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Calculation Method and Influence Factor for Speed Change of a Vehicle Impacting Small Sign Post  

Ko, Man-Gi (공주대학교 방재연구센터.건설환경공학부)
Kim, Kee-Dong (공주대학교 방재연구센터.건설환경공학부)
Jun, Sung-Min (경동기술공사 구조부)
Sung, Jung-Gon (한국건설기술연구원 도로연구부)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.8, no.4, 2008 , pp. 47-52 More about this Journal
Abstract
Important factor in designing a breakaway sign support is the velocity change of the impact vehicle. It is measured from the crash test or can be calculated by 3-D Finite Element Analysis. It can also be calculated with relative ease utilizing energy and momentum conservation. In this paper a formula to calculate the velocity change of a car during the time of impact against a small sign is derived utilizing the energy and momentum balance. Using the formula, parametric studies were conducted to find that impact speed, separation force and Breakaway Fracture Energy(BFE) of the posts which represent the degree of fixedness to the foundation are the important factor to vehicle's speed change. It is shown that speed change is larger in the lower speed impact and to the posts with large separation force and BFE.
Keywords
Breakaway Sign Support; Momentum; Separation Force; Breakaway Fracture Energy;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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