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Calculation of optimised bridge dynamic amplification factor using bridge weigh-in-motion data [Elektronski vir]
Kalin, Jan ; Žnidarič, Aleš ; Kreslin, Maja, 1980-
The dynamic component of bridge traffic loading is commonly taken into account with a Dynamic Amplification Factor (DAF) % the ratio between the dynamic and static load effects on a bridge. In the ...design codes, this factor is generally higher (more conservative) than in reality. Bridge weigh-in-motion systems use an existing instrumented bridge or culvert to weigh all crossing vehicles at highway speeds. A new method of obtaining DAF experimentally, using bridge weigh-in-motion (B-WIM) measurements, will be presented in this paper. Data from several bridge sites has been used to evaluate DAF with the proposed method. The results agree with numerical simulations and experiments performed in the ARCHES project: dynamic amplification decreases as static loading increases. The reason is that the extreme loading events, which include several heavy trucks with many axles, induce far smaller dynamic amplification than the lighter individual vehicles. This point is extremely important for assessment of bridges.
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