scholarly journals Existing Steel Railway Bridges Evaluation

2016 ◽  
Vol 12 (2) ◽  
pp. 103-110 ◽  
Author(s):  
Josef Vičan ◽  
Jozef Gocál ◽  
Jaroslav Odrobiňák ◽  
Peter Koteš
Keyword(s):  
Carrying Capacity ◽  
Global Analysis ◽  
Evaluation Process ◽  
Steel Bridge ◽  
Load Carrying Capacity ◽  
Railway Bridges ◽  
Load Carrying ◽  
Bridge Superstructure ◽  
Existing Bridges ◽  
Capacity Determination

Abstract The article describes general principles and basis of evaluation of existing railway bridges based on the concept of load-carrying capacity determination. Compared to the design of a new bridge, the modified reliability level for existing bridges evaluation should be considered due to implementation of the additional data related to bridge condition and behaviour obtained from regular inspections. Based on those data respecting the bridge remaining lifetime, a modification of partial safety factors for actions and materials could be respected in the bridge evaluation process. A great attention is also paid to the specific problems of determination of load-caring capacity of steel railway bridges in service. Recommendation for global analysis and methodology for existing steel bridge superstructure load-carrying capacity determination are described too.

Determination of Load-Carrying Capacity of Railway Steel and Concrete Composite Bridges

2016 ◽  
Vol 691 ◽  
pp. 172-184 ◽  
Author(s):  
Josef Vican ◽  
Jaroslav Odrobinak ◽  
Peter Kotes
Keyword(s):  
Carrying Capacity ◽  
Global Analysis ◽  
Evaluation Process ◽  
Load Carrying Capacity ◽  
Railway Bridges ◽  
Load Carrying ◽  
Composite Bridges ◽  
Existing Bridges ◽  
And Behavior

In the frame of global European standardization and in consequence of new knowledge related to existing bridges, the need for revision of the service handbook "Determination of load-carrying capacity of railway bridges" grown up. The paper presents general concepts and basic assumptions for determining the railway bridge load-carrying capacity. In contrast to design of a new bridge, additional data related to existing bridge condition and behavior like information from regular inspections and real state of degradation can be taken into account. Based on these data together with the remaining lifetime, a modification of reliability levels for existing bridges based on the mathematic theory of probability can be adopted in the evaluation process. Special attention is also paid to the specific features of determination of load caring capacity of steel-concrete composite bridges in exploitation. Recommendation and allowances for global analysis of existing composite steel and concrete superstructures for the purpose of the load-carrying capacity estimation are discussed as well.

Determination of Load-Carrying Capacity of Railway Concrete Bridges According to New Guideline

2017 ◽  
Vol 738 ◽  
pp. 100-109
Author(s):  
Josef Vican ◽  
Peter Kotes ◽  
Martin Moravcik ◽  
Jaroslav Odrobinak
Keyword(s):  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Additional Data ◽  
Global Analysis ◽  
Concrete Bridges ◽  
Load Carrying Capacity ◽  
Railway Bridges ◽  
Load Carrying ◽  
Real State

The handbook "Determination of load-carrying capacity of railway bridges" [1] has grown up due to updating of old Slovak guideline [2] taking into account Eurocodes. In the case of railway bridges, there are about 2300 bridges in Slovakia and about 78 % of them are from concrete or masonry. About 28 % of bridge total number is older than 77 years and about 18 % of them are even older than 100 years. Therefore, there is need to make regular inspections, recalculate them – determine of load-carrying capacity and then to decide, which of them should be repaired or reconstructed [3,4]. The paper presents general concepts and basic assumptions for determining the load-carrying capacity of reinforced and prestressed concrete railway bridges. In contrast to design of a new bridge, additional data related to existing bridge condition and its behaviour like information from regular inspections and real state of degradation can be taken into account. Special recommendation and allowances for global analysis of existing concrete superstructures for the purpose of the load-carrying capacity estimation are discussed, as well.

Load-Carrying Capacity Improvement and Seismic Upgrading of a 1914 Riveted Steel Bridge

2013 ◽  
Vol 23 (4) ◽  
pp. 528-533
Author(s):  
Marco Breccolotti ◽  
Carlo Alberto Beffa ◽  
Andrea Rapicetta ◽  
Fabio Pelliccia
Keyword(s):  
Carrying Capacity ◽  
Steel Bridge ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Capacity Improvement

scholarly journals Reliability-based load-carrying capacity assessment of bridges using structural health monitoring and nonlinear analysis

2018 ◽  
Vol 18 (1) ◽  
pp. 20-34 ◽  
Author(s):  
Shojaeddin Jamali ◽  
Tommy HT Chan ◽  
Andy Nguyen ◽  
David P Thambiratnam
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Carrying Capacity ◽  
Assessment Procedure ◽  
Load Rating ◽  
Load Carrying Capacity ◽  
Structural Health ◽  
Load Carrying ◽  
Existing Bridges ◽  
Bridge Assessment

For assessment of existing bridges, load rating is usually performed to assess the capacity against vehicular loading. Codified load rating can be conservative if the rating is not coupled with the field data or if simplifications are incorporated into assessment. Recent changes made to the Australian Bridge assessment code (AS 5100.7) distinguish the difference between design and assessment requirements, and include addition of structural health monitoring for bridge assessment. However, very limited guidelines are provided regarding higher order assessment levels, where more refined approaches are required to optimize the accuracy of the assessment procedure. This article proposes a multi-tier assessment procedure for capacity estimation of existing bridges using a combination of structural health monitoring techniques, advanced nonlinear analysis, and probabilistic approaches to effectively address the safety issues on aging bridges. Assessment of a Box Girder bridge was carried out according to the proposed multi-tier assessment, using data obtained from modal and destructive testing. Results of analysis at different assessment tiers showed that both load-carrying capacity and safety index of the bridge vary significantly if current bridge information is used instead of as-designed bridge information. Findings emerged from this study demonstrated that accuracy of bridge assessment is significantly improved when structural health monitoring techniques along with reliability approaches and nonlinear finite element analysis are incorporated, which will have important implications that are relevant to both practitioners and asset managers.

scholarly journals On the Influence of Corrosion on the Load-Carrying Capacity of Old Riveted Bridges

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 717
Author(s):  
Jozef Gocál ◽  
Jaroslav Odrobiňák
Keyword(s):  
Carrying Capacity ◽  
Steel Corrosion ◽  
Transport Infrastructure ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Bridge Structures ◽  
Capacity Calculation ◽  
Existing Bridges ◽  
The Impact ◽  
Bridge Substructures

Steel corrosion is one of the most dominant factors in the degradation of transport infrastructure. This article deals with the impact of the atmospheric corrosion of structural steel on the load-carrying capacity of old riveted bridge structures. A study on the impact of corrosion losses on the resistance and, thus, the load-carrying capacity of eight chosen bridge members with riveted I-sections from three different bridge substructures is presented. The load-carrying capacity calculation is carried out using modern procedures and on the basis of the diagnosed state of the structural elements. Within the analysis of the results, the need for long-term in situ corrosion measurements, as well as the need for regular inspections on the existing bridges are also discussed.

Bridges Tested to Failure in Sweden

2018 ◽  
Author(s):  
Björn Täljsten ◽  
Thomas Blanksvärd ◽  
Gabriel Sas ◽  
Niklas Bagge ◽  
Jonny Nilimaa ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
The Real ◽  
Existing Structures ◽  
Steel Truss Bridge ◽  
Standard Code ◽  
Load Carrying ◽  
Existing Bridges ◽  
Truss Bridge

Five bridges of different types have been tested to failure and the results have been compared to analyses of the load-carrying capacity using standard code models and advanced numerical methods. The results may help to make accurate assessments of similar existing bridges. There it is necessary to know the real behaviour, weak points, and to be able to model the load-carrying capacity in a correct way.<p> The five bridges were: (1) a strengthened one span concrete road bridge - Stora Höga ; (2) a one span concrete rail trough bridge loaded in fatigue – Lautajokk; (3) a two span strengthened concrete trough railway bridge - Övik; (4) a one span railway steel truss bridge -Åby; and (5) a five span prestressed concrete road bridge - Kiruna. The unique results in the paper are the experiences of the real failure types, the robustness/weakness of the bridges, and the accuracy and shortcomings/potentials of different codes and models for safety assessment of existing structures.

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