Rotation Compatibility Approach to Moment Redistribution for Design and Rating of Steel I-Girder Bridges
Publication: Journal of Bridge Engineering
Volume 15, Issue 1
Abstract
Recent research has culminated in the development of moment redistribution design and rating procedures based on a “rotation compatibility” procedure. The key aspects of the rotation compatibility method are presented herein along with the resulting series of simple equations that may be used for both design and rating of straight continuous-span steel I-girders. This procedure has several advantages over the previous moment redistribution procedures. Most significantly, the rotation compatibility method provides a rational basis for removing the current restrictions on girder geometries permissible for use with moment redistribution provisions. Thus, sections that are more slender and/or have greater unbraced lengths, compared to previous inelastic procedures, may be considered. This is particularly beneficial for incorporating inelastic methods into rating specifications because many existing bridges have geometries such that they have previously been outside the scope of applicability of inelastic procedures. A second key advantage of the rotation compatibility procedure is that maximum allowable redistribution moments are specifically computed, which justifies the use of higher levels of moment redistribution and consequently greater design economy in some cases.
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Acknowledgments
Funding for this work was provided by the UNSPECIFIEDWest Virginia Division of Highways and is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 15 • Issue 1 • January 2010
Pages: 55 - 64
Copyright
© 2010 ASCE.
History
Received: Aug 20, 2007
Accepted: Jul 27, 2009
Published online: Dec 15, 2009
Published in print: Jan 2010
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