Strengthening a 20-Year-Old Post-Tensioned Concrete Box Beam with Double-Layer Prestressed Steel Wire Ropes
Publication: Journal of Bridge Engineering
Volume 23, Issue 11
Abstract
Overloading, corrosion, and material aging deteriorate the structural performance of prestressed concrete (PC) bridges. Strengthening techniques are needed to improve the serviceability and extend the life of these deteriorating bridges. This study examined a strengthening technique with double-layer prestressed steel wire ropes (PSWRs) to enhance the serviceability of an existing post-tensioned concrete box beam for the first time. The tested box beam was removed from a demolished 20-year-old bridge. The service-level behavior of the beam, before and after strengthening, was evaluated using four-point flexural loading. The enhancement effects of the double-layer PSWR on the service-level behavior of the beam are discussed, including details on deflection, crack width, and reinforcing steel stress. Results show that PSWR strengthening is a feasible method for improving the serviceability of post-tensioned concrete box beams. The restraining effect of PSWR on crack development is more significant than the effect on deflection and reinforcing steel stress. Crack width, deflection, and reinforcing steel stress under the code-specified service load decreased by 50, 23, and 21%, respectively, after strengthening.
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Acknowledgments
The work reported here was conducted with financial support from the National Natural Science Foundation of China (Grants 51678069 and 51708477) and the State Key Development Program for Basic Research of China (Grant 2015CB057705). The financial contributions of these institutions are gratefully acknowledged.
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Information & Authors
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 11 • November 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Oct 12, 2017
Accepted: May 9, 2018
Published online: Aug 22, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 22, 2019
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