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Abstract

For large-span semi-floating system single-tower hybrid girder cable-stayed bridges, the cable force of the side span is generally greater than that of the main span during construction to prevent the main tower from pre-deviating toward the side span to resist the adverse effects of vehicle loads and other variable effects after the bridge is completed. Meanwhile, after the temporary consolidation is released, the unbalanced cable force will cause longitudinal drift of the main girders. After the bridge closure, the paving of the bridge deck system and vehicle load action will also generate new unbalanced horizontal force on the main girder, causing longitudinal drift of the main girders. To study the influence of longitudinal drift on tower deviation, elevation, cable force, and stress of a single-tower hybrid girder cable-stayed bridge, this paper adopted the finite element method and BDCMS software to calculate and analyze the Jiangwan Bridge in Shaoguan, Guangdong. The calculation results show that for a semi-floating system single-tower hybrid girder cable-stayed bridge, the main girder has a certain degree of longitudinal drift in the conditions of the system conversion, paving bridge deck system, and main span arrangement of vehicle loads. Longitudinal drift has a significant influence on the tower top deviation, but a certain influence on the elevation of the main girder and cable-stayed cable force, with a relatively small effect exerted on the stress of the main girder. In longitudinal drift calculation of the main girders, the friction of bearing should be considered, otherwise it may cause distortion or excessive error in the calculation results.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.010

First Page

58

Last Page

62

Submission Date

May 2025

Reference

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