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Application of fluid viscous dampers to mitigate vibrations of high-speed railway bridges
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0002-1284-3641
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Tyréns.ORCID iD: 0000-0002-2908-4848
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Trafikverket.ORCID iD: 0000-0002-8926-2140
Tyréns.ORCID iD: 0000-0002-9260-1502
Show others and affiliations
2017 (English)In: International Journal of Rail transportation, ISSN 2324-8378, E-ISSN 2324-8386, Vol. 5, no 1, p. 47-62Article in journal (Refereed) Published
Abstract [en]

Several bridges along the Bothnia railway line in Sweden do not fulfil the Eurocode requirements regarding the maximum vertical bridge deck acceleration. The aim of this study is to investigate the possibility of reducing the acceleration of one of these bridges to an acceptable level by using post-installed viscous dampers. The bridge-damper system is described by a single-degree-of-freedom model. Assuming that the dampers do not change the mode shapes of the bridge, the model is further generalized to include higher order bending modes. The dampers are connected between the bottom surface of the bridge deck and the abutments.This creates an eccentricity between the connection point of the dampers and the neutral axis of the bridge, which is found to have a significant influence on the efficiency of the dampers. The results of this study also indicate that the proposed retrofit method can reduce the accelerations to an acceptable level.

Place, publisher, year, edition, pages
Abingdon, United Kingdom: Taylor & Francis Group, 2017. Vol. 5, no 1, p. 47-62
Keywords [en]
Structural dynamics; railway bridges; high-speed trains; resonance; passive damping; fluid viscous dampers
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-205653DOI: 10.1080/23248378.2016.1209444ISI: 000396621000004Scopus ID: 2-s2.0-8497848526OAI: oai:DiVA.org:kth-205653DiVA, id: diva2:1089930
Funder
Swedish Research Council Formas, 2010-1084
Note

QC 20170425

Available from: 2017-04-21 Created: 2017-04-21 Last updated: 2017-04-25Bibliographically approved
In thesis
1. Vibration mitigation of high-speed railway bridges: Application of fluid viscous dampers
Open this publication in new window or tab >>Vibration mitigation of high-speed railway bridges: Application of fluid viscous dampers
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

At the moment of writing, an expansion of the Swedish railway network has started, by constructions of new lines for high-speed trains. The aim is to create a high-speed connection between the most populous cities in Sweden - Stockholm, Göteborg and Malmö, and the rest of Europe. Thereby, the likelihood of faster, longer and heavier foreign trains crossing the Swedish lines is increased. However, this could be problematic since the dynamic response in railway bridges and, consequently, the risk of resonance increases with increasing train speeds.

Bridges are usually designed based on contemporary conditions and future requirements are rarely considered, due to e.g. cost issues. Prospectively, the dynamic performance of existing bridges may become insufficient. Hence, the current expansion of the high-speed railway network results in an increased demand of innovative design solutions for new bridges and cost-efficient upgrading methods for existing lines.

The aim of the present thesis is to propose a vibration mitigation strategy suitable for new and existing high-speed railway bridges. The main focus is a retrofit method with fluid viscous dampers installed between the bridge superstructure and the supports, which is intended to reduce the vertical bridge deck acceleration below the European design code limits. Furthermore, the intention is to investigate the efficiency of such a system, as well as to identify and analyse the parameters and uncertainties which could influence its functionality.

In order to examine the applicability of the proposed retrofit, case studies, statistical screenings and sensitivity analyses are performed and analysed. Two different models, a single-degree-of-freedom system and a finite element model, are developed and compared. From the different models, it is possible to study the influence from the damper parameters, the variability of the material properties and different modelling aspects on the bridge response. After the installation of the fluid viscous dampers, it is found that the acceleration level of the bridge deck is significantly reduced, even below the design code requirements.

Abstract [sv]

I skrivande stund har en utbyggnad av det svenska järnvägsnätet initierats. Målet är att skapa en höghastighetsanslutning mellan de folkrikaste städerna i Sverige - Stockholm, Göteborg och Malmö, och vidare ut i Europa. Därmed ökar sannolikheten att snabbare, längre och tyngre utländska tåg korsar de svenska järnvägslinjerna. Dock kan detta bli problematiskt i och med att järnvägsbroars dynamiska respons och, följaktligen, risken för resonans ökar med ökad tåghastighet.

Broar dimensioneras ofta utifrån nuvarande förutsättningar och hänsyn tas sällan till framtida hållbarhetskrav, exempelvis p.g.a. kostnadsbesparingar. Ur ett framtidsperspektiv kan därför det dynamiska beteendet hos befintliga broar komma att bli otillräckligt. Utbyggnaden av höghastighetsnätverket ökar därmed behovet av innovativa konstruktionslösningar för nya broar och kostnadseffektiva uppgraderingsmetoder för befintliga sträckor.

Syftet med föreliggande avhandling är att föreslå en metod för att minska de vibrationsnivåer som kan uppstå i både nybyggda och befintliga järnvägsbroar för höghastighetståg. Huvudfokus är en eftermonteringsmetod med viskösa dämpare, som har installerats mellan brons överbyggnad och landfästen, för att minska brobanans vertikala acceleration under gällande europeiska dimensioneringskrav. Vidare avses att undersöka effektiveteten av ett sådant system, samt att identifiera och analysera de parametrar och osäkerheter som kan påverka dess funktionalitet.

Fall- och parameterstudier, samt statistiska metoder används och utvärderas för att undersöka tillämpbarheten av den föreslagna vibrationsdämpningsmetoden. Två olika modeller, ett enfrihetsgradssystem och en finit elementmodell, har skapats och jämförts. Utifrån dessa modeller kan påverkan av dämparens parametrar, variabiliteten hos materialegenskaperna och behandlingen av olika modelleringsaspekter studeras. Från resultaten är det tydligt att brobanans accelerationsnivå avsevärt reduceras efter monteringen av viskösa dämpare, till och med under dimensioneringskraven.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 57
Series
TRITA-BKN. Bulletin, ISSN 1103-4270 ; 147
Keywords
dynamics, vibration mitigation, railway bridge, high-speed trains, bridge deck acceleration, passive damping, fluid viscous dampers, retrofit, dynamik, vibrationsdämpning, järnvägsbro, höghastighetståg, brobaneacceleration, passiv dämpning, viskösa dämpare, eftermontering
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-205672 (URN)978-91-7729-383-5 (ISBN)
Presentation
2017-05-17, M108, Brinellvägen 23, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council Formas, 2010-1084
Note

QC 20170425

Available from: 2017-04-25 Created: 2017-04-21 Last updated: 2017-04-25Bibliographically approved

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