A CASE FOR ADDING AN INSPECTION LEVEL RELATED TO SHM FOR BRIDGE EVALUATION

2020 ◽  
Author(s):  
Aftab Mufti ◽  
Farnaz Raeisi ◽  
Huma Khalid ◽  
Andy Horosko ◽  
Baidar Bakht
Keyword(s):  
Human Life ◽  
Highway Bridge ◽  
Load Carrying Capacity ◽  
Design Code ◽  
Optimum Load ◽  
Target Reliability Index ◽  
Bridge Evaluation ◽  
Load Carrying ◽  
Vehicle Loads ◽  
Existing Bridges

The Canadian Highway Bridge Design Code (CHBDC) uses the concept of a target reliability index for evaluating the load carrying capacity of existing bridges. This index, which is based on risk to human life, relates to three aspects of uncertainties inherent in a bridge; (a) element behaviour, (b) system behavior, and (c) inspection level, where the inspection level currently refers to only manual inspections. Citing examples of tests on many instrumented bridges, the paper proposes an additional inspection level for inspections done with the help of electronic instruments and tests under controlled vehicle loads. The paper proposes simple additions to clauses of the CHBDC, for use when determining the optimum load carrying capacities of existing bridges where structural health monitoring (SHM) information is available.

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.

scholarly journals Load testing of Highway Bridge

2018 ◽  
Vol 196 ◽  
pp. 02020 ◽  
Author(s):  
Petra Bujňáková ◽  
Jozef Jošt ◽  
Matúš Farbák
Keyword(s):  
Static Load ◽  
Highway Bridge ◽  
Load Carrying Capacity ◽  
Load Testing ◽  
Construction Process ◽  
Structural Behaviour ◽  
Box Girder ◽  
Load Carrying ◽  
Predicted Model ◽  
The City

New segmental concrete bridge has been built near the city Žilina, aligned on European highway corridor E 50. The bridge is composed of the two separate precast prestressed box girder structure constructed by balanced cantilever method. The total length of both structures is 1042 m. The similar superstructure consists of a total of eighteen continuous spans with main spans of 60.5 m. The construction process, load carrying capacity and monitoring of the bridge has been investigated before the opening of the bridge. The paper presents verification of the structural behaviour of the bridge under static load compared to predicted model for both precast prestressed structures.

scholarly journals Canadian highway bridge evaluation: reliability index

1992 ◽  
Vol 19 (6) ◽  
pp. 987-991 ◽  
Author(s):  
D. E. Allen
Keyword(s):  
Reliability Index ◽  
Life Safety ◽  
Highway Bridge ◽  
Traffic Network ◽  
Structural Behaviour ◽  
Effective Manner ◽  
Bridge Evaluation ◽  
Safety Considerations ◽  
Existing Bridges ◽  
Economic Considerations

So that the limited funds available for bridge upgrading can be spent in the most effective manner, the reliability index assumed for evaluation of existing bridges requires a closer definition than that assumed for the design of new bridges. A reliability index which varies between 2.0 and 3.75 is determined for bridge evaluation in Clause 12 of CAN/CSA-S6-88 on the basis for life-safety considerations and calibration to experience. The reliability index is chosen by the evaluator as a function of structural behaviour, level of inspection and evaluation, and traffic situation for which the evaluation is made, all of which affect life safety. Economic considerations are also taken into account; the highway authority may, however, wish to increase the values of the reliability index for critical bridges whose failure seriously affects the traffic network. Key words: bridge evaluation, reliability index, life safety, economics.

Evaluation of the Riveted Joint Load-Carrying Capacity Based on the Formed Rived Head Dimension

2014 ◽  
Vol 224 ◽  
pp. 261-266
Author(s):  
Zbigniew Lis ◽  
Adam Lipski
Keyword(s):  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Head Diameter ◽  
Optimum Load ◽  
Riveted Joint ◽  
Load Carrying ◽  
Joint Load ◽  
Relationship Of ◽  
Special Instrumentation

The formed rivet head was measured in order to verify rivet closing-up forcein the executed riveted joint. The measurements were performed using two specimen series with strapped joint. The first series of specimens was prepared using standard riveting technology: drilling and reaming of holes and kinematic heading of rivets. In the second series of specimens modified technology was used: drilling, sizing and heading of rivets with controlled heading force.The relationship of the formed rivet head diameter on the heading force was determined. For that purpose tests with controlled heading force were performed and the formed rivet head diameter for each force was measured. The limits of formed rivet head diameter for the second series of specimens, which were headed using controlled heading force were calculated. Based on the scatter of formed rivet head diameters for the first series of specimens the range of forces achieved during kinematic heading of rivets was determined. The riveted joint load-carrying capacity using tension was assumed. Special instrumentation was prepared for riveted joint tests. Achieved joint load-carrying capacity results were collated with specific heading forces for the first series of specimens. Based on the heading force values put on the load-carrying capacity diagram was concluded that kinematic heading does not guarantee achievement of the optimum load-carrying capacity.

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.

Maintenance Strategies of Historical Bridges in China

2012 ◽  
Vol 178-181 ◽  
pp. 2264-2267
Author(s):  
Zhi Feng Wang ◽  
Gui Hua Dai
Keyword(s):  
Load Carrying Capacity ◽  
Cold Winter ◽  
Maintenance Strategies ◽  
Existing Problems ◽  
Load Carrying ◽  
Safety And Reliability ◽  
1960S And 1970S ◽  
Existing Bridges ◽  
Bridge Assessment ◽  
Intense Heat

In China a large number of bridges built in 1960s and 1970s are still in operation. They went through several decades of intense heat and cold winter, water scouring, and accelerated load-increasing, which will lead to the deterioration of the structure. They are in the need of maintenance, reinforcement and transformation. The bridge assessment, maintenance, reinforcement and strengthening for the safety and reliability of existing bridges had attracted the attention of researchers. It’s essential to reinforce the old bridges with appropriate designs and construction technologies to improve its load-carrying capacity and extend the service life to meet the requirements of the current transportation. This paper first introduced China’s current situation and existing problems of the bridges. Then the strengthening methods and techniques for the existing damaged bridges are presented. The conclusions and future prospects are finally given.

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.

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