Moment Redistribution in Segmental Cantilever Bridges: Simplified Approach
Publication: Practice Periodical on Structural Design and Construction
Volume 25, Issue 3
Abstract
Moment redistribution due to creep of concrete in cast-in-place segmental cantilever bridges can be accounted for with sophisticated software. Although this approach to design frequently is preferred, experienced engineers often do a final check based on hand calculations that have stood the test of time. This paper deals with the latter approach. Principles governing moment redistribution due to creep were revised, and results from this investigation were used to develop a novel graphical aid suitable for hand calculations in an attempt to estimate the magnitude of tensile stresses due to moment redistribution because of creep. It was found that tension stresses due to creep are not likely to exceed 2 MPa (290 psi) because the post-tensioning provided by top cables balance approximately 70%–85% of the bending moments due to concrete weight. An example for routine designs was provided.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (data used to generate plots and all other data).
Acknowledgments
The authors thank Daris Zurita, Laura Davila, and Henry Wolf for help with the preparation of the manuscript.
References
AASHTO. 2012. AASHTO LRFD bridge design specifications. Washington, DC: AASHTO.
ACI (American Concrete Institute). 1982. Prediction of creep, shrinkage and temperature effects in concrete structures. ACI Committee 209. Farmington Hills, MI: ACI.
Bažant, Z. P., and S. Baweja. 2000. Creep and shrinkage prediction model for analysis and design of concrete structures: Model B3. Farmington Hills, MI: ACI.
CEB-FIP (International Federation for Structural Concrete). 1978. CEB-FIP model code for concrete structures. Paris: CEB-FIP.
CEB-FIP (International Federation for Structural Concrete). 1993. CEB-FIP model code 1990. London: Thomas Telford.
Collins, M. P., and D. Mitchell. 2003. Prestressed concrete structures. Toronto: Response.
Hewson, N. R. 2006. Prestressed concrete bridges design and construction. London: Thomas Telford.
Mathivat, J. 1983. The cantilever construction of prestressed concrete bridges. Chichester, UK: Wiley.
Naaman, A. E. 2005. Prestressed concrete analysis and design fundamentals. Ann Arbor, MI: Techno.
Podolny, J. W., and J. M. Muller. 1982. Construction and design of prestressed concrete segmental bridges. New York: Wiley.
Sozen, M. A., T. Ichinose, and S. Pujol. 2014. Principles of reinforced concrete design. Boca Raton, FL: CRC Press.
Tang, M. 2014. The story of the Koror Bridge. Zürich, Switzerland: Case Studies, International for Bridge and Structural Engineering.
Wight, J. K. 2012. Reinforced concrete, mechanics and design. Englewood Cliffs, NJ: Prentice Hall.
Information & Authors
Information
Published In
Practice Periodical on Structural Design and Construction
Volume 25 • Issue 3 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Oct 8, 2019
Accepted: Jan 2, 2020
Published online: Apr 24, 2020
Published in print: Aug 1, 2020
Discussion open until: Sep 24, 2020
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