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Title |
Effect of Impact Vehicle and Support Truck Weight on Occupant Risk Index and Roll-Ahead Distance of Truck Mounted Attenuators
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Authors |
문병갑(Byung-Kab Moon) ; 김경주(Kyoung-Ju Kim) ; 조두용(Doo-Yong Cho) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.6.92 |
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Keywords |
TMA; 실물충돌시험; 전방이동거리; THIV; PHD TMA; Full-Scale Crash Test; Roll-Ahead Distance; THIV; PHD |
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Abstract |
Truck Mounted Attenuators (TMAs) are employed on highways during maintenance or emergency repair operations, as well as for the inspection and management of bridge structures, in order to simultaneously protect road workers and vehicle occupants in the event of a collision.
In the United States and Europe, the performance of TMAs is evaluated through full-scale crash tests; however, domestic standards remain limited compared to international criteria, particularly in terms of the weight ranges of support truck and test vehicles. This study analyzed occupant safety indices?namely the Theoretical Head Impact Velocity (THIV), Post-Impact Head Deceleration (PHD), and Acceleration Severity Index (ASI)?along with roll-ahead distance, based on crash tests conducted with combinations of test vehicle weights (1.3 ton and 2.0 ton) and support truck weights (5 ton and 10 ton). The results showed that an increase in test vehicle weight led to a decrease in THIV, while PHD exceeded the threshold criteria.
Furthermore, a reduction in support truck weight caused the roll-ahead distance to increase by up to eleven times, thereby heightening the risk of secondary accidents for workers positioned ahead of the support truck. These findings are expected to serve as fundamental data for the improvement of future TMA performance evaluation standards.
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