Enhancement of Flexural Design of Horizontally Curved Prestressed Bridges
Publication: Journal of Bridge Engineering
Volume 12, Issue 5
Abstract
In this paper, flexural behavior of horizontally curved prestressed (posttensioned) box bridges is studied by using three-dimensional and refined finite-element modeling and analysis. Bridge length, section geometry, and material properties are the same in all the models, while angle of curvature varies from 0 to . The results of analysis show that in curved bridges, stress distribution is significantly different in comparison to straight bridges. Also, the level of stresses at some locations of section width is considerably high. It is proposed to vary the distribution of the prestressing tendons across section width in order to optimize the bridge capacity. Results show that by proper redistribution of prestressing in section width, significant reduction in resultant stress is possible.
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Acknowledgments
The writers greatly appreciate the support provided by the Center of Excellence in Structures and Earthquake Engineering (CESEE) at Sharif University of Technology for conducting this research project. Special thanks are also extended to Dr. K. Emad for reviewing the manuscript.
References
AASHTO. (1993). Guide specifications for horizontally curved highway bridges, Washington, D.C.
AASHTO. (1996). Standard specifications for highway bridges, 16th Ed., Washington, D.C.
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ANSYS. (2002). ANSYS 7.0 manual, a general finite element program.
Davidson, J. S. (1996). “Nominal bending and shear strength of horizontally curved steel I-girder bridges.” D.Phil. dissertation, Auburn Univ., Auburn, Ala.
Song, S., Chai, Y. H., and Hida, S. E. (2003). “Live-load distribution factors for concrete box-girder bridges.” J. Bridge Eng., 8(5), 273–280.
Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 12 • Issue 5 • September 2007
Pages: 585 - 590
Copyright
© 2007 ASCE.
History
Received: Sep 13, 2004
Accepted: Sep 18, 2006
Published online: Sep 1, 2007
Published in print: Sep 2007
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