Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (8): 1826-1833.doi: 10.13229/j.cnki.jdxbgxb20210330

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Wind pressures on a circular hyperbolic⁃paraboloid roof subjected to a simulated downburst

Yun-peng CHU1(),Xin-hui SUN1(),Ming LI2,Yong YAO1,Han-jie HUANG2   

  1. 1.College of Civil Engineering and Architecture，Southwest University of Science and Technology，Mianyang 621010，China
    2.China Aerodynamics Research and Development Center，Mianyang 621010，China
  • Received:2021-04-15 Online:2022-08-01 Published:2022-08-12
  • Contact: Xin-hui SUN E-mail:chuyunpeng@swust.edu.cn;2451164146@qq.com

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Abstract:

A scale model of a large span structure with a circular hyperbolic-paraboloid roof was designed and made， and an impinging jet device was used to simulate the downburst. The test was designed to obtain the roof wind pressure coefficient and explore the influence of radial distance and wind direction angle on the wind pressure of circular hyperbolic-paraboloid roof. Then， by changing the width of the building， the oval hyperbolic-paraboloid roof was designed and made under the same conditions. The similarities and differences of wind pressure on the two roofs were compared and analyzed. The conclusions are as follows： ①The maximum wind pressure values of the high points diagonal of the circular hyperbolic-paraboloid roof first increase and then decrease with the increase of the radial distance. When the wind pressure is 1.25Djet， the wind pressure reaches the maximum， and the wind pressure coefficient is -0.81. ②Wind direction angle has a great influence on the wind pressure of low point areas of circular hyperbolic-paraboloid roof. When airflow frontal hits the low point area， the wind pressure on the windward area increases rapidly， and the change gradient of the wind pressure is very large. ③Due to the difference of lengths and widths， the wind pressure of the area which is 1/3L from roof center on high point line and the low point areas of the oval hyperbolic-paraboloid roof is slightly greater than that of the circular hyperbolic-paraboloid roof. These areas need to be strengthened during structural design.

Key words: structural engineering, downbrust, hyperbolic-paraboloid roof, wind tunnel test, wind pressure characteristics

CLC Number: 

  • TU312

Fig.1

Impact jet device"

Fig.2

Building models"

Fig.3

Vertical profiles comparison of downburst"

Fig.4

Average wind pressure of roof under different wind direction angles"

Fig.5

Distribution of wind pressure of roof when r≤0.75Djet"

Fig.6

Distribution of wind pressure of roof when r≥1.00Djet"

Fig.7

Curve of wind pressure coefficient when r≥1.00Djet"

Fig.8

Distribution of wind pressure of roof when r≤0.75Djet"

Fig.9

Curve of wind pressure coefficient under different wind direction angles"

Fig.10

Curve of wind pressure coefficient of HH' line of two different roofs under different radial distances"

Fig.11

Curve of wind pressure coefficient of LL' line of two different roofs under different radial distances"

Fig.12

Curve of wind pressure coefficient of HH' line of two different roofs under different wind direction angles"

Fig.13

Curve of wind pressure coefficient of LL' line of two different roofs under different wind direction angles"

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