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Aerodynamic Instability of Stay Cables with Lighting Fixtures
https://orcid.org/http://orcid.org/0000-0001-9285-4940
https://orcid.org/http://orcid.org/0000-0001-9879-0626
In order to decorate the night view for cities, installing lighting fixtures on stay cables of existing cable-stayed bridges is an effective choice, but the aerodynamic characteristics of the stay cables will change significantly. This paper presents a study on the galloping stability of the stay cables equipped with lighting fixtures. The static aerodynamic coefficients were computed using computational fluid dynamics (CFD) simulations, and the reason for the negative slope of the lift coefficient was discussed based on the changes in pressure distributions and flow field characteristics. Wind tunnel tests were further carried out to verify the numerical results. The possible galloping instability intervals for the stay cables with lighting fixtures were calculated. The results show that the existence of lighting fixtures has significant effects on the aerodynamic performance of stay cables. The slope of the lift coefficient becomes negative within several intervals of angles of attack, which indicates the possible galloping instability. The sudden decrease in the lift coefficient is mainly related to the vortex which covers the concave between the lighting fixture and the stay cable and makes the separated flow cannot reattach.
Aerodynamic Instability of Stay Cables with Lighting Fixtures
https://orcid.org/http://orcid.org/0000-0001-9285-4940
https://orcid.org/http://orcid.org/0000-0001-9879-0626
In order to decorate the night view for cities, installing lighting fixtures on stay cables of existing cable-stayed bridges is an effective choice, but the aerodynamic characteristics of the stay cables will change significantly. This paper presents a study on the galloping stability of the stay cables equipped with lighting fixtures. The static aerodynamic coefficients were computed using computational fluid dynamics (CFD) simulations, and the reason for the negative slope of the lift coefficient was discussed based on the changes in pressure distributions and flow field characteristics. Wind tunnel tests were further carried out to verify the numerical results. The possible galloping instability intervals for the stay cables with lighting fixtures were calculated. The results show that the existence of lighting fixtures has significant effects on the aerodynamic performance of stay cables. The slope of the lift coefficient becomes negative within several intervals of angles of attack, which indicates the possible galloping instability. The sudden decrease in the lift coefficient is mainly related to the vortex which covers the concave between the lighting fixture and the stay cable and makes the separated flow cannot reattach.
Aerodynamic Instability of Stay Cables with Lighting Fixtures
https://orcid.org/http://orcid.org/0000-0001-9285-4940
https://orcid.org/http://orcid.org/0000-0001-9879-0626
In order to decorate the night view for cities, installing lighting fixtures on stay cables of existing cable-stayed bridges is an effective choice, but the aerodynamic characteristics of the stay cables will change significantly. This paper presents a study on the galloping stability of the stay cables equipped with lighting fixtures. The static aerodynamic coefficients were computed using computational fluid dynamics (CFD) simulations, and the reason for the negative slope of the lift coefficient was discussed based on the changes in pressure distributions and flow field characteristics. Wind tunnel tests were further carried out to verify the numerical results. The possible galloping instability intervals for the stay cables with lighting fixtures were calculated. The results show that the existence of lighting fixtures has significant effects on the aerodynamic performance of stay cables. The slope of the lift coefficient becomes negative within several intervals of angles of attack, which indicates the possible galloping instability. The sudden decrease in the lift coefficient is mainly related to the vortex which covers the concave between the lighting fixture and the stay cable and makes the separated flow cannot reattach.
Aerodynamic Instability of Stay Cables with Lighting Fixtures
KSCE J Civ Eng
Deng, Zhouquan (author) / Tang, Haojun (author) / Hu, Bo (author) / Li, Yongle (author)
KSCE Journal of Civil Engineering ; 25 ; 2508-2521
2021-07-01
14 pages
Article (Journal)
Electronic Resource
English
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