliary structure on the wind load coefficient are analyzed, and the comparison between the test shape coefficient and the provisions of different national codes on the shape coefficient of the mast and its auxiliary structure is made. The results of spectral analysis show that the basic characteristics of downwind load spectrum and pulsating wind velocity spectrum are the same. The transverse wind direction and torsional wind load spectrum are mainly composed of the turbulent excitation spectrum of the low frequency part and the vortex shedding excitation spectrum of the high frequency part. There is a peak of vortex shedding spectrum in unattached structure model, and the peak reduction frequency is about 1.8. Two obvious vortex shedding spectrum peaks appear in the model with attached structure at 90 掳wind direction angle, and the peak reduction frequency is about 0.9 and 2.2, respectively. The characteristics of vortex shedding spectrum of lattice tower and the influence mechanism of attached structure on it are discussed.
【作者单位】：同济大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378381)~~
【分类号】：TU312.1

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