Moment Redistribution in EPC Continuous Curved Box Beams
Publication: Journal of Bridge Engineering
Volume 22, Issue 8
Abstract
Moment redistribution is important in the ductile design of concrete structures, but moment redistribution in externally prestressed concrete (EPC) continuous curved beams has not yet been studied. Neutral axis depth approaches to moment redistribution in current design codes are based on the test results of straight beams, which are not applicable to continuous curved beams. This paper presents experimental results for three three-span EPC curved box beam specimens, including their failure processes and modes, the strains in the reinforcement and concrete, and the full-range behavior of the neutral axis depth. The test results show that moment redistribution occurred from cracking of the specimens to their failure. The test results also reveal a significant difference in the mechanical behavior of the inner and outer sides of the specimens. A method for conversion of the neutral axis depth is proposed, and the calculated results, which are typically conservative, are compared with the test results. The test results show that flexural yielding in curved beam specimens did not induce a sudden increase in torsion before moment redistribution as the European standard would predict.
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Acknowledgments
This experimental study was sponsored by the National Natural Science Foundation of China (51208376) and the Fundamental Research Funds for the Central Universities (20123103). The authors thank the editors and reviewers for their time and effort in reviewing our manuscript.
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Published In
Journal of Bridge Engineering
Volume 22 • Issue 8 • August 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: May 26, 2016
Accepted: Jan 24, 2017
Published online: May 17, 2017
Published in print: Aug 1, 2017
Discussion open until: Oct 17, 2017
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