Problems of lamella flanges in steel bridge construction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F15%3A00237804" target="_blank" >RIV/68407700:21110/15:00237804 - 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

Problems of lamella flanges in steel bridge construction

Popis výsledku v původním jazyce

Abstract. Lamella flanges have lately grown very popular with the designers of steel bridges, because – in their belief - they provide us with the possibility of avoiding very thick flange plates in steel bridge structures. This belief is based on the assumption that the lamellas are perfectly plane and, therefore, in perfect contact everywhere, so that the loading from one lamella is transmitted into the other via pure compression, and that the perfect interaction of both lamellas is materialized by means of boundary fillet welds connecting both of the two lamellas. This simple assumption is, however, far from reality: it is not in the means of steel fabricators, not even in the means of those which are very progressively equipped, to produce perfectly plane flange lamellas. Then both lamellas exhibit unavoidable initial curvatures, which in combination form a gap between the lamellas, and consequently the directly loaded lamella are pressed into this gap. As the loading acting on every bridge is many times repeated, the aforesaid phenomenon is also many times repeated, (we can say that the lamellas „breathe“), and then an unavoidable cumulative damage process in the lamellas comes to being. The authors studied this phenomenon using several methods, the most important among them being probably an experiment conducted on a model simulating the situation connected with the lamella flanges of a real bridge in the neighbourhood of Prague. The results of this investigation will be described in the paper and thereby will demonstrate that the fatigue phenomenon accompanying the “breathing“ of the lamellas can considerably limit the lifetime of the structure.

Název v anglickém jazyce

Problems of lamella flanges in steel bridge construction

Popis výsledku anglicky

Abstract. Lamella flanges have lately grown very popular with the designers of steel bridges, because – in their belief - they provide us with the possibility of avoiding very thick flange plates in steel bridge structures. This belief is based on the assumption that the lamellas are perfectly plane and, therefore, in perfect contact everywhere, so that the loading from one lamella is transmitted into the other via pure compression, and that the perfect interaction of both lamellas is materialized by means of boundary fillet welds connecting both of the two lamellas. This simple assumption is, however, far from reality: it is not in the means of steel fabricators, not even in the means of those which are very progressively equipped, to produce perfectly plane flange lamellas. Then both lamellas exhibit unavoidable initial curvatures, which in combination form a gap between the lamellas, and consequently the directly loaded lamella are pressed into this gap. As the loading acting on every bridge is many times repeated, the aforesaid phenomenon is also many times repeated, (we can say that the lamellas „breathe“), and then an unavoidable cumulative damage process in the lamellas comes to being. The authors studied this phenomenon using several methods, the most important among them being probably an experiment conducted on a model simulating the situation connected with the lamella flanges of a real bridge in the neighbourhood of Prague. The results of this investigation will be described in the paper and thereby will demonstrate that the fatigue phenomenon accompanying the “breathing“ of the lamellas can considerably limit the lifetime of the structure.

Druh

D - Stať ve sborníku

CEP obor

JM - Inženýrské stavitelství

OECD FORD obor

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Projekt

<a href="/cs/project/TE01020168" target="_blank" >TE01020168: Centrum pro efektivní a udržitelnou dopravní infrastrukturu (CESTI)</a><br>

Návaznosti

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

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název statě ve sborníku

Engineering mechanics 2015

ISBN

978-80-86246-42-0

ISSN

1805-8248

e-ISSN

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Počet stran výsledku

2

Strana od-do

164-165

Název nakladatele

Institute of Theoretical and Applied Mechanics Academy of Sciences of the Czech Republic

Místo vydání

Prague

Místo konání akce

Svratka

Datum konání akce

11. 5. 2015

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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