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A theoretical study of the variation in the modal properties of a road bridge exposed to scour
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Bro- och stålbyggnad.
2019 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

With the advent of climate change witnessed in past decades, consequences havebeen felt globally. One of short term effects from climate change includes theincrease of weather disasters and changes in the frequency of extreme events,which can cause heavier precipitation and increased risk of land sliding anderosion. One particular type of erosion is scour, in which soil material is removedfrom around a foundation caused by the action of water and it is known to to beone of the most predominant causes of bridge failure.Once soil is removed around the bridge pier, change in boundary conditions mayoccur, which could possibly lead to a change in the flexibility of the foundationand the stiffness and damping of the whole structure may alter.The analysis of the existing bridge was done through the construction of aFE model, in which springs and dampers were introduced to represent thefoundation. The stiffness and damping coefficient of those elements weredetermined trough impedance functions obtained from soil-structure interactionanalysis.The present project has shown that a possible noticeable change is expected tohappen in the first, third, fourth and sixth bridge’s natural frequencies, whichcould be used as a guideline on where to position accelerometers for possible fieldtests and measurements. Also, the study evidenced that deep level of scour isneeded in order to identify changes in the eigenfrequency.

sted, utgiver, år, opplag, sider
2019.
Serie
TRITA-ABE-MBT ; 19650
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-259898OAI: oai:DiVA.org:kth-259898DiVA, id: diva2:1353524
Veileder
Examiner
Tilgjengelig fra: 2019-09-23 Laget: 2019-09-23

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