On the dynamic characterisation of railway bridges through experimental testing

Galvín, P.; Romero, A.; Moliner, Emma; Roeck, Guido De; Martínez-Rodrigo, M.D.

doi:10.1016/j.engstruct.2020.111261

Cited by 35 publications

(27 citation statements)

References 34 publications

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“…Also similar conclusions can be derived from Figs. 15 and 17 associated to passages along track 1, meaning that the transmission of vibrations between the loaded and unloaded decks through the ballast layer is substantial. This coupling effect is also bidirectional as can be derived from the observation of Figs.…”

Section: Track-bridge Interaction Under Train Passagesmentioning

confidence: 99%

“…Under the circulation of Altaria-9 train (Figs. [14][15] the contribution of the fundamental mode prevails and is generally underestimated by the numerical model in both the loaded and unloaded decks. From the previously said, the interaction with the vehicle suspension systems does not seem to play an important role for Altaria-9 trains.…”

Section: Track-bridge Interaction Under Train Passagesmentioning

confidence: 99%

“…The ballasted track over a bridge distributes the axle loads from the rails to the structure, acts as a highfrequency filter and introduces a restraining effect at the end sections [11][12][13][14]. In addition, experimental evidences of load and vibration transfer mechanisms between consecutive spans or adjacent SS decks sharing a continuous ballasted track have been reported over the last years [11][12][13][14][15][16][17]. A vast description of different ballast models developed by researchers in the analysis of train-induced vibrations may be consulted in Reference [18].…”

Section: Introductionmentioning

confidence: 99%

“…The bridge is composed by two identical SS spans and two structurally independent but adjacent single-track decks. A clear dynamic coupling between the spans attributable to the track continuity, and also between the adjacent decks through the shared ballast layer was detected during experimental tests [15]. This work aims to assess the extent of track-bridge interaction effects in such bridges and the key parameters affecting the dynamic coupling between structurally independent parts.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Track-bridge Interaction Under Train Passagesmentioning

confidence: 99%

Section: Track-bridge Interaction Under Train Passagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…The dynamic characterisation of the soil was carried out by the seismic refraction and the Spectral Analysis of Surface Waves (SASW) tests. More details of the experimental campaign, the identified properties of the bridge and surrounding soil and the dynamic response under several train passages may be consulted in Galvín et al (2021).…”

Section: Case Studymentioning

confidence: 99%

Fast simulation of railway bridge dynamics accounting for soil–structure interaction

Galvín

Ordóñez

Moliner

et al. 2021

Bull Earthquake Eng

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A novel numerical methodology is presented to solve the dynamic response of railway bridges under the passage of running trains, considering soil–structure interaction. It is advantageous compared to alternative approaches because it permits, (i) consideration of complex geometries for the bridge and foundations, (ii) simulation of stratified soils, and, (iii) solving the train-bridge dynamic problem at minimal computational cost. The approach uses sub-structuring to split the problem into two coupled interaction problems: the soil–foundation, and the soil–foundation–bridge systems. In the former, the foundation and surrounding soil are discretized with Finite Elements (FE), and padded with Perfectly Match Layers to avoid boundary reflections. Considering this domain, the equivalent frequency dependent dynamic stiffness and damping characteristics of the soil–foundation system are computed. For the second sub-system, the dynamic response of the structure under railway traffic is computed using a FE model with spring and dashpot elements at the support locations, which have the equivalent properties determined using the first sub-system. This soil–foundation–bridge model is solved using complex modal superposition, considering the equivalent dynamic stiffness and damping of the soil–foundation corresponding to each natural frequency. The proposed approach is then validated using both experimental measurements and an alternative Finite Element–Boundary Element (FE–BE) methodology. A strong match is found and the results discussed.

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Optimisation of Cantilever Based Energy Harvester Design for Railway Bridges

Cámara‐Molina,

Romero,

Galvín

et al. 2023

ce papers

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In this paper, the authors investigate energy harvesting on railway bridges. A tuning process based on a statistical analysis of the mechanical energy generated by a lumped‐mass model is presented and validated. A cantilever‐based energy harvester configuration is applied, and the optimal design of 3D printed energy harvesters is studied. The electromechanical behaviour of the device is represented by an analytical model for the estimation of the energy harvested from train‐induced bridge vibrations. A genetic algorithm constrained to geometry and structural integrity is used to solve the optimisation problem. The design flexibility and energy performance are maximised by 3D printing of the substructure of the harvester. An optimal device prototype with PAHT CF15 substructure is designed and manufactured for a real bridge in the Madrid‐Sevilla High‐Speed line. The prototype is experimentally validated under laboratory conditions. Finally, the performance of energy harvesting is evaluated from in situ experimental data measured by the authors. The results allow quantifying the energy harvested in a time window of five hours and twenty‐seven train passages.

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On the dynamic characterisation of railway bridges through experimental testing

Cited by 35 publications

References 34 publications

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

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

Fast simulation of railway bridge dynamics accounting for soil–structure interaction

Optimisation of Cantilever Based Energy Harvester Design for Railway Bridges

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