The Effect of Temperature Changes on Vertical Deflections of Metal Rail Bridge Constructions Determined by the Ground Based Radar Interferometry Method
Identifikátory výsledku
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>
Alternativní jazyky
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).
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
—
OECD FORD obor
20705 - Remote sensing
Návaznosti výsledku
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)
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
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
—