Long-term deformation behavior and hanger force adjustment scheme of a prestressed concrete continuous rigid-frame arch bridge
To investigate the long-term service performance of continuous rigid-frame arch bridges, the Yanzhi River Bridge on the Xiong'an–Xinzhou Railway in China was selected as the research object. The entire construction process and long-term deformation trends were simulated using the finite-element...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025027550 |
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| Summary: | To investigate the long-term service performance of continuous rigid-frame arch bridges, the Yanzhi River Bridge on the Xiong'an–Xinzhou Railway in China was selected as the research object. The entire construction process and long-term deformation trends were simulated using the finite-element software Midas Civil, and the effects of different loading ages and casting sequences of steel-tube concrete on the long-term deformation of the bridge were comparatively analyzed. To mitigate creep-induced deflection of the main girder, a hanger force adjustment method based on the influence matrix was proposed. This method establishes mathematical relationships between adjustment values, main girder displacements, and hanger forces, followed by treating main girder deflection as a constraint and hanger forces as the objective function to determine the optimal adjustment values through a constrained nonlinear optimization algorithm. Then, the influence matrix is used to calculate the hanger forces during the adjustment process and derive a procedure that meets structural safety requirements. The results indicate that concrete shrinkage and creep lead to mid-span uplift and side-span sagging, with mid-span uplift reaching 20.3 mm after 20 years and 29.1 mm after 100 years. The loading age and the casting sequence of the steel-tube concrete exert minimal influence on this uplift. However, after applying the hanger force adjustment, the 100-year uplift is reduced to 20.0 mm, satisfying the limit of 20 mm and increasing the safety reserve of the hangers. Following optimization, all hanger forces remain below their maximum allowable values under permanent loads, ensuring the safety of the adjustment process. |
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| ISSN: | 2590-1230 |