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Abstract

The equilibrium differential equation of the longitudinal direction of a suspension bridge tower was established by using the static method, and the stability equation under vertical critical load was obtained by introducing the relevant boundary conditions. It is a transcendental equation concerning the effective length coefficient μ of the bridge tower and the ratio n of the longitudinal constraint stiffness of the tower top to the anti-thrust stiffness of the bridge tower. A calculation program was developed to obtain the numerical solution of the effective length coefficient of the bridge tower under different stiffness ratios, and a calculation table for design was made, with the simplified calculation formula fitted. It could be applied to the checking calculation of the bearing capacity of the suspension bridge tower under construction and completion and the force analysis of the compression column under similar constraints. The calculation results show that the cable system of the suspension bridge can greatly improve the longitudinal stability of the bridge tower. The longitudinal effective length coefficient of the bridge tower in the empty cable state is below 0.9, and the longitudinal effective length coefficient of the bridge tower in the completed bridge state is close to 0.7.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.023

First Page

126

Last Page

130

Submission Date

May 2025

Reference

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