End Connection Effects on Vortex Shedding Susceptibility of Welded Aluminum Truss Tubular Web Members
Publication: Journal of Performance of Constructed Facilities
Volume 22, Issue 5
Abstract
A series of experiments and analyses have been conducted to assess the vulnerability of hollow circular web members in welded aluminum sign truss structures to wind-induced resonant vibrations. Results from nondestructive field testing were used to develop and verify a reliable method for determining the fundamental natural frequency of vibration for various categories of truss web members (incorporating end connection fixity effects). These natural frequencies for different types, sizes, and lengths of web members were then related to their computed vortex-shedding frequencies, toward estimating the critical wind speeds for web member resonant vibration. Outcomes were correlated with wind-related fatigue damage observed in the field; simple design recommendations for preventing this sort of damage by limiting the maximum web member slenderness ratio have been developed.
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Acknowledgments
This work was supported by the Illinois Department of Transportation (IDOT) as part of IDOT Contract No. UNSPECIFIEDIHR-R37 (“Evaluation of Aluminum Highway Sign Truss Designs and Standards for Wind and Truck Gust Loadings”). The assistance and support of the project’s Principal Investigator, Professor Douglas A. Foutch of the University of Illinois, are greatly appreciated. The contents of this paper reflect the view of the writers, who are responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of IDOT or the Federal Highway Administration, and this paper does not constitute a standard, specification, or regulation.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 22 • Issue 5 • October 2008
Pages: 297 - 304
Copyright
© 2008 ASCE.
History
Received: Jul 19, 2007
Accepted: Nov 5, 2007
Published online: Oct 1, 2008
Published in print: Oct 2008
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