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Abstract

To investigate the stability problems frequently arising in the push-from-the-rear incremental launching construction of steel box girders of curved ramp bridges, this study took the steel box girder project of the Qingshui Bridge Hub ramp bridge as the engineering background. A finite element model of the curved ramp girder‒launching nose‒support system was first established using Midas Civil. The model's validity was verified with monitoring data of incremental launching force, stress in the girder, and axis deviation from the actual incremental launching process. Subsequently, based on the validated model, the study analyzed the mechanical properties of the steel box girder of the curved ramp bridge under four typical incremental launching conditions, confirming the safety and feasibility of the push-from-the-rear incremental launching scheme. Furthermore, three potential risk factors—axis deviation, support uplift, and asynchronous incremental launching—were investigated, and corresponding integrated stability control measures were proposed. The results demonstrate that the stresses and deformations in the ramp girder and launching nose system and supports under the four typical incremental launching working conditions meet construction requirements. The overall stability coefficient of the incremental launching system of the ramp bridge exhibits negative correlations with both axis deviation and asynchronous incremental launching rates. Among the three risk factors, support uplift is the most critical, with edge support uplift having the most significant adverse impact on structural stability. Additionally, the coupling effect of vibrations and static deviations further reduces system stability. The proposed triple-factor stability control method effectively addresses the overall stability problem facing the steel box girder of the curved ramp bridge during the push-from-the-rear incremental launching process. This study provides a closed-loop risk early warning and control analysis methodology—integrating verification, warning, and control—for similar push-from-the-rear incremental launching projects of curved steel box girders.

Publication Date

8-16-2026

DOI

10.14048/j.issn.1671-2579.2026.04.014

First Page

125

Last Page

136

Submission Date

August 2026

Reference

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