Quantitative Design of Backup Prestressing Tendons for Long-Span Prestressed Concrete Box Girder Bridges
Publication: Journal of Bridge Engineering
Volume 20, Issue 3
Abstract
Excessive deflections unexpected at the midspan have commonly appeared in long-span prestressed concrete box girder bridges, mainly because of the high degree of uncertainty in concrete creep and shrinkage, prestress loss, and variations in the environment. Arrangement of backup prestressing tendons that will be tensioned based on deflection development during the service years is an effective solution to this problem. First, an uncertainty analysis of the long-term deformation at the midspan of a bridge was performed using the Latin hypercube sampling method, with the consideration of model uncertainty of creep and shrinkage and random properties of influencing factors; consequently, the 95% confidence interval of the deformation at the midspan was determined. Then, a quantitative design of backup tendons was performed on the basis of the difference between the lower limit and mean value of the 95% confidence interval of deformation. Lastly, the efficiencies of different arrangement schemes of backup tendons were compared, and results show that arrangement of combined external tendons along the girder is the most effective measure for control of long-term deflection.
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Acknowledgments
The authors acknowledge the funding supports of the Research Plan of Transportation Science in Jiangsu Province of China (Grant No. 05Y02) and the Doctoral Program of the Ministry of Education of China (Grant No. 20120092110014). The authors thank Professor Zhitao Lu, Professor Zhao Liu, and Professor Shaoping Meng of the School of Civil Engineering, Southeast University, China, for their advice and the design engineers of the studied bridge in CCCC Highway Consultants Co., Ltd.
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Published In
Journal of Bridge Engineering
Volume 20 • Issue 3 • March 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 7, 2013
Accepted: May 8, 2014
Published online: May 29, 2014
Published in print: Mar 1, 2015
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