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.
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© 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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