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Abstract

Based on the research background of the construction of over 80 m tubular steel support in the bridge tower closure section of a cable-stayed bridge, the current research and application status of the support were introduced, and the necessity of the research of the ultra-high support was clarified. The finite element method calculation theory of the support stability analysis method was introduced in detail, and the finite element method was used to analyze the influence of wind load, constraint conditions, and initial defects on the stability of the tubular steel support. Based on the characteristics of the first-order buckling mode of the support, four kinds of parameter optimization schemes to improve the stability of the support were proposed and analyzed. The results show that wind load, constraints, and initial defects all affect the stability of the ultra-high support but do not affect the position of the support instability. As it gets closer to the top of the support, there is less influence of the change of constraint conditions on the stability of the support. A larger initial defect indicates a smaller critical load coefficient, but the effect of the initial defect on the critical load coefficient is limited. Among the four optimization schemes, the scheme of increasing the size of the scissor support between the unstable parts of the steel pipe column is more effective and economical than the other three schemes, and the stability of the support can be increased by about 47.8%.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.026

First Page

142

Last Page

148

Submission Date

May 2025

Reference

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