The Influence of Truck Characteristics on the Vibration Response of a Bridge
The measured vibration response of highway bridges is influenced by different factors including truck loads. The speed, length, number of axles and their spacing, weight and suspension type are all truck characteristics that are known to influence the vibration response of highway bridges. A bridge’s structural characteristics and the pavement condition leading up to a bridge crossing also determine the vibration response due to truck loads. The specific influence of the various truck characteristics on the vibration response of highway bridges is generally difficult to quantify analytically or experimentally given that many of these truck characteristics are unmeasured. This paper presents the results of an investigation on the effects of measured truck characteristics on the measured vibration responses of a concrete multi-beam bridge. The bridge is being continuously monitored with triggered high-speed recordings of strains and vibrations during truck crossing events. A weigh-in-motion system located in the roadway in front of the bridge measures the weight, speed and other characteristics of every truck that crosses the bridge. The effects of the different truck characteristics on the measured vibration response of the structure were evaluated in both time and frequency domains. The results of these evaluations are presented and discussed, and the most influential truck characteristics are identified.
KeywordsBridges Vibration Prestressed concrete Structural health monitoring Weigh-in-motion
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