Experimental investigation of galloping susceptibility of U beams with different flange porosity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F23%3A00556256" target="_blank" >RIV/68378297:_____/23:00556256 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/chapter/10.1007/978-3-030-93236-7_17" target="_blank" >https://link.springer.com/chapter/10.1007/978-3-030-93236-7_17</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Experimental investigation of galloping susceptibility of U beams with different flange porosity

Popis výsledku v původním jazyce

The paper presents the outcomes from the experimental investigation of the proneness of the set of slender U-beams to thentransversal galloping. All analysed beams are geometrically identical with the U-shaped cross section given by the sidenratio equal to 2 (having the short side perpendicular to the flow) and the depth equal to 1/3rd of its breadth, but they differnin the porosity of their flanges. The prisms with six different levels of flange porosity were subjected to wind tunnel testingnin the smooth flow in order to determine their aerodynamic drag and lift coefficients for various angles of wind attack. Thensusceptibility of each individual case was assessed based on the classical quasi-steady theory. Den Hartog criterionnexpressed in the form of the slope of transversal force coefficient incorporating obtained drag and lift coefficients wasnapplied. The significant positive slope indicating the proneness to transversal galloping was determined for U-beams withnporosity up to fifty percent. The prism with flange porosity of seventy five percent revealed as a practically stable due tonlow positive value of slope within only narrow angular interval around zero angle of wind attack. Finally, the beams withnhigher flange porosities can be considered according their negative slope of transverse force coefficient as stable in termsnof galloping. The comparison with the results from the aerodynamic tests of the prisms with rectangular cross-sectionsnhaving side rations equal to two and six, which represent limiting cases for analysed U-profiles, is also given and discussednin detail.

Název v anglickém jazyce

Experimental investigation of galloping susceptibility of U beams with different flange porosity

Popis výsledku anglicky

The paper presents the outcomes from the experimental investigation of the proneness of the set of slender U-beams to thentransversal galloping. All analysed beams are geometrically identical with the U-shaped cross section given by the sidenratio equal to 2 (having the short side perpendicular to the flow) and the depth equal to 1/3rd of its breadth, but they differnin the porosity of their flanges. The prisms with six different levels of flange porosity were subjected to wind tunnel testingnin the smooth flow in order to determine their aerodynamic drag and lift coefficients for various angles of wind attack. Thensusceptibility of each individual case was assessed based on the classical quasi-steady theory. Den Hartog criterionnexpressed in the form of the slope of transversal force coefficient incorporating obtained drag and lift coefficients wasnapplied. The significant positive slope indicating the proneness to transversal galloping was determined for U-beams withnporosity up to fifty percent. The prism with flange porosity of seventy five percent revealed as a practically stable due tonlow positive value of slope within only narrow angular interval around zero angle of wind attack. Finally, the beams withnhigher flange porosities can be considered according their negative slope of transverse force coefficient as stable in termsnof galloping. The comparison with the results from the aerodynamic tests of the prisms with rectangular cross-sectionsnhaving side rations equal to two and six, which represent limiting cases for analysed U-profiles, is also given and discussednin detail.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA19-21817S" target="_blank" >GA19-21817S: Neholonomní interakce a dynamická stabilita aeroelastických soustav</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

Lecture Notes in Civil Engineering

ISBN

978-3-030-93235-0

ISSN

2366-2557

e-ISSN

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Počet stran výsledku

7

Strana od-do

183-193

Název nakladatele

Springer

Místo vydání

Cham

Místo konání akce

Tokyo

Datum konání akce

17. 9. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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