Effect of Skewness on the Distribution of Live Load Reaction at Piers of Skewed Continuous Bridges
Publication: Journal of Bridge Engineering
Volume 13, Issue 1
Abstract
This paper presents a study of the skewness effect on live load reactions at the piers of continuous bridges. Two prestressed concrete I-beam bridges and one steel I-girder bridge were selected for the study. To evaluate the skew effect, the skew angle of the bridges was varied from 0 to . Live load reaction at support and shear at the beam ends of the selected bridges were determined using finite-element analysis. The comparison of the distribution factors of live load reactions and shear revealed that the distribution factor of reaction at piers was higher than that of shear at beam ends near the same support. The increase in the reaction distribution factor was more significant than that in the shear distribution factor in the interior beam line when the skew angle was greater than . The LRFD shear equations and the Lever rule method could conservatively predict live load reaction distribution for piers in exterior beam lines but underestimate live load reaction distribution in interior beam lines. It is recommended that more research be performed for the distribution factor of live load reaction to quantify the responses.
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References
AASHTO. (1994). Guild specifications for distribution of loads for highway bridges, Washington, D.C.
AASHTO. (2004). AASHTO LRFD bridge design specifications, 3rd ed., Washington, D.C.
Huo, X. S., and Zhang, Q. (2006). “The effect of skewness on live load reactions at piers of continuous bridges.” Proc., Structures Congress 2006, ASCE, Reston, Va.
Modjeski and Masters, Inc. (2002). “Shear in skewed multibeam bridges.” National Cooperative Highway Research Project 20-7/Task 107, Harrisburg, Penn.
Tennessee Department of Transportation. (1996). “Lateral distribution of structural loads.” Tennessee Structures Memorandum 043, Nashville, Tenn.
Information & Authors
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Published In
Journal of Bridge Engineering
Volume 13 • Issue 1 • January 2008
Pages: 110 - 114
Copyright
© 2008 ASCE.
History
Received: Aug 24, 2006
Accepted: Dec 28, 2006
Published online: Jan 1, 2008
Published in print: Jan 2008
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