Uncertainty Analysis of Creep and Shrinkage Effects in Long-Span Continuous Rigid Frame of Sutong Bridge
Publication: Journal of Bridge Engineering
Volume 16, Issue 2
Abstract
The long-term behavior of long-span prestressed concrete continuous rigid-frame bridges is significantly sensitive to creep and shrinkage. Therefore, it is important to accurately estimate creep and shrinkage effects. This paper presents modified prediction models that are based on the creep and shrinkage models in the existing bridge code. These modified prediction models match well with the test results of the high-strength concrete used in the continuous rigid frame of the Sutong Bridge in China. Results indicate that the accuracy in predicting creep and shrinkage can be enhanced greatly by measuring short-term creep and shrinkage on the given concrete and by modifying the prediction model parameters accordingly. Subsequently, the probabilistic analysis method of structural creep and shrinkage effects was studied. Uncertainty analysis of time-dependent effects in the given bridge was performed using the modified model, and results were compared with field-test data. Two approaches for mitigating deflections that were used in the continuous rigid frame of the Sutong Bridge are introduced. Finally, the time-dependent deflection at the midspan attributable to creep and shrinkage was analyzed.
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Acknowledgments
This research work was conducted mainly at the Southeast University, China, sponsored by the Headquarters of Sutong Bridge, and finalized at the University of Maryland, College Park, Maryland. The authors acknowledge the funding support of Research Plan of Transportation Science in Jiangsu Province of China (Grant No. UNSPECIFIED05y02) and the BEST Center, University of Maryland. The authors would like to thank Prof. Zhitao Lü and Prof. Zhao Liu of the Department of Civil Engineering, Southeast University, for their advice and the design engineers of the studied bridge in CCCC Highway Consultants Co., Ltd.
References
American Concrete Institute (ACI). (1992). “Prediction of creep, shrinkage and temperature effects in concrete structures.” ACI Manual of Concrete Practice, Part 1, ACI209R-92, Detroit.
AASHTO. (2007). LRFD bridge design specifications, 4th Ed., Washington, DC.
Ang, H. S., and Tang, W. H. (1975). “Basic principles.” Probability concepts in engineering planning and design, Vol. 1, Wiley, New York.
Bazant, Z. P., and Baweja, S. (1995a). “Creep and shrinkage prediction model for analysis and design of concrete structures—Model B3.” Mater. Struct., 28(6), 357–365.
Bazant, Z. P., and Baweja, S. (1995b). “Justification and refinements of model B3 for concrete creep and shrinkage. 1: Statistics and sensitivity.” Mater. Struct., 28(7), 415–430.
Bazant, Z. P., and Baweja, S. (1995c). “Justification and refinements of model B3 for concrete creep and shrinkage. 2: Updating and theoretical basis.” Mater. Struct., 28(8), 488–495.
Bazant, Z. P., Li, G., and Yu, Q. (2008). “Explanation of excessive long-time deflections of collapsed record-span box girder bridge in Palau.” Proc., 8th Int. Conf. on Creep, Shrinkage and Durability of Concrete and Concrete Structures, T. Tanabe et al., eds., The Maeda Engineering Foundation, Ise-Shima, Japan, 1–31.
Bazant, Z. P., and Liu, K. L. (1985). “Random creep and shrinkage in structures: Sampling.” J. Struct. Eng., 111(5), 1113–1134.
China Zhongtie Major Bridge Engineering Group. (2007). Rep. of Construction Control of Continuous Rigid Frame of Sutong Bridge, Wuhan, China (in Chinese).
Comité Euro-International du Béton (CEB). (1990). CEB-FIP model code for concrete structures, Lausanne, Switzerland.
Gardner, N. J., and Lockman, M. J. (2001). “Design provisions for drying shrinkage and creep of normal-strength concrete.” ACI Mater. J., 98(2), 159–167.
Gardner, N. J., and Zhao, J. W. (1993). “Creep and shrinkage revisited.” ACI Mater. J., 90(3), 236–246.
Madsen, H. O., and Bazant, Z. P. (1983). “Uncertainty analysis of creep and shrinkage effects in concrete structures.” ACI Journal, 80(2), 116–127.
McKay, M. D., Beckman, R. J., and Conover, W. J. (1979). “A comparison of three methods for selecting values of input variables in the analysis of output from a computer code.” Technometrics, 21(2), 239–245.
Ministry of Communications of China. (2004). Code for design of highway reinforced concrete and prestressed concrete bridges and culverts, JTG D62-2004, Beijing (in Chinese).
Reinhardt, H. W., Pat, M., and Wittmann, F. H. (1982). “Variability of creep and shrinkage of concrete.” Proc., Symp. on Fundamental Research on Creep and Shrinkage of Concrete, M. Nijhoff, Hague, The Netherlands, 75–94.
Takács, P. F. (2002). “Deformation in concrete cantilever bridges: Observations and theoretical modeling.”Ph.D. thesis, Norwegian Univ. of Science and Technology, Tronheim, Norway.
Yang, I. H. (2007). “Uncertainty and sensitivity analysis of time-dependent effects in concrete structures.” Eng. Struct., 29(7), 1366–1374.
Zhan, J., and Chen, H. (2005). “Analysis of causes of excessive deflections and cracking of box girder in long-span continuous rigid-frame bridges.” J. China Foreign Highw., 25(1), 56–58 (in Chinese).
Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 16 • Issue 2 • March 2011
Pages: 248 - 258
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 26, 2009
Accepted: Jun 10, 2010
Published online: Jun 15, 2010
Published in print: Mar 1, 2011
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