The Effect of Temperature Changes on Vertical Deflections of Metal Rail Bridge Constructions Determined by the Ground Based Radar Interferometry Method

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985556%3A_____%2F19%3A00522476" target="_blank" >RIV/67985556:_____/19:00522476 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1755-1315/221/1/012076" target="_blank" >http://dx.doi.org/10.1088/1755-1315/221/1/012076</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1755-1315/221/1/012076" target="_blank" >10.1088/1755-1315/221/1/012076</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Effect of Temperature Changes on Vertical Deflections of Metal Rail Bridge Constructions Determined by the Ground Based Radar Interferometry Method

Popis výsledku v původním jazyce

The paper describes possibilities of the relative new technique – ground based radar interferometry for precise determining of the effect of temperature changes on verticalndeflections of metal bridge structures. The ground based radar interferometry method is used in practice, among other things, for the quick contactless determination of vertical deflections of metallic railway bridge structures. The precision in deflection determination is up to 0.01 mm in real time. At the same time, it is also possible to capture and analyze the oscillation frequencies of the monitored object with a maximum frequency of up to 50 Hz. Deflections are determined at multiple points of the object at the same time, for example on individual cross beams. This allows to obtain both general and detailed information about the behaviour of the structure under its dynamic load and to monitor the impact of vehicle passages or their groups. Moreover, the ground based radar interferometry method is not sensitive to temperature changes. It can therefore to be used successfully to determine the effect of temperature changes on deflections and deformations of metallic objects, such as bridge structures. The influence of temperature changes is of two kinds. First, a direct effect on the very structure causes deformations due to thermal expansion of the metallic material. Furthermore, it is the effect on the character of the dynamic deformations caused by load changes - the transit of vehicles. This character varies with temperature, as demonstrated by experimental measurement in practice. Practical examples from practice documented by experimental measurements are given in the article. For example, at a 75m long metal bridge over a six-hour period with a temperature change of 25°C, a vertical deflection - lifting the bridge deck was about 9.5mm due to the thermal expansion of the material. There has been also a change in the nature of the dynamic deflections caused by train passes. At low night temperatures (about 14°C), deflections were much smoother than at high afternoon temperatures (about 39°C).

Název v anglickém jazyce

The Effect of Temperature Changes on Vertical Deflections of Metal Rail Bridge Constructions Determined by the Ground Based Radar Interferometry Method

Popis výsledku anglicky

The paper describes possibilities of the relative new technique – ground based radar interferometry for precise determining of the effect of temperature changes on verticalndeflections of metal bridge structures. The ground based radar interferometry method is used in practice, among other things, for the quick contactless determination of vertical deflections of metallic railway bridge structures. The precision in deflection determination is up to 0.01 mm in real time. At the same time, it is also possible to capture and analyze the oscillation frequencies of the monitored object with a maximum frequency of up to 50 Hz. Deflections are determined at multiple points of the object at the same time, for example on individual cross beams. This allows to obtain both general and detailed information about the behaviour of the structure under its dynamic load and to monitor the impact of vehicle passages or their groups. Moreover, the ground based radar interferometry method is not sensitive to temperature changes. It can therefore to be used successfully to determine the effect of temperature changes on deflections and deformations of metallic objects, such as bridge structures. The influence of temperature changes is of two kinds. First, a direct effect on the very structure causes deformations due to thermal expansion of the metallic material. Furthermore, it is the effect on the character of the dynamic deformations caused by load changes - the transit of vehicles. This character varies with temperature, as demonstrated by experimental measurement in practice. Practical examples from practice documented by experimental measurements are given in the article. For example, at a 75m long metal bridge over a six-hour period with a temperature change of 25°C, a vertical deflection - lifting the bridge deck was about 9.5mm due to the thermal expansion of the material. There has been also a change in the nature of the dynamic deflections caused by train passes. At low night temperatures (about 14°C), deflections were much smoother than at high afternoon temperatures (about 39°C).

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20705 - Remote sensing

Projekt

<a href="/cs/project/FR-TI4%2F436" target="_blank" >FR-TI4/436: Výzkum možností pozemního InSAR pro určování deformací rizikových objektů a lokalit</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

World Multidisciplinary Earth Sciences Symposium (WMESS 2018)

ISBN

—

ISSN

1755-1307

e-ISSN

1755-1315

Počet stran výsledku

10

Strana od-do

012076

Název nakladatele

IOPscience

Místo vydání

Bristol

Místo konání akce

Praha

Datum konání akce

3. 9. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—