Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (3): 615-625.doi: 10.13229/j.cnki.jdxbgxb20200855

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Wind load characteristics of double⁃sided spherical shell roof under downburst

Yong YAO1,2(),Liu-feng SU1(),Ming LI3,Yun-peng CHU1,Han-jie HUANG3   

  1. 1.School of Civil Engineering and Architecture，Southwest University of Science and Technology，Mianyang 621000，China
    2.Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province，Southwest University of Science and Technology，Mianyang 621000，China
    3.China Aerodynamics Research and Development Center，Mianyang 621000，China
  • Received:2020-11-06 Online:2022-03-01 Published:2022-03-08
  • Contact: Liu-feng SU E-mail:yy001221@163.com;344107296@qq.com

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Abstract:

To study the wind pressure distribution characteristics of double-sided spherical shell roofs in flat and sloping terrain under the action of downbursts， a rigid scale model was made based on the similarity criterion. Through wind tunnel tests， the influence of the change of the flow field position of the model in the two terrains on the distribution of the average wind pressure coefficient of the roof and the position and value of the maximum and minimum values are studied. The results show that as the radial distance increases， the average wind pressure coefficient on the windward side of the upper roof changes from positive to negative， and the maximum negative value appears at the edge of the windward surface. The value of the face-on average wind pressure coefficient of the lower roof gradually decreases， but always remains positive. As the radial distance increases， the average wind pressure coefficient of the upper roof is always negative and the negative value gradually increases. The average wind pressure coefficient on the windward side of the lower roof changes from positive to negative， and the maximum negative value appears at the edge of the windward side. The location of the model in the wind field and the different topographic conditions have great influences on wind pressure distribution characteristics which include the positive and negative wind pressure transitions of the upper and lower roofs and the location of the extreme wind pressure and its numerical values.

Key words: structural engineering, downbrust, different topography, double-sided spherical shell roof, wind tunnel test, wind pressure characteristic

CLC Number: 

  • TU312

Fig.1

Downburst experimental device"

Fig.2

Curve of average wind velocity with height"

Fig.3

Vertical profile comparison ofdownburst wind field"

Fig.4

Schematic diagram of double-sided spherical shell model and arrangement of measuring points"

Fig.5

Schematic diagram of position of flatworking condition model"

Fig.6

Wind pressure distribution of the model roof when the nozzle is directly below"

Fig.7

Wind pressure distribution of upper roofon model under various workingconditions of flat ground"

Fig.8

Variation curve of wind pressure coefficient of upper roof centerline on flat ground"

Fig.9

Wind pressure distribution of lower roof on model under various working conditions offlat ground"

Fig.10

Variation curve of wind pressure coefficient of lower roof centerline on flat ground"

Fig.11

Schematic diagram of the position of each working condition model on the slope"

Fig.12

Wind pressure distribution of upper roof on Model under various working conditions of slope ground"

Fig.13

Variation curve of wind pressure coefficient of upper roof centerline on slope ground"

Fig.14

Wind pressure distribution of lower roof on model under various working conditions of slope ground"

Fig.15

Variation curve of wind pressure coefficient of lower roof centerline on slope ground"

Fig.16

Wind pressure comparison curve of upper roof centerline on two kinds of terrain"

Fig.17

Wind pressure comparison curve of lower roof centerline on two kinds of terrain"

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