Study of three-dimensional distortion effect of turbulence on lateral buffeting force acting on a 2∶ 1 rectangular cylinder and wind tunnel correction method

被引：0
|
作者：
Li S. [1 ,2 ]
Liao Z. [1 ,2 ]
Li X. [1 ,2 ]
Li Z. [1 ,2 ]
Su Y. [1 ,2 ]
机构：
[1] School of Civil Engineering, Chongqing University, Chongqing
[2] Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 05期
关键词：
lateral buffeting force; rectangular cylinder; scale effect of turbulence; three-dimensional aerodynamic admittance; wind tunnel test;
D O I：
10.14006/j.jzjgxb.2022.0599
中图分类号：
学科分类号：
摘要：
In order to study the scale effect of turbulence on the buffeting force on a bluff body, pressure measurements on a rigid sectional model were conducted in the wind tunnel. The emphasis was placed on investigating the effect of integral length scale of turbulence on the spanwise correlation and spatial distribution of lateral buffeting force on a rectangular cylinder with an aspect ratio 2∶ 1. It is observed that the spanwise correlation of the lateral buffeting force became larger than that of the turbulence when the turbulence scale is similar to the characteristic dimension of the bluff body, indicating a more significant three-dimensional effect of turbulence. Meanwhile, it should be noted that the scale effect caused by the turbulence scale has a significant impact on the spectrum and aerodynamic admittance (AAF) of the lateral buffeting force. To study the mechanism of this effect, a closed-form model of three-dimensional aerodynamic admittance was proposed. This model was expressed in terms of the two-dimensional aerodynamic admittance (2D AAF) in fully correlated turbulence and the corresponding spanwise correction factor. The former can be adopted to describe the distortion effect of turbulence, and the latter was used to correct the three-dimensional effect of turbulence. The test results show that the three-dimensional effect and distortion effect would lead to underestimation of the gust-loading in low- and high-frequency domains when the scale effect becomes more prominent, which may cause an unsafe wind-resistant design of the structure. Based on wind tunnel tests, an empirical model of two-dimensional aerodynamic admittance was proposed to accurately describe the drop-off property of buffeting loading at high-frequency domain(reduced frequency is greater than 1). © 2023 Science Press. All rights reserved.
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页码：68 / 77
页数：9
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