Fundamental frequency variation analysis of cable-stayed bridges with damage caused by sudden incidents
DOI:
https://doi.org/10.14311/CEJ.2026.01.0005Keywords:
Cable-stayed bridges, Cable-stayed cables, Sudden incidents, Fire, Fundamental frequency variationAbstract
Cable-stayed bridges have become one of the fastest growing and most competitive bridge types in modern bridge engineering due to their large spanning capacity and novel structure. Rapid economic development has led to a gradual increase in the number of vehicles transporting flammable and explosive products, as well as an increase in the incidence of bridge fires. Cable-stayed cables are usually close to the carriageway, and a fire will inevitably cause varying degrees of harm to the cable-stayed cables of a bridge in the event of a fire, leading to significant economic losses. Dynamic performance of cable-stayed bridges after fire is investigated by different simulation analyses of fire-induced damage to the tension cables. Results show that different tie damage has different effects on the dynamic characteristics of the whole bridge, and the tie damage has the greatest effect on the vertical symmetric bending formation, and almost no effect on the longitudinal drift, transverse bending and torsion formations. Different levels of damage to the tension cables affect the dynamic performance of the bridge in terms of quantitative changes, with the frequency of a certain order formation increasing as the level of damage increases. It is particularly important to quickly and accurately analyze and evaluate the mechanics of overfire cable-stayed bridges to provide an accurate basis for decision-making.
Received: 07.12.2024
Received in revised form: 10.09.2025
Accepted: 27.03.2026
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