WP 15 Survey of Highway Structures

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WP 15 Survey of Highway Structures

• Ale nidaricEugene OBrien, Joan Casas, Alan
  OConnor, Tomasz Wierzbicki

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WP 15 SurveyObjective

• To provide an updated inventory and assessment of
  highway structures in selected EEA and CE
  countries.

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WP 15 SurveyTasks

• 15.1 Data collection
• 15.2 Condition assessment
• 15.3 Loading
• 15.4 Structural safety
• 15.5 Survey

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WT 15.1 Data collection
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WT 15.2 Condition Assessment

• focus on procedures used for assessment of
  structural condition
• compare of different CA methodologies
• overview of the highway structures condition in
  selected countries

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WT 15.2 Condition Assessment

• experience from the following countries has been
  covered in the SAMARIS
• Czech Republic Austria
• Hungary Denmark
• Norway France
• Poland Germany
• Slovenia United Kingdom
• United States
• links to COST 345, PIARC C11

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WT 15.2 Condition Assessment

• Straightforward instructions on how to
• detect possible deterioration processes
• indicate condition of structures and their
  elements
• assess condition of the whole structure
  population
• rank structures for urgent repair and maintenance
  strategies
• optimise allocation of budget

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WT 15.2 Condition Assessment Handbook of
damages

• purpose to facilitate and improve identification
  of damages on structures
• during the training for bridge inspectors
• to clarify ambiguous cases
• based on COST 345 application
• Internet application
• inspect and add new information
• searching tool

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WT 15.2 Condition Assessment
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WT 15.3 Loading

• subtask 15.3.1 Dead Loads
• subtask 15.3.2 True traffic loading
• subtask 15.3.3 Live load modelling
• subtask 15.3.4 Dynamic loading
• subtask 15.3.5 Experiments

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WT 15.3 LoadingDead Loads

• evaluation of existing procedures
• assessment of data
• demonstration of dead load evaluation

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WT 15.3 LoadingTrue Traffic Loading

• 15.3.2 True Traffic Loading
• WIM Data collected from 20 sites in Slovenia 6
  sites in the Netherlands (thanks to DWW)

• Data analysed at UCD to determine characteristics
  of weight distribution by season/road type
  (inter-urban, etc.)

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WT 15.3 LoadingLive Load Modelling

• Inaccuracies in existing techniques identified
  (shape of statistical distribution)

• Mixing of different statistical parameters
  (moment due to two trucks meeting with moment due
  to 3 trucks meeting)

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WT 15.3 Loading Dynamic Loading

• Simple dynamic models of bridge-truck integration
  to identify critical combinations of speed and
  spacing

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WP 15.3 LoadingDynamic Loading

• Full dynamic models of bridge-truck interaction
  for multiple trucks have also been developed
• In process of being calibrated with
  experimentally recorded WIM data
• Currently looking at influence of pavement
  roughness

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WP 15.3 LoadingExperimental Programme

• 2 experiments planned
• different structural forms and levels of
  deterioration, road profile and therefore dynamic
  characteristics
• different geographic location and traffic
  characteristics
• different durations of recording proposed
• different loading scenarios govern extreme

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WP 15 LoadingExperiment 1 in Poland
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WP 15 LoadingExperiment 1 in Poland
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WP 15 LoadingExperiment 2 in Slovenia

• to assess influence of pavement unevenness on
  bridge dynamics
• to get statistically evaluated impact factors for
  2-week population of vehicles before and after
  rehabilitation
• bridge WIM electronics upgraded for
  dynamicmeasurements

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WP 15 Survey Experiments
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WP 15 LoadingExperiment 2 in Slovenia
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WP 15 Safety

• surveyed work of BRIME (European Research
  Project), COST345, ISO, JCSS, PIARC (World Road
  Association)

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WP 15 Safety

• countries having special guidelines for safety
  assessment of existing highway bridges, have been
  or will be analysed
• Canada
• Czech Republic
• Denmark
• Norway
• Slovenia
• Switzerland
• United Kingdom
• USA

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WP 15 Safety Provisional conclusions

• in many countries no safety codes exist, benefits
  in assessment where they do
• safety assessment should be based on LSF
• 5 levels of analysis form the most efficient
  assessment process
• resistance formulas for undamaged elements can
  not be the same as for the deteriorated ones
• no consensus on how to do loading tests
• different target reliability levels for design
  and assessment may be considered

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Conclusion

• work in WP 15 is well under way
• expected benefits explicit guidelines and
  recommendations how to improve and optimise
  assessment of existing highway structures using
• more modern assessment techniques
• better load modelling
• realistic dynamic loading
• safety assessment procedures