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Statements

Subject Item
n2:RIV%2F68407700%3A21110%2F14%3A00224395%21RIV15-TA0-21110___
rdf:type
skos:Concept n21:Vysledek
rdfs:seeAlso
http://paginas.fe.up.pt/~eurodyn2014/CD/papers/359_MS13_ABS_1111.pdf
dcterms:description
In the last two decades, the Czech Republic has been hit by great floods, causing damage on many bridges. An important question, whether the bridge has to be demolished, or can be used under certain operating conditions, often arises. The investigated footbridge across the Bečva River in Přerov was built in 1983. During the extreme flooding the footbridge deck was overflowed by water, which caused a significant increase of the main span permanent deflection, about 1 m in the vertical direction compared to the state before flooding. The footbridge was closed for all users immediately. During the assessment of the footbridge structural integrity, it was decided to carry out an experimental modal analysis of the structure. The results of the modal analysis were compared with the results obtained on the footbridge in 1983. It was found that the dynamic behavior of the footbridge changed significantly. Especially, the basic natural mode has totally changed its shape. Finally, the measured modal characteristics were compared with the values provided by the Finite Element (FE) model. The comparison confirmed that the big changes in natural mode shapes were caused by the increase of the permanent deflection of the footbridge. The agreement between the newly measured and calculated natural mode shapes was high, however, small differences were found out and two suspicious areas were detected. The behavior of the real structure in these areas was different from the model predictions, and their detailed investigation was recommended because of a possible damage. One of these areas was located in the vicinity of the supporting pier. The experimental analysis revealed bigger flexibility of the pier in the horizontal transversal direction than the FE model predicted. The consequent inspection of the footbridge revealed a crack in the area of the concrete hinge joint. In the last two decades, the Czech Republic has been hit by great floods, causing damage on many bridges. An important question, whether the bridge has to be demolished, or can be used under certain operating conditions, often arises. The investigated footbridge across the Bečva River in Přerov was built in 1983. During the extreme flooding the footbridge deck was overflowed by water, which caused a significant increase of the main span permanent deflection, about 1 m in the vertical direction compared to the state before flooding. The footbridge was closed for all users immediately. During the assessment of the footbridge structural integrity, it was decided to carry out an experimental modal analysis of the structure. The results of the modal analysis were compared with the results obtained on the footbridge in 1983. It was found that the dynamic behavior of the footbridge changed significantly. Especially, the basic natural mode has totally changed its shape. Finally, the measured modal characteristics were compared with the values provided by the Finite Element (FE) model. The comparison confirmed that the big changes in natural mode shapes were caused by the increase of the permanent deflection of the footbridge. The agreement between the newly measured and calculated natural mode shapes was high, however, small differences were found out and two suspicious areas were detected. The behavior of the real structure in these areas was different from the model predictions, and their detailed investigation was recommended because of a possible damage. One of these areas was located in the vicinity of the supporting pier. The experimental analysis revealed bigger flexibility of the pier in the horizontal transversal direction than the FE model predicted. The consequent inspection of the footbridge revealed a crack in the area of the concrete hinge joint.
dcterms:title
Modal Analysis of a Footbridge Damaged by Flood Modal Analysis of a Footbridge Damaged by Flood
skos:prefLabel
Modal Analysis of a Footbridge Damaged by Flood Modal Analysis of a Footbridge Damaged by Flood
skos:notation
RIV/68407700:21110/14:00224395!RIV15-TA0-21110___
n4:aktivita
n18:P
n4:aktivity
P(TE01020168)
n4:dodaniDat
n12:2015
n4:domaciTvurceVysledku
n6:6452833 n6:9321403
n4:druhVysledku
n9:D
n4:duvernostUdaju
n20:S
n4:entitaPredkladatele
n7:predkladatel
n4:idSjednocenehoVysledku
29689
n4:idVysledku
RIV/68407700:21110/14:00224395
n4:jazykVysledku
n10:eng
n4:klicovaSlova
Modal Analysis; Footbridge; Damage detection; Bridge dynamics; Natural frequencies; Mode shapes
n4:klicoveSlovo
n5:Mode%20shapes n5:Footbridge n5:Modal%20Analysis n5:Natural%20frequencies n5:Bridge%20dynamics n5:Damage%20detection
n4:kontrolniKodProRIV
[65F28C36ACCE]
n4:mistoKonaniAkce
Porto
n4:mistoVydani
Porto
n4:nazevZdroje
Proceedings of the IX International Conference on Structural Dynamics, EURODYN2014
n4:obor
n8:JM
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
3
n4:projekt
n22:TE01020168
n4:rokUplatneniVysledku
n12:2014
n4:tvurceVysledku
Karásek, P. Plachý, Tomáš Polák, Michal
n4:typAkce
n14:WRD
n4:zahajeniAkce
2014-06-30+02:00
s:issn
2311-9020
s:numberOfPages
8
n15:hasPublisher
Faculdade de Engenharia da Universidade do Porto
n17:isbn
978-972-752-165-4
n19:organizacniJednotka
21110