The influence of pre-existing vibrations on the dynamic response of medium span bridges

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Title: The influence of pre-existing vibrations on the dynamic response of medium span bridges
Authors: Rattigan, Paraic
González, Arturo
O'Brien, Eugene J.
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Date: Jan-2009
Online since: 2010-11-04T16:47:15Z
Abstract: Critical static bridge loading scenarios are often expressed in terms of the number of vehicles that are present on the bridge at the time of occurrence of maximum lifetime load effect. For example, 1-truck, 2-truck, 3-truck or 4-truck events usually govern the critical static loading cases in short and medium span bridges. However, the dynamic increment of load effect associated with these maximum static events may be assessed inaccurately if it is calculated in isolation of the rest of the traffic flow. In other words, a heavy vehicle preceding a critical loading case causes the bridge initial conditions of displacement and acceleration to be non zero when the critical combination of traffic arrives on the bridge. Failure to consider these pre-existing vibrations will result in inaccurate estimation of dynamic amplification. This paper explores these dynamic effects and, using statistical analyses outlines the relative importance of pre-existing vibrations in the assessment of total traffic load effects.
Funding Details: Irish Research Council for Science, Engineering and Technology
Other funder
Type of material: Journal Article
Publisher: NRC Research Press / Presses scientifiques du CNRC
Journal: Canadian Journal of Civil Engineering
Volume: 36
Issue: 1
Start page: 73
End page: 84
Keywords: BridgeDynamicFree vibrationTraffic loading
Subject LCSH: Bridges--Live loads
Loads (Mechanics)
DOI: 10.1139/L08-104
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Language: en
Status of Item: Peer reviewed
Appears in Collections:Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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