Superload Evaluation of the Bonnet Carré Spillway Bridge
Publication: Journal of Performance of Constructed Facilities
Volume 22, Issue 4
Abstract
The passage of overloads that require special permitting is a common occurrence. Prior to the passage of such an overload, a simplified computer analysis is generally conducted to predict the expected behavior of the bridge. This paper addresses the field evaluation of three superloads that crossed the Bonnet Carré Spillway Bridge in Louisiana. Emphasis is placed on comparisons between the expected and actual behavior due to rotational restraint, live load distribution, the stiffening effect of bridge rails, and other factors. Finite-element modeling was conducted and the approach taken along with the results obtained are described. One important conclusion was that the longitudinal configuration of the axle loads supplied by the hauler was configured differently than indicated on the permit. While the gross load was accurate, the distribution between sets of axles varied considerably from those assumed in the permitting process. To minimize the potential for damage to bridges it is therefore recommended that axle loads be weighed prior to the passage of such overloads.
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Acknowledgments
This effort was sponsored by the Louisiana Transportation Research Center (LTRC) and the Louisiana Department of Transportation and Development (LADOTD) and their support is greatly appreciated. Special thanks are expressed to Arthur D’Andrea of LADOTD for technical input and coordination of the snooper truck and Superloads crossings. Dr. Robert Bruce of Tulane University, Paul Fossier of LADOTD, and Walid Alaywan of the LTRC assisted with the monitoring effort for Superload 1 and their input is likewise appreciated. Tom Cole and Anthony Lamanna were instrumental in the field evaluation of Superload 1. The views expressed are those of the writers and do not necessarily reflect those of the LADOTD or LTRC.
References
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 22 • Issue 4 • August 2008
Pages: 253 - 263
Copyright
© 2008 ASCE.
History
Received: May 8, 2007
Accepted: Mar 31, 2008
Published online: Aug 1, 2008
Published in print: Aug 2008
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