Novel Method for Retrofitting Superstructures and Piers in Aged Steel Railway Bridges
Publication: Journal of Bridge Engineering
Volume 22, Issue 11
Abstract
Deterioration of aging bridges is a serious problem that affects their serviceability and durability. Appropriate repair, strengthening, or replacement work should be performed on aged bridge structures to ensure they remain in good condition. A novel strengthening method using rubber-latex mortar, glass-fiber-reinforced polymer plates, lightweight rapid-hardening concrete, and reinforcement bars is proposed in this article. The strengthening method can be used to strengthen both steel railway bridge superstructures and piers. To confirm the effectiveness of the strengthening method, field tests on a short-span railway bridge and laboratory tests on longitudinal-lateral beam connections and steel piers were performed. Because the structural stiffness of aged steel structures is directly related to the fatigue performance and the seismic behavior of steel piers, the applied load versus displacement and strain responses of the test specimens were of primary interest in the tests. Strain results at key sections were experimentally measured and are reported in this paper. According to the experimental results, the present renovation method can significantly enhance the rigidity and reduce the stress levels in bridge girders, connections, and piers, resulting in the extension of the residual service life of such structures.
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Acknowledgments
The material tests on the lightweight rapid-hardening concrete and the rubber-latex mortar were performed at Taiheiyo Materials Corporation in Chiba, Japan. This research was partially supported by the Japan Iron and Steel Federation. These supports are gratefully acknowledged.
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Published In
Journal of Bridge Engineering
Volume 22 • Issue 11 • November 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Nov 28, 2016
Accepted: May 9, 2017
Published online: Aug 24, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 24, 2018
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