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Abstract

To ensure that the alignment and internal forces of the cable-stayed arch-type bridge towers meet the design requirements and achieve safe construction of the bridge towers, this paper built a finite element model to study the variation rules of the alignment and stress during the construction of arch-type bridge towers, analyzing the influence of temperature effects on the arch-type bridge towers, with relevant control measures proposed. The results indicate that when the temperature gradient in the transverse direction of the bridge is only considered, under the same temperature gradient, the tensile stress of the outer tower limbs affected by sunlight is greater than that of the inner tower limbs, and the displacement of the tower limbs on both sides is the same and consistent with the sunlight direction. During the construction stage of the lower crossbeam and the closure stage of the bridge tower, the temperature effect on the bridge tower decreases. Additionally, the setting of the temporary lateral bracing, application of jacking force, and setting of the offsetting amount can reduce the axial displacement of tower limbs and tensile stress of tower limbs during construction, avoiding bridge tower cracking. After the jacking force application of the lateral bracing, the axial displacement of the bridge tower can be controlled within 5 mm. When two pieces of lateral bracing are set up, the removal sequence of temporary lateral bracing may not be considered. By comparing measured and theoretical data, it has been further verified that the setting of temporary lateral bracing and application of jacking force can effectively decrease the deviation of the bridge tower axis, with significant influence of the temperature gradient exerted on the alignment and stress of bridge towers.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.022

First Page

140

Last Page

148

Submission Date

March 2025

Reference

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