Structural Assessment of Concrete Cable-Stayed Bridge after Replacement of Closure Segment: The Service Stage
Publication: Practice Periodical on Structural Design and Construction
Volume 25, Issue 3
Abstract
To deal with failure in the closure segment in an existing concrete cable-stayed bridge, a new strengthening method, called the replacement of closure segment (RCS), has emerged in recent years in China. Basically, the construction process of RCS includes removing the failed closure segment, then constructing a new one, and finally improving the connection between the new closure segment and the original and residual part of the main girder by some strengthening measures. To assess the concrete cable-stayed bridge strengthened by RCS, a field loading test was implemented, and several structural indexes were investigated, including deflection of the bridge deck, horizontal displacement of pylons, concrete stress of critical sections in the main girder, and natural vibration characteristics. The results show that the concrete cable-stayed bridge after RCS behaves very well. The measured values of these structural indexes are very consistent with the analytical ones and tend to be safer. Thus, the strength and stiffness of the bridge structure after RCS can satisfy the load-carrying capacity and serviceability requirements specified in its original design. RCS opens up a new way and provides a beneficial exploration for strengthening existing concrete cable-stayed bridges during their use lifetime.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The study presented in this paper was sponsored by the Fundamental Research Funds for the Central Public Welfare Research Institutes (Grant 2018-9021). The financial supports are gratefully acknowledged. The author also thanks all bridge engineers for their work in the retrofit design and field data acquisition of the Yonghe Bridge.
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Published In
Practice Periodical on Structural Design and Construction
Volume 25 • Issue 3 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Dec 3, 2019
Accepted: Mar 20, 2020
Published online: Jun 8, 2020
Published in print: Aug 1, 2020
Discussion open until: Nov 8, 2020
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