Structural Response Analysis of Tie Rod Fracture in CFST Arch Bridges Based on Field Monitoring

DENG Ming; QI Huaizhan; LI Junchi; JIN Yang; YI Ju; YUAN Ping

doi:10.3724/j.gyjzG26031901

Volume 56 Issue 5

May 2026

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2026 > 56(5): 208-214

DENG Ming, QI Huaizhan, LI Junchi, JIN Yang, YI Ju, YUAN Ping. Structural Response Analysis of Tie Rod Fracture in CFST Arch Bridges Based on Field Monitoring[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(5): 208-214. doi: 10.3724/j.gyjzG26031901

Citation:

DENG Ming, QI Huaizhan, LI Junchi, JIN Yang, YI Ju, YUAN Ping. Structural Response Analysis of Tie Rod Fracture in CFST Arch Bridges Based on Field Monitoring[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(5): 208-214. doi: 10.3724/j.gyjzG26031901

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Structural Response Analysis of Tie Rod Fracture in CFST Arch Bridges Based on Field Monitoring

doi: 10.3724/j.gyjzG26031901

1. School of Civil Engineering, Changsha University, Changsha 410022, China;
2. Tianjin Transportation Research Institute, Tianjin 300074, China

Received Date: 2026-03-19
Available Online: 2026-06-06
Publish Date: 2026-05-20

Abstract

Abstract

This study investigated the structural response of a 24-year-old， 160 m span concrete-filled steel tubular （CFST） arch bridge after the fracture of a single tie rod. By comparing monitoring data before and after the tie rod fracture， this study systematically analyzed the variation characteristics of key mechanical indicators， including arch foot displacement， suspender cable force， and the alignment of the arch ribs and the bridge deck. Furthermore， it evaluated the influence pattern of the tie rod fracture on the bridge structure. The results showed that after the fracture of a single tie rod， the arch feet underwent outward displacement， and both the arch ribs and the bridge deck experienced downward deflection， with the deformation values on the fractured side being significantly larger than those on the non-fractured side. The suspender cable force showed no obvious change. The deformations of the arch ribs and the deck exhibited an asymmetric distribution： the vertical deflection of the free-end half-span on the fractured side was larger than that of the fixed-end half-span， while the opposite was true for the non-fractured side. Furthermore， a full-bridge finite element model was established to simulate the structural response of the bridge induced by the tie rod fracture， and the calculated results reproduced the monitoring data of the actual bridge well. Based on this model， a dynamic amplification factor was introduced to evaluate the stress state of the remaining tie rods and the arch ribs upon the sudden fracture of multiple tie rods.
- CFST arch bridge,
- tie rod fracture,
- field monitoring,
- structural response,
- numerical simulation

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References(24)

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