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
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