Type

Journal Article

Authors

Eugene J. O'Brien
Arturo González
Paraic Rattigan

Subjects

Engineering

Topics
bridge bridges live loads lifetime maximum load loads mechanics traffic loading free vibration bridges vibration

The influence of pre-existing vibrations on the dynamic response of medium span bridges (2009)

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.
Collections Ireland -> University College Dublin -> Critical Infrastructure Group Research Collection
Ireland -> University College Dublin -> Interdisciplinary Centres & Research Groups
Ireland -> University College Dublin -> Civil Engineering Research Collection
Ireland -> University College Dublin -> College of Engineering & Architecture
Ireland -> University College Dublin -> Critical Infrastructure Group
Ireland -> University College Dublin -> School of Civil Engineering

Full list of authors on original publication

Eugene J. O'Brien, Arturo González, Paraic Rattigan

Experts in our system

1
Eugene J. O'Brien
University College Dublin
Total Publications: 192
 
2
Arturo González
University College Dublin
Total Publications: 106