Hidden safety in equilibrium verification of a steel bridge based on wind tunnel testing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00325380" target="_blank" >RIV/68407700:21110/19:00325380 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21610/19:00325380

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Hidden safety in equilibrium verification of a steel bridge based on wind tunnel testing

Popis výsledku v původním jazyce

The Cervena Bridge is a steel truss bridge built in the Czech Republic in 1886. The assessment by the partial factor method in Eurocodes reveals its insufficient reliability. In particular the bridge fails to satisfy the equilibrium limit state when strong wind occurs simultaneously with an unloaded train on the bridge. To avoid structural interventions or expensive traffic restrictions, a model of the bridge is tested in a wind tunnel to obtain force coefficients of wind pressure for the specific shape of the bridge and selected types of light-weight trains. The values of force coefficients based on wind tunnel tests correspond to 70–80% of those provided in EN 1991-1-4. Traffic flow records for the railway line under consideration are utilised to obtain distributions of weights and heights of light-weight trains. Detailed probabilistic analysis reveals that bridge reliability is close to the target level when the wind tunnel force coefficients are considered along with free-field wind and railway traffic records. It is shown that case-specific information may help to reduce numerous “hidden safeties” in reliability assessments, often included in the models for permanent actions and geometry, wind pressure, traffic load, and the combination of the last two.

Název v anglickém jazyce

Hidden safety in equilibrium verification of a steel bridge based on wind tunnel testing

Popis výsledku anglicky

The Cervena Bridge is a steel truss bridge built in the Czech Republic in 1886. The assessment by the partial factor method in Eurocodes reveals its insufficient reliability. In particular the bridge fails to satisfy the equilibrium limit state when strong wind occurs simultaneously with an unloaded train on the bridge. To avoid structural interventions or expensive traffic restrictions, a model of the bridge is tested in a wind tunnel to obtain force coefficients of wind pressure for the specific shape of the bridge and selected types of light-weight trains. The values of force coefficients based on wind tunnel tests correspond to 70–80% of those provided in EN 1991-1-4. Traffic flow records for the railway line under consideration are utilised to obtain distributions of weights and heights of light-weight trains. Detailed probabilistic analysis reveals that bridge reliability is close to the target level when the wind tunnel force coefficients are considered along with free-field wind and railway traffic records. It is shown that case-specific information may help to reduce numerous “hidden safeties” in reliability assessments, often included in the models for permanent actions and geometry, wind pressure, traffic load, and the combination of the last two.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

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

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Life-Cycle Analysis and Assessment in Civil Engineering. Towards an Integrated Vision

ISBN

978-1-138-62633-1

ISSN

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e-ISSN

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Počet stran výsledku

7

Strana od-do

307-313

Název nakladatele

Taylor & Francis/Balkema

Místo vydání

Leiden

Místo konání akce

Ghent

Datum konání akce

28. 10. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000471120400036