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Abstract

In order to investigate the stress and fatigue performance of nuts in the tie rod assembly of the anchorage system of a long-span suspension bridge,the finite element software Ansys and Abaqus were used to establish the full bridge model and the local finite element models of the tie rod and the hexagonal nut,respectively.Secondly,the whole process variation law of the synergistic force of the tie rod and the nut under the axial tensile load was revealed.The difference in mechanical performance between slotted nuts and unslotted nuts was compared,and the detailed structural parameters of slotted nuts were optimized.Finally,the static tensile and fatigue load tests of the nut in the tie rod assembly were performed,and the failure mechanism and damage mode of the nut in the tie rod assembly were revealed.The results show that the finite element numerical simulation method proposed in this paper is reliable,and slotting can reduce the stress concentration effect at nut ends.There is an optimal scheme in the three slotting size parameter design schemes.There is no damage to the tie rod assembly under static tensile load.The fracture failure of the tie rod is the main failure feature under fatigue load.The slotted nut has better mechanical performance and can meet the design requirements of 2-million fatigue life.

Publication Date

2-22-2025

DOI

10.14048/j.issn.1671-2579.2025.01.014

First Page

119

Last Page

128

Submission Date

March 2025

Reference

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