|Table of Contents|

Study on Jensen number effect of wind load on square structure(PDF)

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

Issue:
2023年02期
Page:
105-115
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on Jensen number effect of wind load on square structure
Author(s):
BAI Hua;  YE Mao;  YANG Shiquan;  LIU Jianxin
(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
square structure;  wind tunnel test;  Jensen number;  wind load;  correlation
PACS:
TU317.1
DOI:
10.19815/j.jace.2021.09045
Abstract:
In order to understand the effect of the deviation of surface roughness on square structure wind load, two kinds of roughness index wind fields of A and B with different scale ratios were simulated in wind tunnel, and the Jensen number effect on the structural wind load when the Jensen number was 1 200 and 6 000 respectively was studied. The results show that the variation of the Jensen number has little influence on the mean wind load, while it has a greater influence on the fluctuating wind load. When the Jensen number is reduced from 6 000 to 1 200, the increase range of along-wind, cross-wind and torsional wind load is 200%-250%. With the decrease of the Jensen number, the energy of the wind load power spectrum increases slightly in low frequency, and decreases slightly in high frequency. The influence of the change of the Jensen number on the various types of wind load is relatively small, when there is an intersection angle between the flow direction and the straight edge of the square structure. The increase of Jensen number will reduce the correlation between along-wind direction, cross-wind direction and torsional wind load. The increase of the Jensen number from 1 200 to 6 000 imposes great effects on torsional wind load, which has a decrease of 63%, while the maximum decrease in across-wind load correlation is 40% and the maximum decrease in along-wind load is 15%. With the increase of the Jensen number, the frequency range of the along-wind load coherence function with the Davenport exponential attenuation increases, while vertical coherence function decreases in high frequency part.The vertical coherence function of cross-wind load and torsional wind load is more consistent with the Davenport exponential attenuation form.

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Last Update: 2023-03-20