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Semi-analytical determination of natural frequencies and mode shapes of multi-span bridge decks
Author(s)
Date Issued
2009-12
Date Available
2012-04-10T15:50:02Z
Abstract
The determination of the natural frequencies and mode shapes of structures requires an analytical, semi-analytical or numerical method. This paper presents a new semi-analytical approach to determine natural frequencies and mode shapes of a multi-span, continuous, orthotropic bridge deck. The suggested approach is based on the modal method, which differs from other approaches in its decomposition of the admissible functions defining the mode shapes. Implementation of this technique is simple and enables avoidance of cumbersome mathematical calculations. In this paper, application of the semi-analytic approach to a three-span, orthotropic roadway bridge deck is compared in the first 16 modes of previously published fully analytical results and to a finite element method analysis. The simplified implementation matches within 2 % in all cases, with the additional benefit of including intermodal coupling. The approach can be extended to similar bridges with more than three spans.
Sponsorship
Not applicable
Type of Material
Journal Article
Publisher
Elsevier
Journal
Journal of Sound and Vibration
Volume
328
Issue
3
Start Page
291
End Page
300
Copyright (Published Version)
2009 ElsevierLtd.
Subject – LCSH
Structural dynamics
Bridges--Vibration
Long-span bridges
Web versions
Language
English
Status of Item
Peer reviewed
ISSN
0022-460X
This item is made available under a Creative Commons License
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