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  • 1.
    Rådeström, Sarah
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Andersson, Andreas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Trafikverket.
    Mahir, Ülker-Kaustell
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Tyréns.
    Tell, Viktor
    Tyréns.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Structural control of high-speed railway bridges by means of fluid viscous dampers2016In: 19th IABSE Congress 2016, Zürich, Switzerland, 2016, p. 2535-2542Conference paper (Other academic)
    Abstract [en]

    The dynamic response of structures is an important aspect to consider, especially at resonance. Particularly, bridges traversed by trains are at risk, due to the repeated loading with regular interval from the axle and bogie spacings. If the risk of resonance is not accounted for in the design, the vertical acceleration of the bridge deck may exceed the allowed limits of comfort and safety. Hence, alternative, sustainable measures for reducing the vibrations in bridges are required to solve these challenges. This paper presents studies of fluid viscous dampers used to control the dynamic behaviour of high-speed railway bridges. A finite element model is used to investigate the response of an existing bridge, both prior to and after the installation of dampers, and the influence of some parameters on the efficiency of the dampers are analysed. The results from this paper show that the vertical deck acceleration is sufficiently reduced using the proposed solution.

  • 2.
    Rådeström, Sarah
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Mahir, Ülker-Kaustell
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Tyréns.
    Andersson, Andreas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Trafikverket.
    Tell, Viktor
    Tyréns.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Application of fluid viscous dampers to mitigate vibrations of high-speed railway bridges2017In: International Journal of Rail transportation, ISSN 2324-8378, E-ISSN 2324-8386, Vol. 5, no 1, p. 47-62Article in journal (Refereed)
    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.

  • 3.
    Rådeström, Sarah
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Tell, Viktor
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Department of Bridges, Tyréns AB, Stockholm, Sweden.
    Ülker Kaustell, Mahir
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Department of Bridges, Tyréns AB, Stockholm, Sweden.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Parametric evaluation of viscous damper retrofit for high-speed railway bridges2015Conference paper (Refereed)
    Abstract [en]

    Several of the bridges belonging to the Bothnia Line, located in northern Sweden, do not theoretically fulfil the current design limit for the vertical deck acceleration, when being subjected to high-speed trains. Hence, it is important to find appropriate vibration mitigation strategies that are applicable to railway bridges, in order to reduce the acceleration caused by passing trains. One way of solving this problem is to install external viscous dampers. A finite element solution for damper retrofit of high-speed railway bridges is proposed in this paper. The bridge is modelled as a two-dimensional Euler-Bernoulli beam, with inclined dashpots connected between the superstructure and the abutments. Furthermore, this paper highlights the influence of several parameters on the effectiveness of the dampers.

  • 4.
    Tell, Sarah
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Vibration mitigation of high-speed railway bridges: Application of fluid viscous dampers2017Licentiate 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.

  • 5.
    Tell, Sarah
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Leander, John
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Andersson, Andreas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Trafikverket.
    Mahir, Ülker-Kaustell
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Tyréns.
    Sensitivity analysis of a high-speed railway bridge with supplemental fluid viscous dampersManuscript (preprint) (Other academic)
    Abstract [en]

    One approach for upgrading existing high-speed bridges which are susceptible to excessive vibrations is to install damping devices. In this paper, a single-degree-of-freedom model of a simply-supported bridge with supplemental fluid viscous dampers installed between the superstructure and the abutments is derived based on an arbitrary mode of vibration. Further, to ensure the robustness of the proposed vibration mitigation method, a statistical screening of the uncertainties associated with the bridge-damper system is conducted using Monte-Carlo simulations. From this screening, it is possible to evaluate the probability of exceedance of a stipulated acceleration level, as well as studying the sensitivity of the ingoing random variables. This paper also highlights the necessity of conducting a statistical assessment to determine an estimate for the distribution of the acceleration limit and model uncertainty for dynamic analyses. The results also show that 1) the modulus of elasticity and structural damping should be treated as stochastic variables for the studied bridge, 2) it is sufficient to install damping devices only at the moveable bearing and 3) the proposed retrofit is insufficient if the friction of the moveable bearings is not overcome for the given set of damper parameters.

1 - 5 of 5
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