|Table of Contents|

Effect of Geometric Parameters of Wind Fairing on Vortex-induced Vibration Performance of Two-side Box Type Π-shaped Girder(PDF)

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

Issue:
2022年05期
Page:
74-83
Research Field:
结构工程
Publishing date:

Info

Title:
Effect of Geometric Parameters of Wind Fairing on Vortex-induced Vibration Performance of Two-side Box Type Π-shaped Girder
Author(s):
LI Jia-wu1; 2;  XU Min-jian1; 2;  WANG Zi-jian1; 2; 3;  XING Song1; 2
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Wind Tunnel Laboratory, Chang'an University, Xi'an 710064, Shaanxi, China; 3. North China Municipal Engineering Design & Research Institute Co., Ltd., Tianjin 300074, China)
Keywords:
structural wind engineering;  two-side box type Π-shaped girder;  vortex-induced vibration;  wind fairing form;  wind tunnel test;  numerical simulation
PACS:
TU311.3
DOI:
10.19815/j.jace.2022.06030
Abstract:
In order to study the effect of geometric parameters of wind fairing on vortex-induced vibration(VIV)performance of two-side box type Π-shaped girder, 4 types of test combinations including the original section, which contain 14 test conditions were carried out. Through the segmental model vibration measurement test, the VIV amplitude of Π-shaped girder with test wind speed under different conditions were measured. The effects of different wind fairing lengths and tip heights on the VIV amplitude, the lock-in length and starting wind speed of two-side box type Π-shaped girder at 0° wind attack angle were analyzed. The SST k-ω model was used for computational fluid dynamics analysis. The flow field characteristics around the section of two-side box type Π-shaped girder under the original section and different wind fairing were simulated, and the VIV suppression mechanism of different wind fairing measures was discussed based on the evolution chart of static vorticity around flow. The results show that most wind fairing measures can effectively suppress the vertical bending VIV and reduce the torsional VIV amplitude of the two-side box type Π-shaped girder. When the ratio of tip height to girder height is 5/6, the vortex-induced vibration of the Π-shaped girder is completely suppressed and the VIV performance is good. Increasing the length of wind fairing and making the tip of wind fairing downward can help to reduce the VIV amplitude of the section and the lock-in length, and improve the starting wind speed, which can make the vibration suppression effect on the Π-shaped girder more obvious. The vortex-induced vibration is obvious in the original cross section of two-side box type Π-shaped girder. Installation of wind fairing can weaken the flow separation of upper surface gas and reduce the vortex scale, which is beneficial to suppress VIV. Periodic shedding and moving vortices on the lower surface of two-side box type Π-shaped girder are the driving factors of torsional vortex-induced vibration.

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Last Update: 2022-09-30