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Soil‐structure interaction for bridges with backwalls: FE‐analysis using PLAXIS
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Bro 2004, BV Bro and the Eurocodes give guidelines for how to consider earth pressure induced by change in temperature and braking forces when designing backwalls. In this thesis those demands are investigated using PLAXIS for evaluation of the earth pressure. The results show that the model in PLAXIS corresponds quite well with the conventions in Bro 2004 and that modelling in PLAXIS gives reliable results. The demand in Bro 2004 that backwalls always shall be designed for passive earth pressure has been found to be pessimistic. In case of long bridges and short backwalls passive earth pressure is most often reached but for shorter bridge lengths in combination with longer backwalls this is almost never the case. It was also found that PLAXIS is sensitive and that the structure of the model and the choice of input are essential. A model in PLAXIS doesn’t make the design more effective but it may be a good tool for analysing the effect of the earth pressure combined with other effects such as the patterns for displacement as well as moment- and force distributions.

Abstract [sv]

Bro 2004, BV Bro och Eurocode ger råd för hur jordtryck som uppkommer på grund av temperaturändring och bromskraft skall tas hänsyn till vid dimensionering av ändskärmar. I detta examensarbete undersöks dessa dimensioneringskrav med hjälp av PLAXIS för att göra en bedömning av jordtrycket. Resultaten visar att modellen i PLAXIS överensstämmer ganska väl med de konventioner som ges i Bro 2004 och att PLAXIS ger tillförlitliga resultat. Kravet att ändskärmar alltid ska dimensioneras för passivt jordtryck visade sig vara pessimistiskt. I fall med långa broar och korta ändskärmar nås ofta passivt jordtryck men för kortare broar med djupare ändskärmar är detta nästan aldrig fallet. PLAXIS visade sig vara känsligt för hur modellen byggs upp och vilka indata som ändvänds, varför dessa bör väljas försiktigt. En modell i PLAXIS medför inte en mer effektiv dimensionering men kan vara ett bra verktyg för analys av jordtryck i kombination med andra effekter så som förskjutningsmönster samt moment- och kraftdiagram.

Place, publisher, year, edition, pages
2008.
Series
Trita-BKN-Examensarbete, ISSN 1103-4297 ; 270
Keyword [en]
backwall, passive earth pressure, PLAXIS, interface coefficient
Keyword [sv]
ändskärm, passivt jordtryck, PLAXIS, gränsskikt
Identifiers
URN: urn:nbn:se:kth:diva-36798ISRN: KTH/BKN/Ex--270--SEOAI: oai:DiVA.org:kth-36798DiVA: diva2:431119
Subject / course
Structural Design and Bridges
Uppsok
Technology
Supervisors
Available from: 2011-08-16 Created: 2011-07-15 Last updated: 2011-08-16Bibliographically approved

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