峡谷复杂地形风场空间分布特性试验研究

张玥1,唐金旺1,周敉2,高亮3

振动与冲击 ›› 2016, Vol. 35 ›› Issue (12) : 35-40.

PDF(2147 KB)
PDF(2147 KB)
振动与冲击 ›› 2016, Vol. 35 ›› Issue (12) : 35-40.
论文

峡谷复杂地形风场空间分布特性试验研究

  • 张玥1,唐金旺1,周敉2,高亮3
作者信息 +

Experimental Research on the Spatial Distribution Characteristics of   Wind Field in Valley Terrain

  • Zhang Yue1,Tang Jin-wang1,Zhou Mi2,Gao Liang3
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文章历史 +

摘要

山区峡谷地貌复杂,风场参数确定是桥梁设计面临的突出问题,而现有桥梁抗风规范缺乏对此类地形条件的描述。以某实桥作为工程背景,进行了桥址区峡谷地形风洞试验研究。根据试验数据分析了峡谷复杂地形下不同风向的平均风和脉动风特性,并基于气象站历史风速记录和规范风速标准,总结了以梯度风高度及基本风压推算桥址区基本风速的方法。试验结果表明:桥址峡谷地带,无明显峡谷风效应,平均风剖面分布不能依据统一形式描述;拟合得到桥址桥面高度处风速剖面指数α=0.20,地表类型归为C类;顺着峡谷中心来流,湍流强度值明显小于其它来流;与理论曲线相比,实测风速功率谱在低频段偏低而高频段略微偏高;随着风向角增大,水平脉动风速谱向高频段偏移。

Abstract

Landscape in mountainous-valley is complex. Determining the parameters of the wind field is a prominent problem in the design of the bridge. However the existing wind-resistant specification for bridges lacks descriptions as terrain conditions. Based on a real bridge as the engineering background,it carries out a wind tunnel test on the valley of the bridge site. According to the test data,the average wind and fluctuating wind characteristics of different wind directions are analyzed. On the basis of historical wind speed record on the weather station and wind speed standard in specification,the method of calculating basic wind speed at the bridge site area with the gradient wind height and t basic wind pressure is summarized. The experiment results prove that there is no obvious valley-wind effect in bridge site and the mean wind profile cannot be simulated as a uniform. The wind profile exponent is α=0.20 which type of surface is classified into C. Turbulence intensity of the flow down valley center is significantly smaller than others. The measured wind power spectrum compared with the theoretical curve is lower in low frequency and higher in high frequency,its horizontal turbulence power spectrum will shift to high frequency along with the increase of wind direction.
 
 

关键词

山区峡谷 / 桥梁工程 / 风特性参数 / 地形模型 / 风洞试验 / 基本风速

Key words

mountain valley;bridge engineering;wind characteristic parameters;terrain-model;wind tunnel test;basic wind speed  /   /  

引用本文

导出引用
张玥1,唐金旺1,周敉2,高亮3 . 峡谷复杂地形风场空间分布特性试验研究[J]. 振动与冲击, 2016, 35(12): 35-40
Zhang Yue1,Tang Jin-wang1,Zhou Mi2,Gao Liang3. Experimental Research on the Spatial Distribution Characteristics of   Wind Field in Valley Terrain[J]. Journal of Vibration and Shock, 2016, 35(12): 35-40

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