Characterization of Material Properties of HPS-485W (70 W) TMCP for Bridge Girder Applications
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Volume 11, Issue 1
Abstract
There are currently two methods of production for A 709 Grade HPS-485W (70 W)—quenching and tempering (Q&T) and thermomechanical controlled processing (TMCP). The TMCP enables plates to be rolled in longer lengths than is possible with Q&T; however, because of its recent introduction and a lack of material testing, relatively little is known concerning the effect of this new production method upon the intraplate variability of both tensile strength and toughness. Data from 96 tensile tests show that yield and ultimate strengths of HPS-485W (70 W) TMCP may be dependent upon plate thickness and orientation. The average yield strength was found to be lower than the 485 MPa (70 ksi) limit, while the average ultimate strength was within acceptable limits. Seventy-five Charpy V-Notch (CVN) specimens were tested, and all met the 48 J at 23°C (35 ft-lb at 10°F) AASHTO Zone III requirement for minimum toughness. Overall it was seen that HPS 485W (70 W) TMCP shows promise for bridge girder applications, but thicker plates do not currently meet all the ASTM A 709 standards, and should be reevaluated before being used in bridge construction on a large scale.
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Acknowledgments
The writers would like to acknowledge the Ohio Department of Transportation (ODOT) and the Innovative Bridge Research Council (IBRC) program sponsored by the Federal Highway Administration (FHWA) for their ongoing cooperation and funding of this project. The writers would also like to thank Eric Dues, John Hattin, and Sarita Kesler for their dedication and performing much of the testing discussed in this paper, made possible by funding from the National Science Foundation (NSF)NSF.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 11 • Issue 1 • January 2006
Pages: 99 - 108
Copyright
© 2006 ASCE.
History
Received: Jun 11, 2004
Accepted: Dec 15, 2004
Published online: Jan 1, 2006
Published in print: Jan 2006
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