Fatigue-Based Methodology for Managing Impact of Heavy-Permit Trucks on Steel Highway Bridges
Publication: Journal of Structural Engineering
Volume 121, Issue 11
Abstract
Currently, in many areas of North America, special permits are issued to extra heavy vehicles without a detailed evaluation of individual components, considering only the ultimate capacity of the bridge inventory as a whole. Based on this, a large number of special permits have been issued to extra heavy vehicles. In this perspective, the ultimate and cumulative effect of such overloads on steel bridge components is studied. It is found that steel bridge members have adequate ultimate capacity to accommodate such overloads; however, they may suffer fatigue damage due to the cumulative effect of these overloads. Accordingly, a fatigue-based methodology is developed to assess the reduction in service life of bridges due to heavy-permit trucks. It is found that a reasonably large number of special permits can be issued at small reductions in fatigue life, but because stress ranges in excess of the constant-amplitude fatigue limit significantly alter the shape of the S - N curve, it is essential to appreciate that the concept of infinite fatigue life cannot be relied upon anymore.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 121 • Issue 11 • November 1995
Pages: 1651 - 1659
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Nov 1, 1995
Published in print: Nov 1995
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