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Forensic Investigation of Out-of-plane Vibrations in the Webs of Plate Girders

This investigation determined that the observed vibrations in a cantilevered steel-truss bridge in Cleveland, Ohio were due to the dynamic variation of the amplitude of the buckled shape of the web panels under the impact of traffic-induced live loads. It was also determined that stress caused by the vibrations was below the threshold of expected fatigue damage and that no corrective measures were required.

AASHTO, AASHTO LRFD Bridge Design Specifications, American Association of State Highway and Transportation Officials, Washington, DC, 2004. AISC, Steel Construction Manual (13th ed.), American Institute of Steel Construction, Chicago, Illinois, 2005. Salmon, C. G. and J. E. Johnson, Steel Structures: Design and Behavior, Emphasizing Load and Resistance Factor Design, (3rd Ed.), New York, New York, Harper Collins, 1990. Sivakumar, B., F. Moses, G. Fu, and M. Ghosn, NCHRP Report 575: Legal Truck Loads and AASHTO Legal Loads for Posting, Washington, D.C., 2007.
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