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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

34卷

期数:

2017年06期

页码:

77-84

栏目:

出版日期:

2017-11-30

文章信息/Info

Title:

Effects of Turbulence Parameters on Surface Average Wind Load of Rectangular Structure

作者:

白 桦，回城玉，刘健新

长安大学公路学院

Author(s):

BAI Hua, HUI Cheng-yu, LIU Jian-xin

School of Highway, Chang’an University

关键词:

风洞试验; 紊流强度; 紊流积分尺度; 风压; 体型系数

Keywords:

wind tunnel test;  turbulence intensity;  turbulence integral scale;  wind pressure;  body-form coefficient

分类号:

-

DOI:

-

文献标志码:

A

摘要:

为了得到风特性参数变化对结构表面风压分布的影响规律，在风洞中采用格栅紊流，分别形成了紊流强度相同但积分尺度不同与积分尺度相同但紊流强度不同的几种局部紊流风场，以此来研究紊流风特性参数对矩形结构表面风压分布规律的影响，并给出了考虑这些影响的修正公式。结果表明：紊流强度增大会使矩形结构表面正压区体型系数增大，负压区体型系数绝对值减小；正压区风压变化规律与结构尺度无关，负压区体型系数除了受来流紊流强度影响外，还存在明显的尺度效应；紊流积分尺度增大会使矩形结构表面体型系数绝对值也增大，但不同区域变化幅度没有规律，很难进行统一修正。

Abstract:

In order to obtain the laws about the effects of turbulent parameters on structural surface wind pressure distribution, the grid turbulence generators were used in wind tunnel to generate some identical turbulence intensities, different turbulence integral scale wind fields, and some different turbulence intensities, identical turbulence integral scale wind fields to study rectangular structural surface wind pressure distribution. Some correction formulas accounted for these influence were propounded. The results show that rectangular structural body-form coefficients in the positive pressure zone increase with the increasing of turbulence intensity, but the absolute values of the body-form coefficients in the negative pressure zone decrease. The change of wind pressure in the positive pressure zone has no relation with structural size. The body-form coefficients in the negative zone are influenced by not only turbulence intensity, but also structural size. With the rise of the turbulence integral scale, the absolute values of rectangular structure body-form coefficient increase, but the ranges of different regions are irregular and uniform correction is difficult.

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更新日期/Last Update: 2017-11-30