Buckling and strength of prestressed steel stayed columns
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00333611" target="_blank" >RIV/68407700:21110/19:00333611 - isvavai.cz</a>
Výsledek na webu
<a href="http://hdl.handle.net/10467/86753" target="_blank" >http://hdl.handle.net/10467/86753</a>
DOI - Digital Object Identifier
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Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Buckling and strength of prestressed steel stayed columns
Popis výsledku v původním jazyce
Prestressed steel stayed columns have been used since fiftieth of the last century to en-hance their critical and maximal capacities in compression. This research deals with cen-tral steel tube columns, one and two tube crossarms and spatial prestressed rod or cable stays. Firstly four columns made of stainless steel 1.4301 with one central crossarm and cable stays were tested up to extreme buckling deflections. The following numerical anal-ysis employed geometrically and materially nonlinear analysis with imperfections (3D GMNIA) using ANSYS software. Careful analysis was successfully validated and used to obtain optimal prestressing of stays giving maximal critical loads and maximal collapse loads of the tested columns. All the following parametrical studies cover columns of the same geometrical and nonlinear material characteristics as given or resulted from testing. This enables comparison and evaluation of the significance concerning mode and value of initial deflections, value of prestressing, number of crossarms, material characteristics, sliding of stays at crossarms and ratios of maximal collapse to critical loads. The main re-sults concerning critical loads of an “ideal column” (with amplitudes of initial deflections L/500000) and maximal loads of an “imperfect column” (with amplitudes of initial deflec-tions L/200) under various prestressings of stays are discussed in a detail. In the conclu-sions a necessity of GNIA/GMNIA considering respective mode and value of initial de-flections is emphasized (linear buckling analysis is not sufficient in such prestressed ele-ments). Also the substantial significance of activating of stays during buckling and radical increase of both critical/maximal loads by adding the second crossarm is presented.
Název v anglickém jazyce
Buckling and strength of prestressed steel stayed columns
Popis výsledku anglicky
Prestressed steel stayed columns have been used since fiftieth of the last century to en-hance their critical and maximal capacities in compression. This research deals with cen-tral steel tube columns, one and two tube crossarms and spatial prestressed rod or cable stays. Firstly four columns made of stainless steel 1.4301 with one central crossarm and cable stays were tested up to extreme buckling deflections. The following numerical anal-ysis employed geometrically and materially nonlinear analysis with imperfections (3D GMNIA) using ANSYS software. Careful analysis was successfully validated and used to obtain optimal prestressing of stays giving maximal critical loads and maximal collapse loads of the tested columns. All the following parametrical studies cover columns of the same geometrical and nonlinear material characteristics as given or resulted from testing. This enables comparison and evaluation of the significance concerning mode and value of initial deflections, value of prestressing, number of crossarms, material characteristics, sliding of stays at crossarms and ratios of maximal collapse to critical loads. The main re-sults concerning critical loads of an “ideal column” (with amplitudes of initial deflections L/500000) and maximal loads of an “imperfect column” (with amplitudes of initial deflec-tions L/200) under various prestressings of stays are discussed in a detail. In the conclu-sions a necessity of GNIA/GMNIA considering respective mode and value of initial de-flections is emphasized (linear buckling analysis is not sufficient in such prestressed ele-ments). Also the substantial significance of activating of stays during buckling and radical increase of both critical/maximal loads by adding the second crossarm is presented.
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
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OECD FORD obor
20101 - Civil engineering
Návaznosti výsledku
Projekt
<a href="/cs/project/GA17-24769S" target="_blank" >GA17-24769S: Nelineární stabilita a pevnost štíhlých konstrukcí s nelineárními materiálovými vlastnostmi.</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
International Colloquium on Stability and Ductility of Steel Structures
ISBN
978-0-367-33503-8
ISSN
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e-ISSN
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Počet stran výsledku
8
Strana od-do
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Název nakladatele
ČVUT, Fakulta stavební, Katedra ocelových a dřevěných konstrukcí
Místo vydání
Praha
Místo konání akce
Praha
Datum konání akce
11. 9. 2019
Typ akce podle státní příslušnosti
WRD - Celosvětová akce
Kód UT WoS článku
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