지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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PURPOSES : The impact performance of flexible barrier system such as structural response, vehicular motion and occupant safety vary depending on the impact point. Thus, to properly evaluate the performance of a flexible barrier system, impact should be made to a point which will lead to the worst possible results. This point is called the Critical Impact Point (CIP). This paper presents the way to determine the CIP for a SB2 class flexible barrier system which is consisted of Thrie-Beam rail and circular hollow tube post of 2m span. METHODS: Barrier VII simulations were made for impact points; Case 1 at a post, Case 2 at 1/3 span downstream from a post, Case 3 at middle of the span, Case 4 at 2/3 span downstream from a post. For the structural performance (deflections), impact simulation of 8000kg-65km/h-15degree was used, and for vehicle motion and occupant safety, simulation of 1300kg-80km/h-20degree impact was made and analysed. RESULTS: Case 1 gave the largest dynamic deflection of 75.72cm and also gave the largest snag value of 44.3cm. Occupant safety and exit angle of the vehicle after the impact were not sensitive to the impact point and were all below the allowable limit. CONCLUSIONS : For the SB2 class flexible barrier system's CIP can be regarded as a post which is sufficiently away from the end of Length of Need in order to avoid the end-effect of the barrier system. It can be more economic in the long run because the normal concrete pavement material is likely to cost more due to higher probability of maintenance and repair and higher social cost due to traffic accident, etc.
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참고문헌 (8)
참고문헌 신청
Bronstard, M. E. / 1974 / Recommended procedures for vehicle crash testing of highway appurtenances
Bronstard, M. E / 1988 / Guardrail-bridge rail transition designs, Vol. 1
Powell, G. H. / 1973 / BARRIER Ⅶ : A Computer Program for Evaluation of Automobile Barrier System / U.C. Berkely
John D. Reid. / 2007 / Critical Impact Point for Longitudinal Barrier, In LSTC, 2007. LS-DYNA Keyword User’s Manual / Livermore Software Technology Corporation
Michie, J. D. / 1981 / Recommended procedures for the safety performance evaluation of highway appurtenances
Bronstard, M. E / 1988 / Guardrail-bridge rail transition designs, Vol. 1
Powell, G. H. / 1973 / BARRIER Ⅶ : A Computer Program for Evaluation of Automobile Barrier System / U.C. Berkely
John D. Reid. / 2007 / Critical Impact Point for Longitudinal Barrier, In LSTC, 2007. LS-DYNA Keyword User’s Manual / Livermore Software Technology Corporation
Michie, J. D. / 1981 / Recommended procedures for the safety performance evaluation of highway appurtenances
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