Reserves in load capacity assessment of existing bridges

Žitný, Jan; Ryjáček, Pavel

doi:10.1088/1757-899x/236/1/012061

Cited by 4 publications

(1 citation statement)

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“…It will also be necessary to design possible structural solutions that would ensure such unconventional fixing of ribbon track is safe, durable and can ensure the required track speed of 120 km/h. The application of current principles of bridge evaluation [2,3,4] and the use of advanced models combining numerical and experimental analysis can lead into satisfactory result, [5]. The rail truck-structure interaction is complex task which need this type of complex approach, [6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Impact of the Ribbon Track on Unconventional Fixing on a Steel Multi‐Span Bridge

Odrobiňák,

Farbák,

Prokop

et al. 2023

ce papers

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The presented analysis deals with the influence of ribbon rail track on its unconventional fixing on a steel multi‐span bridge. Specially adapted stiffeners for the transfer of horizontal forces from the track to the superstructure are used in such cases. Local defects created over the years point out the overstressing of the fixing stiffeners to the combined response of the structure and the track. Subsequently, there is an adverse effect on the continuous ribbon track and the speed or pass‐ability of the bridge can be significantly limited.Numerical analyses are confronted with in‐situ experimental measurements realized at the 450 m long 14‐span‐bridge within an international railway line. Experimental measurements were focused mainly on influence of temperature and breaking/accelerating forces. The results showed a significant impact of temperature effects on the rails leading into unexpected longitudinal displacements and unwanted stresses in the analyzed details of the track fixation. A global model and local sub‐models in two FEM software were elaborated to analyze real behavior in a theoretical way.Researchers from the university and the R&D staff of the state railway administrator's institute collaborated in this research within the mutual long‐term cooperation.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Impact of the Ribbon Track on Unconventional Fixing on a Steel Multi‐Span Bridge

Odrobiňák,

Farbák,

Prokop

et al. 2023

ce papers

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Probabilistic Assessment of the Equilibrium of a Steel Railway Bridge Based on Wind Tunnel and Traffic Records

Žitný

Ryjáček

Sýkora

et al. 2023

Structural Engineering International

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Resistance Models for Semi-Probabilistic Assessment of Historic Steel Bridges

Lenner¹,

Ryjáček²,

Sýkora³

2020

IABSE Symposium, Wroclaw 2020: Synergy of Culture and Civil Engineering – History and Challenges

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<p>The mechanical properties of historic metal materials exhibit a considerable scatter dependent on periods of construction and the region of a producer. Assessments of historic metal bridges then need to be based on measurements and tests. The use of non- or minor-destructive tests (NDTs) is often preferred over to destructive tests (DTs) to reduce the cost of structural survey. This contribution explores the measurement errors associated with common NDT hardness techniques and quantifies uncertainties in design (assessment) values of resistance. When deriving the partial factor, the uncertainty in geometry and model uncertainty is considered along with the variability of a material property and measurement error. Numerical studies reveal the effects of measurement error and model uncertainty (bending, buckling) on assessment values of resistance. A unity mean and coefficient of variation of 12% might be adopted for the measurement uncertainty of the hardness methods under study as a first approximation. On average, the true assessment resistance is by ~15% larger than that based on a NDT survey. Model uncertainty affects the partial factor for resistance of historic metal bridges.</p>

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Reserves in load capacity assessment of existing bridges

Cited by 4 publications

References 1 publication

Analysis of the Impact of the Ribbon Track on Unconventional Fixing on a Steel Multi‐Span Bridge

Analysis of the Impact of the Ribbon Track on Unconventional Fixing on a Steel Multi‐Span Bridge

Probabilistic Assessment of the Equilibrium of a Steel Railway Bridge Based on Wind Tunnel and Traffic Records

Resistance Models for Semi-Probabilistic Assessment of Historic Steel Bridges

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