Additional Shear Stresses in Webs of Segmental Concrete Bridges due to Anchorage of Cantilever Tendons
Publication: Journal of Bridge Engineering
Volume 26, Issue 7
Abstract
The balanced cantilever method is the most widely used technique for the construction of large-span segmental prestressed concrete box-girder bridges. In order to control shear cracks at the service limit state, the principal tensile stresses in the webs are analyzed for all segmental bridges. Web shear cracking may occur for a number of reasons, one of them is the ignoring of shear stresses induced by the anchorage of cantilever tendons during the cantilevering process. This study aims to provide a clear understanding of anchorage-induced shear stresses in the webs of segmental box-girder bridges, including the underlying mechanisms, mechanical models, adverse effects, and design considerations. Case studies show that the peak shear stresses in the webs might have a significant increase due to this localized effect, while it cannot be captured by the beam-element analysis and is usually not considered in the routine design. To solve this problem, a practical approach is developed for evaluating the anchorage-induced shear stresses in the webs of segmental concrete box-girder bridges.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51978161 and No. U1934205) and the Outstanding Youth Foundation of Jiangsu Province, China (No. BK20180063).
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Published In
Journal of Bridge Engineering
Volume 26 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Oct 22, 2020
Accepted: Apr 1, 2021
Published online: May 13, 2021
Published in print: Jul 1, 2021
Discussion open until: Oct 13, 2021
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