Impact factors for a composite steel ebridge using non-linear dynamic simulation

Moghimi,Hassan and Ronagh, Hamid R. (2008) Impact factors for a composite steel ebridge using non-linear dynamic simulation. International Journal of Impact Engineering, 35 11: 1228-1243. doi:10.1016/j.ijimpeng.2007.07.003

Author Moghimi,Hassan
Ronagh, Hamid R.
Title Impact factors for a composite steel ebridge using non-linear dynamic simulation
Journal name International Journal of Impact Engineering   Check publisher's open access policy
ISSN 0734-743X
Publication date 2008-11-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.ijimpeng.2007.07.003
Open Access Status DOI
Volume 35
Issue 11
Start page 1228
End page 1243
Total pages 16
Editor N. Jones
Place of publication United Kingdom
Publisher Pergamon
Language eng
Subject C1
87 Construction
0905 Civil Engineering
Abstract Traditionally, bridges are designed using static loads that arc increased by the dynamic load allowance (DLA) factor (or dynamic amplification factor). The DLA factor is a function of span or first flexural natural frequency of the bridge, and indirectly incorporates the dynamic effects of moving vehicles in the design. This article firstly reviews the literature on impact loading of bridge decks. Analytical methods published previously are evaluated and the bridge-vehicle interaction is found to be the most reliable method among them. The article then presents a 3D finite element model to study the bridge-vehicle interaction. Finite elements are developed to simulate the trucks, the road surface and the composite girder bridge itself. Truck parameters include the body, suspension and tires, with variables being the total weight and the speed. The bridge superstructure is treated as a 3D composite steel girder bridge incorporating special end springs that simulate the elastomeric bearings. A parametric study is performed to identify the effect of various parameters on DLA, such as vehicle speed, aspect ratio of steel girders, stiffness of neoprene, type of vehicle, vehicle lane eccentricity and initial bounce of the vehicle due to road surface roughness. The results indicate that (lie DLA is correlated well with the velocity of the truck, especially at high speed. DLA is vehicle dependent and the dynamic and static live loads can be considered uncorrelated, except when the truck weight is less than 10 percent of the total deck weight, for which a low degree of correlation is observed. The DLA is decreased as the vehicle lane eccentricity (with respect to the deck centerline) is increased, and the same relationship exists with the bridge span length. No distinctive correlation is observed between the DLA and the initial bounce of vehicle at the time of entrance to span. Crown Copyright (C) 2007 Published by Elsevier Ltd. All rights reserved.
Keyword bridge vehicle interaction
dynamic load simulations
dynamic load allowance
impact factor
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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Created: Fri, 27 Mar 2009, 20:11:35 EST by Katherine Montagu on behalf of School of Civil Engineering