Impact Factors for Curved Continuous Composite Multiple-Box Girder Bridges
Publication: Journal of Bridge Engineering
Volume 12, Issue 1
Abstract
The results from a parametric study on the impact factors for 180 curved continuous composite multiple-box girder bridges are presented. Expressions for the impact factors for tangential flexural stresses, deflection, shear forces and reactions are deduced for AASHTO truck loading. The finite-element method was utilized to model the bridges as three-dimensional structures. The vehicle axle used in the analysis was simulated as a pair of concentrated forces moving along the concrete deck in a circumferential path with a constant speed. The effects of bridge configurations, loading positions, and vehicle speed on the impact factors were examined. Bridge configurations included span length, span-to-radius of curvature ratio, number of lanes, and number of boxes. The effect of the mass of the vehicle on the dynamic response of the bridges is also investigated. The data generated from the parametric study and the deduced expressions for the impact factors would enable bridge engineers to design curved continuous composite multiple-box girder bridges more reliably and economically.
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Acknowledgments
This research was supported by the Natural Sciences and Engineering Council of Canada.
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Information
Published In
Journal of Bridge Engineering
Volume 12 • Issue 1 • January 2007
Pages: 80 - 88
Copyright
© 2007 ASCE.
History
Received: Dec 13, 2004
Accepted: Dec 13, 2005
Published online: Jan 1, 2007
Published in print: Jan 2007
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