Vortex induced response of bridge cables in turbulent flow

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F19%3A00509753" target="_blank" >RIV/68378297:_____/19:00509753 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Vortex induced response of bridge cables in turbulent flow

Popis výsledku v původním jazyce

Structural analysis related to the wind impact deals with the problems of static wind loading and dynamic excitation of structures, tall building, bridges, guyed masts, and towers. The wind causes naturally the static and/or dynamic effects on whole structure or on its parts, called substructures. The wind flow in the Atmospheric Boundary Layer is turbulent, which noticeably affects the creation of vortices and vortex shedding process. The size of the turbulent vortices and structure can be categorized as so called large- and small-scale turbulence. The main effect of small scale turbulence at the surface of the body is earlier reattachment of the flow through enhanced mixing in the shear layers. Roughness elements on the surface produce turbulence affecting bluff body boundary layer in close way as small-scale free-stream turbulence. Over the past years a large amount of researches has been devoted to research of vortex shedding in turbulent flows, see Miyata & Miyazaki, Kareem & Wu, Matteoni & Georgakis present results of vortex induced vibrations under simultaneous impact of the free stream turbulence and uniform roughness caused by emery cloth. Investigation of helical surface roughness effect at response and flow around cable-like structures was started by Votaw & Griffin, Couniah, Wadraw & Cooper etc. The peculiarity of this type of cables is that helical strands can act as suppressors of vortex shedding synchronization along the cable length, while the main parameters affecting this phenomenon are lay length and relative roughness k/D, where k is wire radius of outer layer of cable and D is cable diameter. In this experimental study were made efforts in the improvement of the methodology of the previous study, see Trush et al.

Název v anglickém jazyce

Vortex induced response of bridge cables in turbulent flow

Popis výsledku anglicky

Structural analysis related to the wind impact deals with the problems of static wind loading and dynamic excitation of structures, tall building, bridges, guyed masts, and towers. The wind causes naturally the static and/or dynamic effects on whole structure or on its parts, called substructures. The wind flow in the Atmospheric Boundary Layer is turbulent, which noticeably affects the creation of vortices and vortex shedding process. The size of the turbulent vortices and structure can be categorized as so called large- and small-scale turbulence. The main effect of small scale turbulence at the surface of the body is earlier reattachment of the flow through enhanced mixing in the shear layers. Roughness elements on the surface produce turbulence affecting bluff body boundary layer in close way as small-scale free-stream turbulence. Over the past years a large amount of researches has been devoted to research of vortex shedding in turbulent flows, see Miyata & Miyazaki, Kareem & Wu, Matteoni & Georgakis present results of vortex induced vibrations under simultaneous impact of the free stream turbulence and uniform roughness caused by emery cloth. Investigation of helical surface roughness effect at response and flow around cable-like structures was started by Votaw & Griffin, Couniah, Wadraw & Cooper etc. The peculiarity of this type of cables is that helical strands can act as suppressors of vortex shedding synchronization along the cable length, while the main parameters affecting this phenomenon are lay length and relative roughness k/D, where k is wire radius of outer layer of cable and D is cable diameter. In this experimental study were made efforts in the improvement of the methodology of the previous study, see Trush et al.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA19-04695S" target="_blank" >GA19-04695S: Aerodynamická odezva válce s povrchovou drsností v kritickém a přechodovém režimu Reynoldsova čísla</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů