Introduction into bridge testing using a cogwheel load

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F23%3A00577317" target="_blank" >RIV/68378297:_____/23:00577317 - 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

Introduction into bridge testing using a cogwheel load

Popis výsledku v původním jazyce

A moving impulse load generated by a heavy polygonal wheel -the cogwheel (CW) - can be used on bridges as a testing excitation that combines static and dynamic loading. This recently proposed type of forced-vibration dynamic testing provides broadband excitation with a number of applications among which damage indication and the extraction of modal parameters have already been examined. Damage can be indicated by frequency changes measured during repeated CW passages across a bridge. Such a test requires no more than a few transducers mounted on the bridge and a traffic interruption of only a few minutes. Advantage can be also taken of the higher harmonics contained in the CW response. Modal parameters can be evaluated from the slow step-by-step movement of the CW. At least two accelerometers are required in order to evaluate the modal properties. One accelerometer (or more) is fixed at a chosen position on the bridge, while the other moves along with the CW which travels along a driving path across the bridge. The influence of the changing CW -mass position on the modal parameters can be theoretically eliminated in two suggested ways. The main advantages of this are that the process can be automated and that it can provide modal parameters based on a dense network of measurement points. An analytical structural-response solution to the CW load was achieved using a combination of ANSYS & MATLAB. As the solution of the moving CW is theoretically nonlinear due to the changing mass position, the applied approach together with its limiting conditions is explained. It applies the coupling equation together with modal decomposition and numerical integration. The approach is fitted for large finite element models and can be accomplished on a standard PC. The article summarizes experiences with CW experiments on a 4 m-long steel laboratory beam model including two vehicle models with variable polygonal wheels. Information about the first in-situ tests on a real footbridge will also be introduced shortly. Thus far, only a small amount of the information contained in the structural response to the CW could be efficiently utilised, and no semi-analytical approach has been attempted yet. This is a promising and economical testing technique for short and medium-sized bridges with potential application in commissioning of new bridges and assessment of ageing ones.

Název v anglickém jazyce

Introduction into bridge testing using a cogwheel load

Popis výsledku anglicky

A moving impulse load generated by a heavy polygonal wheel -the cogwheel (CW) - can be used on bridges as a testing excitation that combines static and dynamic loading. This recently proposed type of forced-vibration dynamic testing provides broadband excitation with a number of applications among which damage indication and the extraction of modal parameters have already been examined. Damage can be indicated by frequency changes measured during repeated CW passages across a bridge. Such a test requires no more than a few transducers mounted on the bridge and a traffic interruption of only a few minutes. Advantage can be also taken of the higher harmonics contained in the CW response. Modal parameters can be evaluated from the slow step-by-step movement of the CW. At least two accelerometers are required in order to evaluate the modal properties. One accelerometer (or more) is fixed at a chosen position on the bridge, while the other moves along with the CW which travels along a driving path across the bridge. The influence of the changing CW -mass position on the modal parameters can be theoretically eliminated in two suggested ways. The main advantages of this are that the process can be automated and that it can provide modal parameters based on a dense network of measurement points. An analytical structural-response solution to the CW load was achieved using a combination of ANSYS & MATLAB. As the solution of the moving CW is theoretically nonlinear due to the changing mass position, the applied approach together with its limiting conditions is explained. It applies the coupling equation together with modal decomposition and numerical integration. The approach is fitted for large finite element models and can be accomplished on a standard PC. The article summarizes experiences with CW experiments on a 4 m-long steel laboratory beam model including two vehicle models with variable polygonal wheels. Information about the first in-situ tests on a real footbridge will also be introduced shortly. Thus far, only a small amount of the information contained in the structural response to the CW could be efficiently utilised, and no semi-analytical approach has been attempted yet. This is a promising and economical testing technique for short and medium-sized bridges with potential application in commissioning of new bridges and assessment of ageing ones.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

International conference on health monitoring of civil & maritime structures . HeaMES 2023. Proceedings

ISBN

978-1-7394385-0-0

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

12-17

Název nakladatele

ASRANet

Místo vydání

Walton-on-Thames

Místo konání akce

London

Datum konání akce

12. 6. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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