Steel Girder Stability during Bridge Erection: AASHTO LRFD Check on Ratios
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VIEW THE REPLYPublication: Journal of Bridge Engineering
Volume 15, Issue 6
Abstract
The erection of steel plate girders during the construction process of a steel bridge is a complex operation, which is often left to the contractor and/or the subcontractor to plan and execute. Rules of thumb have been developed through experience to check the lateral torsional buckling of the steel girder during erection using the maximum (unbraced length/compressive flange width) ratio, below which no lateral torsional buckling would occur. Although the ratio check has proven to be useful and convenient on-site, it is necessary to provide a more rational basis for the rules of thumb, and find the maximum ratios by checking the lateral torsional buckling failure of girders under erection according to the latest AASHTO LRFD code. A series of parametric studies were conducted on cantilever and simply supported girders under self-weight as well as self-weight plus wind load, in order to: (1) check the rules of thumb on ratios and (2) determine the effects of girder flange width, flange thickness, web depth, web thickness, and yield strength on the maximum ratio and girder stability during erection. From the results, rules of thumb were modified for girders with common shapes, and it was obvious that (1) self-weight plus wind load controls the girder stability during erection in most cases and (2) flange width and web depth have the most effects on the maximum ratio and girder stability during erection.
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References
AASHTO. (2007). LRFD bridge design specifications, 4th Ed., Washington, D.C.
American Bridge Division. (1983). Handbook for construction engineers, United States Steel Corporation, Pittsburgh.
ASCE. (2005). Minimum design loads for buildings and other structures, Reston, Va.
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© 2010 ASCE.
History
Received: Jun 6, 2008
Accepted: Jan 19, 2010
Published online: Jan 22, 2010
Published in print: Nov 2010
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