Dynamical identification and modelling of steel–concrete composite high-speed railway bridges

Chellini, Giuseppe; Guarda-Nardini, Luca; Salvatore, Walter

doi:10.1080/15732470903017240

Cited by 33 publications

(15 citation statements)

References 3 publications

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“…In a first approach the additional damping introduced by the track elements is therefore neglected, which is also in accordance with previous works [5,11,12]. The modal damping obtained in the experimental campaign was assigned to the paired numerical modes, for the other modes of frequencies up to 30 Hz a value of 1.56% is assumed (Eurocode value [1]).…”

Section: Bridge Response Under Railway Trafficmentioning

confidence: 73%

“…Regarding the comparison between the response predicted by the three numerical approaches, it is noticeable that the model that considers both the longitudinal and transverse coupling between decks (DDDS model) predicts the frequency contributions in the range [10][11][12][13][14][15] Hz with higher accuracy, but the three of them overestimate the contribution of the fundamental mode in the response. The authors consider that the additional damping induced by the track elements, that is neglected in this preliminary study and also the effect of the train-bridge interaction, could be responsible of the differences and needs to be investigated in a future work.…”

Section: Bridge Response Under Railway Trafficmentioning

confidence: 99%

“…Previous studies apply this technique, therefore neglecting the damping introduced by the track elements at discrete positions but including global damping ratios instead. [5,11,12] In this contribution, the dynamic behavior of multi-span SS bridges formed by structurally independent single-track decks at each span is investigated, in order to evaluate the effect of the continuity of the ballasted track on the vertical acceleration response under train-induced vibrations. As the object of study, a bridge belonging to the spanish railway network is used, which is described in Section 2.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vertical Coupling Effect of the Ballasted Track on the Dynamic Behavior of Multitrack Railway Bridges Composed by Adjacent Decks

Moliner¹,

Romero²,

Quesada³

et al. 2020

XI International Conference on Structural Dynamics

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Section: Bridge Response Under Railway Trafficmentioning

confidence: 73%

Section: Bridge Response Under Railway Trafficmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vertical Coupling Effect of the Ballasted Track on the Dynamic Behavior of Multitrack Railway Bridges Composed by Adjacent Decks

Moliner¹,

Romero²,

Quesada³

et al. 2020

XI International Conference on Structural Dynamics

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“…Continuous track models permit considering the composite action between the track and the bridge associated to the transmission of shear stress between the deck and the rails through the ballast. In these models, the ballast is generally represented as a continuum and is discretised into solid FE [24][25][26], admitting elastic and isotropic constant material properties. Additionally, in the ballast regions located at the joints between consecutive spans or decks, a few researchers propose the use of degraded material properties to take into account the possible loss of stiffness of the ballast due to the cyclic movement caused by passing trains [27,28].…”

Section: Introductionmentioning

confidence: 99%

Ballasted track interaction effects in railway bridges with simply-supported spans composed by adjacent twin single-track decks

Quesada

Moliner

Romero

et al. 2021

Engineering Structures

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This paper is devoted to track-bridge interaction phenomena in railway bridges of short simply-supported (SS) spans composed by ballasted tracks. These structures may experience high vertical acceleration levels under operating conditions. In particular, the coupling effect exerted by the ballast track shared by structural parts that are theoretically independent, such as consecutive simply-supported spans or twin adjacent single-track decks, is investigated. Experimental evidence shows that in these cases there may be an important vibration transmission from the loaded to the unloaded track, and that the interlocked ballast granules couple some of the lowest modes of vibration to an important extent. To this end a detailed three-dimensional (3D) Finite Element (FE) model of an existing bridge is implemented where the ballast in weakly connected regions is simulated as transversely isotropic material, in order to represent in a simplified manner the degraded state due to the relative motion between the disconnected structural parts. First, the bridge numerical model is updated from the ambient vibration response of the structure previously measured by the authors. Second, a sensitivity analysis is performed on the properties of the degraded ballast and their effect on the first five modes of vibration of the bridge is discussed. Finally, the response of the bridge under operating conditions is computed numerically, compared with the response measured experimentally in the time and frequency domains and conclusions are extracted regarding the model adequacy.

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“…A different approach was used in Liu, Reynders, De Roeck, and Lombaert (2008), Chellini, Nardini, and Salvatore (2011), Ribeiro, Calc ada, Delgado, Brehm, and Zabel (2012) and Malveiro, Ribeiro, Calcada, and Delgado (2013). In all these works, 3D finite element models of railway bridges were developed using solid, shell and beam elements for the bridge and isotropic elastic solid elements for the ballast.…”

Section: Introductionmentioning

confidence: 99%

Influence of the ballasted track on the dynamic properties of a truss railway bridge

Bornet

Andersson

Zwolski

et al. 2014

Structure and Infrastructure Engineering

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This article presents numerical and experimental analyses of a steel truss railway bridge. The main feature of this work is that dynamic experiments have been performed before and after the ballasted track was placed on the bridge. Consequently, it has been possible to quantify the effect of the ballast and the rails on the dynamic properties of the bridge. For that, two finite element models, with and without the ballasted track, have been implemented and calibrated using the experimental results. It appears that the ballast gives an additional stiffness of about 25-30% for the lowest three eigenmodes. This additional stiffness can be only partly explained by the stiffness of the ballast. In fact, it seems that this additional stiffness is also due to a change in the support conditions.

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Dynamical identification and modelling of steel–concrete composite high-speed railway bridges

Cited by 33 publications

References 3 publications

Vertical Coupling Effect of the Ballasted Track on the Dynamic Behavior of Multitrack Railway Bridges Composed by Adjacent Decks

Vertical Coupling Effect of the Ballasted Track on the Dynamic Behavior of Multitrack Railway Bridges Composed by Adjacent Decks

Ballasted track interaction effects in railway bridges with simply-supported spans composed by adjacent twin single-track decks

Influence of the ballasted track on the dynamic properties of a truss railway bridge

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