• Title/Summary/Keyword: 실물차량 충돌시험

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A Study on the Performance Comparison of S2 type Bridge Rails (S2급 교량용 방호울타리의 성능비교 연구 (F형 콘크리트와 철재 교량용 방호울타리를 중심으로))

  • 정봉조;주재웅;이성관;장명순
    • Journal of Korean Society of Transportation
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    • v.20 no.2
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    • pp.117-124
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    • 2002
  • 새로 개발한 철재 교량용 방호울타리는 기존 시설에 비해 충격흡수기능과 조망권 확보, 융설작업, 유지보수가 용이하도록 설계되었다. 본 연구는 새로 개발한 철재 교량용 방호울타리를 건설교통부의 $\ulcorner$도로안전시설 설치 및 관리지침 - 교량용 방호울타리 편. 1999$\lrcorner$ 의 설계기준에 따라 기존 고속도로에 사용하고 있는 F형 콘크리트 교량용 방호울타리와 성능비교를 통해 평가하고자 하였다. 비교평가는 S2급 교량용 방호울타리의 시험기준으로 실시하였으며 결과는 다음과 같이 나타났다. 첫째, 소형승용차를 대상으로 한 운전자의 안전도 평가에서는 두가지 시설 모두 강도성능, 충돌 후 차량 안전성능 구성 부재 비산 억제 성능 등 세 가지 기준을 만족하였으나, 가속도 기준에 있어서는 철재 교량용 방호울타리는 기준인 20g 이하인 18.2605g로 나타나 안전기준을 만족하였고, F형 콘크리트 교량용 방호울타리는 20.1791g로 나타나 기준을 약간 상회하는 것으로 나타났으나 안전기준의 범위에 있는 것으로 평가하였다. 둘째. 대형차량을 대상으로 한 방호울타리의 구조적 안정성 평가에 있어서는 F형과 철재 교량용 방호울타리 모두 평가기준에 적합한 것으로 나타났다. 새로 개발한 철재 교량용 방호울타리는 국내 최초로 모의충돌시험과 실물차량 충돌시험을 통해 개발하였다는 의의를 가지고 있으며 성능측면에서도 기존의 시설에 비해 충분히 안전하다는 것을 증명하였다. 그러나 측정시설의 미비로 충돌후의 차량의 이탈속도나 이탈각도에 대하여 만족할 만한 수준의 결과를 제시하지는 못하였다.

Study on Analysis of Occupant Safety Index & Behavior Using Full-Scale Crash Test Data of Crash Cushion (충격흡수시설의 실물차량 충돌시험 데이터를 이용한 탑승자 안전도 및 충돌거동 분석에 관한 연구)

  • Joo, Jae Woong;Kum, Ki Jung;Jang, Dae Young;Kim, Bum Jin
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.2D
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    • pp.163-170
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    • 2008
  • According to the rules, a crash cushion is supposed to set up products that is satisfied with the standard of a performance test after performing the car crash test by road safety facilities and management guide. For development of crash cushion, performance should be estimated through the car crash test eventually. However, there is no reasonable design method which considers passenger's safety and only depend on crash test without an alternative plan. Therefore it incurs a loss materially and takes a lot. Therefore, we are asked to create a systematic design of the crash cushion. This study shows that a scientific basis of applying single degree of freedom when it designs the crash cushion after analyzing vehicle crash test data of crash cushion and also represents design of crash cushion through single degree of freedom response spectrum using calculated by crash test data on crash cushion.

Assessment on the Possibility of Increase of SB5-B Small Car Impact Velocity (SB5-B 소형차 충돌속도의 상향 가능성 평가)

  • Kim, Kee-Dong;Ko, Man-Gi;Joo, Jae-Woong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.6
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    • pp.3013-3022
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    • 2013
  • Satisfying the large car impact condition of the high level SB5-B for "SMART Highway" longitudinal barriers, the possibility of increase of the small car impact velocity from 120km/h to 130km/h was investigated. Through computer simulation using input parameters calibrated to full-scale crash test results, various longitudinal semi-rigid barrier models were improved such that for the small car impact speed of 120km/h the change of longitudinal and transverse velocities of the impact vehicle can satisfy the THIV limit. The barrier model determined through this process satisfied the performance assessment criteria for SB5-B impact conditions. Varying the wing angle of slip block-outs of the passed barrier model, the possibility of increase of the small car impact velocity was investigated by FEA and a full-scale crash test was conducted. It has been shown that the possibility to increase the small car impact speed to 130km/h is high if the test facility condition for 130km/h impact velocity is better equipped.

Crashworthiness Evaluation of Bridge Barriers Built with Hot-dip Zinc-aluminium-magnesium Alloy-coated Steel (고내식성 용융합금도금강판 적용 교량난간의 충돌성능 평가)

  • Noh, Myung-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.3
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    • pp.171-176
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    • 2016
  • This paper proposes road safety facilities applying Hot-dip zinc-aluminum-magnesium alloy-coated steel sheets and coils to reduce the loss of function caused by the corrosion of steel in the service state. Vehicle crash simulations and full-scale crash tests were carried out to provide reliable information on evaluating the crash performance with the products of road safety facilities built with hot-dip zinc-aluminum-magnesium alloy-coated steel. From the results of the simulations and full-scale crash tests, the impact behaviors evaluated by the three-dimensional crash simulations considering the strain-rate dependency in a constitutive model were similar to those obtained from the full-scale crash test results. The full-scale crash test results met the crashworthiness evaluation criteria; hence, the proposed bridge barrier in this paper is ready for field applications.

Analysis between Computer Simulation and Real-car Crash Test of Energy Absorption Facilities for Various Road Environments (다양한 환경에 적용 가능한 충격흡수시설의 시뮬레이션 분석 및 실물충돌시험 결과 분석)

  • No, Min Hyung;Park, Jea Hong;Seo, Chang Won;Sung, Jung Gon;Yun, Duk Geun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.42 no.3
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    • pp.399-407
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    • 2022
  • Energy absorption facilities installed on roads should follow the performance standards of the real-car crash test of 'Installation and Maintenance Guidelines for Roadside Safety Facilities'. However, due to different installation conditions, such as differing structure widths on roads, some energy absorption facilities do not provide adequate performance. In order to apply varied environments on roads, an energy absorption structure was designed in this study with 150 mm height and four layers of W-shape guardrail at 200 mm intervals, and the performance was verified using LS-DYNA computer simulation. Through a real-car crash test, the performance of the facility designed by LS-DYNA was tested and was found to meet the performance of the CC2 category for crash cushions. The conclusion of the comparison demonstrates that the simulation and the real-car crash tests are both significant.

A Comparison of Concrete Median Barriers in terms of Safety Performance using Computer Simulation (컴퓨터 모의층돌시험을 통한 콘크리트 중앙분리대 방호울타리 형식별 성능비교 연구)

  • 정봉조;장명순
    • Journal of Korean Society of Transportation
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    • v.21 no.1
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    • pp.115-125
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    • 2003
  • The concrete median barriers are the most popular safety appurtenance that can be installed on narrow medians and are effective in keeping uncontrolled vehicles from crossing into opposing lanes of traffic. It is necessary to install and maintain median barriers because it is very difficult to reserve enough room required for medians in KOREA. Also, concrete median barriers are accepted as the actual alternatives for median barriers, mostly because they require almost no maintenance even after serious collisions. Typical concrete median barriers are 810mm high and have 596mm high glare screens on top of them. However we have experienced a number of "climb" and "roll-over" accidents of heavy vehicles and most of all, there have been some serious accidents caused by the part of broken glare screens. So the improvement study of concrete median barriers started. Prior to this study, a new type of concrete median barrier was suggested which is 1,270mm high and has no glare screens on top of it. So it was required to compare the properties of various types of concrete median barriers including the new type to find the optimal type of concrete median barrier. In this study, we have evaluated the characteristics of four types of concrete median barriers (New Jersey type, F type, constant slope type, and wall type). We have performed many computer simulations for the evaluation of the crashworthiness of them, and through the simulations we have tried to find a proper type of concrete median barrier. Through the computer simulations, we evaluated the structural stability and safety of the four types of concrete median barriers. We confirmed the structural stability and safety of them But in regard to the probability of "roll-over" of heavy vehicles, the higher concrete median barriers showed better performances than the lower. As the result of this study a new type of concrete median barrier was recommended.

Study on Improvement Method and Performance Analysis About Occupied Existing Roadside Barriers in Expressway (고속도로에서 공용중인 노측용 차량방호울타리의 성능분석 및 개선방안에 관한 연구)

  • Joo, Jae-Woong;Jang, Dae-Young;Ha, Jong-Moon;Park, Je-Jin
    • International Journal of Highway Engineering
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    • v.13 no.4
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    • pp.9-17
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    • 2011
  • It is possible to set up the Roadside Barrier which is suitable for Performance Evaluation Criteria by domestic standard. But a number of section of expressway roadside have old guardrail that was installed before reform the guideline. These poor performance guardrails threaten driver's life. There is lots of difficult problem to change old guardrails that are installed 2,777km in expressway of whole road side at the same time. Especially budget problem. The purpose of study is to develop performance improvement guardrails by the minimum reinforcement. In this study, guardrail improvement method(SB1, 3, 5 grade) is developed through crash simulation using LS-DYNA 3D and vehicle crash test. And it's expected not only to decrease of collision accident but to increase safe level. Of course one thing that can't be missing is to reduce a lot of budget of guardrail change.

Study on Behavior Analysis of Crash Cushion Using Analysis Data of High-Speed Camera (고속카메라 영상분석 데이타를 이용한 충격흡수시설의 충돌거동 분석에 관한 연구)

  • Jang, Dae-Young;Ko, Man-Gi;Lee, Yoon-Ki;Joo, Jae-Woong
    • International Journal of Highway Engineering
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    • v.11 no.2
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    • pp.75-83
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    • 2009
  • Collision behavior of clash cushion occurs for a second of less than 0.4sec usually so that it is too hard to calculate numerically. Therefore, for development of trash cushion, it rely on full-scale vehicle crash test without any design procedure. Occupant safety indices if calculated from acquired data by data measurement system and collision behavior of vehicle and crash cushion is filming using high-speed camera in the crash test. But practical ufo scope of high-speed camera is limited and it is not using to calculated the occupant safety indices or analyzed the energy dissipated mechanism of crash cushion. This work is to estimate to be suitable or not for compare the data from measurement system with the data from high-speed camera. And also it is to grope for practical use scheme to calculation of occupant safety indices or analysis of collision behavior.

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A Study on Dynamic Behavior of Guardrail Associated with Design Variables (설계변수에 의한 가아드레일의 동력학적 거동에 관한 연구)

  • Woo, K. S.;Ko, M. G.;Cho, S. H.;Kim, W.
    • Computational Structural Engineering
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    • v.7 no.2
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    • pp.89-99
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    • 1994
  • The nonlinear dynamic behaviors of guardrail established on the local or high way have been investigated using BARRIER VII program with respect to four design variables such as section type of beams and posts, impact angle, impact velocity and vehicle weight. Computer simulation programs are sophisticated analytical models for analyzing dynamic vehicle/barrier interactions and provide a relatively inexpensive alternative to full scale crash testing. This study has been focused on the structural adequacy, occupant risk, and vehicle trajectory. For this purpose, the maximum defection and impact force have been calculated to design the clear zone and to analyze effect of impact attenuation. Also, the acceleration of vehicle and exit angle after collision have been computed to estimate the occupant risk. From this study, it is suggested that we should strengthen the design criteria of guardrail to prevent from disastrous traffic accidents.

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