A rough assessment of railway bridges for high speed trains

Frýba, Ladislav

doi:10.1016/s0141-0296(00)00057-2

Cited by 184 publications

(85 citation statements)

References 3 publications

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“…The response computed with the moving loads model at non-resonance speeds is in good agreement with experiments as shown in [9,12]. Nevertheless, at resonance speeds bridge displacements and accelerations can be significantly magnified leading to dangerous situations.…”

Section: Introductionsupporting

confidence: 82%

Advances in the analysis of short span railway bridges for high-speed lines

Museros¹,

Romero²,

Poy³

et al. 2002

Computers & Structures

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The physical model based on moving constant loads is widely used for the analysis of railway bridges. Nevertheless, the moving loads model is not well suited for the study of short bridges (L < 20-25 m) since the results it produces (displacements and accelerations) are much greater than those obtained from more sophisticated ones. In this paper two factors are analysed which are believed to have an influence in the dynamic behaviour of short bridges. These two factors are not accounted for by the moving loads model and are the following: the distribution of the loads due to the presence of the sleepers and ballast layer, and the train-bridge interaction. In order to decide on their influence several numerical simulations have been performed. The results are presented and discussed herein.

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Section: Introductionsupporting

confidence: 82%

Advances in the analysis of short span railway bridges for high-speed lines

Museros¹,

Romero²,

Poy³

et al. 2002

Computers & Structures

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show abstract

“…The phenomena of resonance and cancellation experienced by beams or bridges under the circulation of moving loads has been studied by several researchers [6,[10][11][12][13][14][15][16][17]. Nevertheless in the previous works, soil-structure interaction is always disregarded and classical boundary conditions are assumed for the bridge deck.…”

Section: Introductionmentioning

confidence: 99%

Effect of soil properties on the dynamic response of simply-supported bridges under railway traffic through coupled boundary element-finite element analyses

Martínez-Rodrigo

Galvín

Doménech

et al. 2018

Engineering Structures

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Railway induced vibrations on short-to-medium span simply-supported (SS) bridges is addressed in this contribution. Such structures may experience high levels of vertical acceleration at the platform, leading to adverse consequences such as a premature degradation of the ballast layer and passenger discomfort. In the present study, the evolution of the bridge dynamic response when soil-structure interaction (SSI) is taken into account is investigated. To this end a coupled three-dimensional (3D) Boundary Element-Finite Element model (BEM-FEM) formulated in the time domain is implemented to reproduce the soil and structural behaviour, respectively. First, a set of soil-bridge systems of interest is defined, covering a wide range of lengths and natural frequencies for the structures, and an interval of expectable elastic properties and damping levels for the soil. Then, different types of analyses are performed on the soil-bridge systems extracting conclusions regarding the effect of including SSI in numerical models for predicting the bridge behaviour under railway traffic. In particular natural frequencies and modal damping levels are identified, and the structure amplification after the passage of a moving load in free vibration is investigated. Conclusions regarding how resonance and cancellation conditions may be affected by soil properties are extracted. Finally, the dynamic response of a real bridge, belonging to the Spanish railway network, is evaluated under the circulation of trains that induce second and third resonances of the bridge fundamental mode. The effect of the soil flexibility, soil material damping and the bridge resonance order are evaluated. Conclusions regarding the appropriateness of the results provided by common models which do not include SSI effects are extracted.

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“…In [13] span to car length optimal ratios are proposed in order to suppress the first resonance of the fundamental mode of SS beams. A few years later in [14] approximate formulas for predicting the amplitudes for the maximum deflection, bending moment and transverse acceleration of SS beams subjected to first resonance of the fundamental mode are presented. In [15] the authors investigate the relevance of the second bending mode contribution for the determination of the maximum displacement and acceleration responses in high-speed bridges using beam models.…”

Section: Introductionmentioning

confidence: 99%

On the basic phenomenon of soil-structure interaction on the free vibration response of beams: Application to railway bridges

Doménech

Martínez-Rodrigo

Romero

et al. 2016

Engineering Structures

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The dynamic transverse response of beam type bridges under railway traffic is addressed in this contribution. In particular, how soil-structure interaction may affect the critical or resonant speeds and the associated vibratory amplitudes is evaluated in detail. Resonance in beams, due to the circulation of equidistant loads, is highly influenced by the free vibration response that every single load leaves after traversing the structure. On this basis a numerical investigation is carried out analysing the effects of the wave propagation problem on the free vibration response of simply-supported beams in a wide range of travelling speeds. To this end a coupled three-dimensional boundary element-finite element model formulated in the time domain is used to reproduce the soil and structural behaviour, respectively. A catalogue of bridge deck typologies is defined, covering lengths, associated linear masses and fundamental frequencies that may experience high levels of transverse accelerations under resonant conditions, for nowadays existing trains and design speeds. Lengths ranging from 12.5 to 25 m are evaluated, along with fundamental frequencies covering most common typologies. A homogeneous soil is considered with shear wave speeds in the interval 150 to 365 m/s. From the single load free vibration parametric analysis conclusions are derived regarding the conditions of maximum free vibration and cancellation of the deck response. These conclusions are used afterwards to justify how resonant amplitudes of the bridge under the circulation of railway convoys may be affected by the soil properties, leading to substantially amplified responses or to almost imperceptible ones, and a numerical example is included to show the aforementioned situations.

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A rough assessment of railway bridges for high speed trains

Cited by 184 publications

References 3 publications

Advances in the analysis of short span railway bridges for high-speed lines

Advances in the analysis of short span railway bridges for high-speed lines

Effect of soil properties on the dynamic response of simply-supported bridges under railway traffic through coupled boundary element-finite element analyses

On the basic phenomenon of soil-structure interaction on the free vibration response of beams: Application to railway bridges

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