Auswirkungen der ebenen Boden-Bauwerk-Interaktion auf die Eigenfrequenz von Eisenbahnrahmenbrücken/Influence of plane strain soil-structure interaction on the eigenfrequency of railroad frame bridges

Heiland, Till; Thomas, L.M.; Galiazzo, Mark; Stempniewski, Lothar; Stark, Alexander

doi:10.37544/0005-6650-2022-05-43

Cited by 3 publications

(2 citation statements)

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“…This can lead to divergent structural stiffening due to a phase shift at about ≈10 Hz. The stiffening phenomenon due to counter-phase vibrating foundations is discussed in [51].…”

Section: Identification Of Natural Frequenciesmentioning

confidence: 99%

The Dynamic Characteristics of Railway Portal Frame Bridges: A Comparison between Measurements and Calculations

Heiland,

Stempniewski,

Stark

2024

Applied Sciences

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Railway bridges are subjected to significant dynamic loads. A numerical model of the bridge structure that captures its dynamic characteristics as accurately as possible is essential for the simulation of train crossings. However, most existing Calculation Models either do not consider the dynamic interaction between the structure and the soil, known as the soil–structure interaction (SSI), or give it only secondary importance. As a result, the accuracy of the predicted dynamic characteristics is affected. This paper illustrates how the dynamic interactions of abutments impact the portal frame bridge’s SSI. This influence prompts the question of incorporating the frequency-dependent influence of the structure–soil–structure interaction (SSSI) into the modelling process. We propose a conservative estimation of the frequency range influenced by the shear wave interference of the SSSI and recommend using it as an application limit in the development of computational models. Based on this estimation, a Calculation Model is presented. In this approach, the SSI is considered using the well-known quasi-static spring–damper method from foundation vibration analysis, adhering to limitations based on the SSSI. For the application of the presented Calculation Model, four concrete portal frame bridges with spans between 9 m and 17 m along the high-speed line from Nuremberg to Munich, Germany, are investigated by analyzing the dynamic characteristics and comparing them with the prediction of the proposed numerical Calculation Model. The presented method shows good calculation accuracy.

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“…This can lead to divergent structural stiffening due to a phase shift at about ≈10 Hz. The stiffening phenomenon due to counter-phase vibrating foundations is discussed in [51].…”

Section: Identification Of Natural Frequenciesmentioning

confidence: 99%

The Dynamic Characteristics of Railway Portal Frame Bridges: A Comparison between Measurements and Calculations

Heiland,

Stempniewski,

Stark

2024

Applied Sciences

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“…Further, a parametric study is carried out as a threshold analysis to investigate the effects of a stiffness-effective ballast on the natural frequencies of frame bridges. The first bending frequency of the frame 𝑓 𝑅 is calculated by extending the frame formula according to [15]. Here, the superstructure stiffness is obtained using the equivalent cross-section method, which increases the slab-stiffness as a function of equation (6).…”

Section: As a Function Of The Accelerationmentioning

confidence: 99%

A Contribution to the Material Behaviour of Ballast on Railway Bridges

Heiland¹,

Hägle²,

Stark³

Civil-Comp Conferences

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Railway bridges are subjected to intensive dynamic stresses due to train crossings. The resulting system response (accelerations) is estimated in advance through dynamic calculations. The basis of the calculations is the knowledge of the natural frequencies. Various studies have shown that a discrepancy between the measured and the numerical determination of these natural frequencies often occurs for short frame bridges. In common practice, the ballast is assumed to be non-supporting regarding the global structural stiffness. In some cases, rheological models of vertical springs and dashpots are used to consider the load distribution in vertical direction.This publication discusses ballast stiffness on the material level. This leads to a stiffness contribution of the ballast to the horizontal stiffness (fraction of bending stiffness) and thus to a stiffening of the structure. It is shown that ballast can be defined in terms of stress and shear strain dependence. If ballast stresses and expected superstructure accelerations are known, an equivalent ballast stiffness can be determined and taken into account in a dynamic calculation using a linear approach. The material approach is verified by a scaled component test and a parallel numerical reference calculation.

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Stiffness contributions of ballast in the context of dynamic analysis of short span railway bridges

Heiland¹,

Hägle²,

Triantafyllidis³

et al. 2022

Construction and Building Materials

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Auswirkungen der ebenen Boden-Bauwerk-Interaktion auf die Eigenfrequenz von Eisenbahnrahmenbrücken/Influence of plane strain soil-structure interaction on the eigenfrequency of railroad frame bridges

Cited by 3 publications

References 0 publications

The Dynamic Characteristics of Railway Portal Frame Bridges: A Comparison between Measurements and Calculations

The Dynamic Characteristics of Railway Portal Frame Bridges: A Comparison between Measurements and Calculations

A Contribution to the Material Behaviour of Ballast on Railway Bridges

Stiffness contributions of ballast in the context of dynamic analysis of short span railway bridges

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