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The influence of pre-existing vibrations on the dynamic response of medium span bridges
Date Issued
2009-01
Date Available
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.
Sponsorship
Irish Research Council for Science, Engineering and Technology
Other funder
Other Sponsorship
IRCSET
The European 6th Framework Project ARCHES (Assessment and Rehabilitation of Central European Highway Structures)
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
Subject – LCSH
Bridges--Live loads
Loads (Mechanics)
Bridges--Vibration
Web versions
Language
English
Status of Item
Peer reviewed
ISSN
1208-6029
This item is made available under a Creative Commons License
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