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Title |
Proposal of a Circular Saddle Device to Maintain Tension in Guard Cable Barriers and Verification through Finite Element Analysis
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Authors |
김규섭(Kyuseup Kim) ; 김진국(Jin-Kook Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2026.30.1.133 |
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Keywords |
가드케이블; 긴장력 유지; 강연선; 방호울타리효율; 긴장력 유지장치 Guard cable barrier; Maintaining tension; Guard cable; Barrier; Tension maintaining device |
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Abstract |
This study found that guard cable barriers using steel wires experience tension loss over time due to various factors, including deformation of anchoring devices, friction with fixing devices, and steel relaxation. Tension loss in guard cables can cause external sagging due to their own weight, create visual discomfort, and even cause the guard cables to lose their protective effect against external impacts. Therefore, this study identifies various causes of tension loss in guard cable barriers and examines their respective impacts to determine the need for maintenance. Loads were planned for the guard cables and the target structures for each span and load-deflection simulations were performed on the guard cable barrier. Comparing the results of effective tension force and deflection calculations, it was confirmed that the conventional type could not meet the requirements of the Road Safety Facility Installation and Management Guidelines under load. A proposed type was developed to address the shortcomings of a conventional type, and compared them with a conventional type through simulation to confirm the performance potential based on analysis. The functionality and performance about proposed type were verified by comparing simulations with conventional type. The load-deflection simulation results for the proposed type showed that it maintained its effective tension force compared to the conventional type when the guard cable lost tension due to load. Furthermore, the proposed type meets the regulation on the provisions for guard cable deflection in the Road Safety Facility Installation and Management Guidelines.
The various findings obtained through this study are expected to be useful in estimating maintenance costs and establishing inspection schedules for existing guard cables. In addition, it is expected that future related inspection standards and facilities will be supplemented based on this study and utilized for maintenance of vehicle safety fences and rockfall prevention nets, thereby minimizing the resulting damage.
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