第38参第4期 2016年8月
土木建筑与环境工程
Journal of Civil,Architectural &.Environmental Engineering
doi;10. 11835/j.issn. 1674-4764. 2016. 04. 016
三边形梳杆风荷载谱模型试验研究
孙远，占冠元
（同济大学土木工程学院，上海200092）
Vol. 38 No. 4 Aug. 2016
摘要：对三边形格构式梳杆进行了均匀流和两种紊流下的高频测力天平风洞试验，得到了顺风向、横风向和扭转向的气动力系数以及脉动风荷载谱。采用基于风速谱的数学模型对顺风向脉动风荷载谱进行拟合，验证了该经验公式在不同流场下的造用性。根据试验所得横风向和扭转向脉动风荷载功率谱曲线的特点，建立由紊流激励和旋涡脱落激励两部分组成的谱函数数学模型，最小二乘法拟合结果与风洞试验结果吻合良好。横风向脉动风荷载请以紊流激励为主，紊流强度15%
时旋涡脱落激励贡献仅占10%，扭转向脉动风荷载谱中旋涡脱落激励贡献明显增大，达到40%。关键词：格构式梳杆；高频测力天平；风洞试验；风荷载谱；参数拟合
中图分类号：TU312
文献标志码：A
文章编号：1674-4764(2016)04-0108-07
Experimental investigationonthemathematical models of wind
load spectrumfortriangularlatticemast
SunYuan，ZhanGuanyuan
(College of Civil Engineering, Tongji University, Shanghai 200092, P. R. China)
Abstract: High frequency force balance test was conducted on triangular lattice mast and the along-wind, across-wind and torsional wind load spectra and mean force coefficients were obtained. The mathematical model based on the wind velocity function was used for the curve fitting of the along-wind load spectra and the applicability of the empirical formula in different flow fields was verified. Mathematical model consisted of turbulence and wake excitation was established for the across-wind load and torsional wind load according to the characteristics of the test spectra. Fitting results of least square method showed that the mathematical models were in good agreement with the test results.The contribution of turbulence excitation was dominant in across-wind load and the proportion of wake excitation was only 1o% when the turbulent intensity was 15 %. In torsional wind load the contribution of wake excitation increased obviously and accounted for about4o%.
Keywords:lattice mast; high frequency force balance; wind tunnel test; wind load spectrum parameter fitting
在风来流激励下，作用于单体结构上的风荷载可以分为顺风向、横风向和扭转向风荷载3类，目前对顺风向脉动风荷载和风振响应的研究比较成熟，
收稿日期：2016-01-10
而对于横风向和扭转向风荷载的研究还很不足，主要集中在对气动力谱的认识上。横风向脉动风荷载主要由横向紊流和旋涡脱落激励两部分组合而成，
作者简介：孙远（1990-），女，博士生，主要从事高算钢结构研究，（E-mail)2012sunyuan@tongji.edu.cn Received:2016-01-10
Author brief: Sun Yuan (1990-) , PhD candidate, main research interest: high-rise steel structure, (E-mail)2012sunyuan@
tongji. edu., cn.