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Calculating a bridge assessment dynamic ratio using a bridge weigh-in-motion system
  Bridges are designed and assessed for characteristic load effects, that is, those load effects corresponding to a certain return period. Maximum static load effects are measured or simulated and these are multiplied be some factor to allow for dynamics. The recommended allowance for dynamics is necessarily conservative to allow for the broadly varying circumstances covered by the bridge codes. Quantifying the dynamic increment of load effect, Dynamic Amplification Factor (DAF) is typically used. This paper however, is concerned with Assessment Dynamic Ratio (ADR), which is related to return period in preference to DAF which is specific to a single traffic event. Recent studies in this area have shown that there is a falling trend in ADR as return period increases. Using Bridge-based Weigh-In-Motion (B-WIM) systems is use at the moment, this trend indicates that it may be possible to extract a realistic and site-specific ADR value, given bridge measurements taken over a relatively short time period. This paper looks at the accuracy of the system used to gather the data, specifically the algorithm upon which the most popular B-WIM systems are based. Project presentation can be accessed here
   
content link: http://www.ectri.org/YRS09/Papiers/Session6/Dowling_J_Session6_Road_Transport(1).pdf
   
content language: English
English summary: yes
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This content is related to:
 
project type
National projects 
area of interest
 bridges & retaining walls
 construction materials
 MOBILITY & TRANSPORT
 SUB-THEMES
user type
road authorities/owners 
material producers 
consultancies 
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created: Sylvia Derveaux, 31.08.2009 12:00:00
last modified: Sylvia Derveaux, 31.08.2009 12:01:00
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