Safety Monitoring and Effect Evaluation of Variable Cross-Section Continuous Box-Girder Bridges Strengthened with External Prestressing
Publication: Journal of Performance of Constructed Facilities
Volume 37, Issue 2
Abstract
External prestressing technology has been widely applied to mitigate the cracking and deflection of variable cross-section continuous box-girder bridges. However, it remains a challenging task to establish a reliable safety monitoring and evaluation method in engineering applications. This paper takes a practical project as the research background and installs a sensing monitoring system on a bridge before strengthening. The evolutions of the strain at the characteristic sections, crack width, and deflection of bridges before and after strengthening were compared and analyzed. The construction process’s safety and strengthening measures’ effectiveness were monitored and evaluated. According to the construction process monitoring, the prestress tensioning process did not bring torsion to the bridge, and the strain at each monitoring point was within safe boundaries. After strengthening, the bridge appeared to camber with a value of . The typical cracks were mitigated to different extents, and the closure degree of the crack width was . The strain distribution of the bridge was more stable after strengthening, and the frequency of large strain was significantly reduced, which reflected the improvement of section stiffness. The study can provide meaningful references for the optimization design and strengthening strategies of similar projects.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully appreciate the financial support of the National Natural Science Foundation of China (52078122).
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Published In
Journal of Performance of Constructed Facilities
Volume 37 • Issue 2 • April 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jul 4, 2022
Accepted: Oct 27, 2022
Published online: Dec 24, 2022
Published in print: Apr 1, 2023
Discussion open until: May 24, 2023
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