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Evaluation of flange bending stresses in non-composite steel I-girder bridges during construction

Evaluation of flange bending stresses in non-composite steel I-girder bridges during construction Exterior girders undergo direct torsional effects applied by deck forming brackets during construction. During this phase while these members are not composite, these effects are counteracted by internal lateral forces developed primarily in the flanges that modify the major-axis bending stresses produced by vertical loads. In curved and skewed bridges, additional lateral flange bending is introduced due to the eccentricity of the loads with respect to the supports and differential displacements. In this paper, approximate equations are proposed from a parametric study to estimate the lateral flange bending in continuous straight, skewed and curved bridges during the deck placement. The proposed equations were found to be less conservative than AASHTO approximate equations. For curved bridges, the major-axis bending was also approximated in terms of the curvature. The results showed that the variable that most affects the limit states for constructibility is the curvature, followed by the cross-frame spacing to a lesser degree. Conversely, for the girders evaluated in this work through the range of parameters studied, the limit states were not found to be sensitive to skew angle. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bridge Structures IOS Press

Evaluation of flange bending stresses in non-composite steel I-girder bridges during construction

Bridge Structures , Volume 5 (4) – Jan 1, 2009

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Publisher
IOS Press
Copyright
Copyright © 2009 by IOS Press, Inc
ISSN
1573-2487
eISSN
1744-8999
DOI
10.1080/15732480903142492
Publisher site
See Article on Publisher Site

Abstract

Exterior girders undergo direct torsional effects applied by deck forming brackets during construction. During this phase while these members are not composite, these effects are counteracted by internal lateral forces developed primarily in the flanges that modify the major-axis bending stresses produced by vertical loads. In curved and skewed bridges, additional lateral flange bending is introduced due to the eccentricity of the loads with respect to the supports and differential displacements. In this paper, approximate equations are proposed from a parametric study to estimate the lateral flange bending in continuous straight, skewed and curved bridges during the deck placement. The proposed equations were found to be less conservative than AASHTO approximate equations. For curved bridges, the major-axis bending was also approximated in terms of the curvature. The results showed that the variable that most affects the limit states for constructibility is the curvature, followed by the cross-frame spacing to a lesser degree. Conversely, for the girders evaluated in this work through the range of parameters studied, the limit states were not found to be sensitive to skew angle.

Journal

Bridge StructuresIOS Press

Published: Jan 1, 2009

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