• 한국안전학회지
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• 제31권2호
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• pp.83-89
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• 2016

As the world's industrial development quickens, the highways and regional expressways have been expanding to serve the logistics and transportation needs of people. The burgeoning road construction has led to a growing interest in roadside installations. These must have reliable performance over long periods, reduced maintenance and high durability. Steel roadside barriers are prone to corrosion and other compromises to their functionality. Therefore, using high anti-corrosion steel material is now seen as a viable solution to this problem. Thus, the objective of this paper is to expand the scope of applications for high anti-corrosion steel material for roadside barriers. This paper assesses the impact safety such as structural performance, occupant protection performance and post-impact vehicular response performance by a simulation review on roadside barriers built with high strength anti-corrosion steel materials named as hot-dip zinc-aluminium-magnesium alloy-coated steel. The simulation test results for the roadside barriers built with high strength anti-corrosion steels with reduced sectional thickness meet the safety evaluation criteria, hence the proposed roadside barrier made by high strength and high anti-corrosion hot-dip zinc-aluminium-magnesium alloy-coated steel will be a good solution to serve safe impact performance as well as save maintenance cost.

• 한국도로학회논문집
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• 제14권4호
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• pp.113-124
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• 2012

PURPOSES : In This study two different concrete barrier systems have been proposed to be established at the small vehicle driveway. One is for median barrier, and the other is for roadside barrier. METHODS : In order to determine the suitable shape of barrier, the impact parameters including vehicle weight, impact angle, impact velocity and impact level have been analyzed. The real crash test has been carried out with 0.9 ton and 2.5 ton vehicles, respectively by using the 2m segment type concrete barriers connected by steel plates that are totally 40m barrier systems. RESULTS : The numerical results obtained by LS/DYNA-3D software are compared with real crash tests from the viewpoints of vehicle stability, vehicle trajectory, occupant risk, etc. CONCLUSIONS : From the above results, the dynamic performance of proposed barrier systems satisfies the specification of Korean Code for roadside safety structures.

• 복합신소재구조학회 논문집
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• 제4권2호
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• pp.25-30
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• 2013

In this study a hybrid safety barrier system consisting of steel rail and carbon fiber reinforced polymer (CFRP) post is considered. W hile CFRP post is selected for impact energy reflection due to its high strength, steel rail is selected for impact energy absorption due to its high ductility. A numerical model considering the elastoplastic behavior of steel is formulated to simulate the dynamic responses of the hybrid system subject to an impact load. A hybrid roadside guard rail system of steel rail and CFRP post is proposed and analyzed with a case study. The numerical model for the hybrid roadside guard rail system is used to find optimized design of the proposed hybrid system.

• 자동차안전학회지
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• 제6권2호
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• pp.55-60
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• 2014

To verify the performance of roadside safety facilities, strength and occupant protection test are performed by evaluation criteria. Strength test use a truck and occupant protection test use a sedan. Strength perfomance is analyzed pass rate by post lateral resistance of the safety barrier. Occupant protection performance is analyzed from THIV(Theoretical Head Impact Velocity) and PHD(Post-impact Head Deceleration) by crash cushion test.

• 한국산학기술학회논문지
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• 제13권11호
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• pp.5558-5565
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• 2012

도로 방호울타리는 차량의 이탈을 방지하는 시설로, 도로의 형태나 제한속도 등을 기준으로 하여 7 종류의 방호울타리를 규정하고 있다. 하지만, 최근 차량의 성능이 향상되면서 과적, 과속의 위험이 있고, 국내외 방호울타리 관련 차량사고를 보면 추락사고가 빈번하게 발생하고 있어, 현재의 방호울타리 설계충격도가 다소 부족한 것으로 나타나고 있다. 본 연구에서는 고속도로에 주로 적용하는 SB5 강재 방호울타리와 SB6 콘크리트 방호울타리의 차량방호 성능을 검증하기 위하여 차량충돌해석을 수행하여, 방호울타리의 파괴 및 차량전도 조건을 산출하였다.

• 한국도로학회논문집
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• 제19권6호
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• pp.13-21
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• 2017

PURPOSES : In this research, an SB3-level roadside barrier for a highway transition zone that meets the newly established guide Installation and Management Guide for Roadside Safety Appurtenance is developed. Its performance is evaluated by a numerical simulation and real-scale vehicle impact test. METHODS : The commercial explicit dynamic software LS-DYNA is utilized for impact simulation. An FE model of a passenger vehicle developed and released by the National Crash Analysis Center (NCAC) at George Washington University and a heavy goods vehicle (HGV) model developed by the TC226/CM-E Work Group are utilized for impact simulation. The original vehicle models were modified to reflect the conditions of test vehicles. The impact positions of the passenger vehicle and truck to the transition guardrail were set as 1/2 and 3/4 of the transition region, respectively, according to the guide. RESULTS : Based on the numerical simulation results of the existing transition barrier, a new structural system with improved performance was suggested. According to the result of a numerical simulation of the suggested structural system, two sets of transition barriers were manufactured and installed for real-scale vehicle impact tests. The tests were performed at a test field for roadside safety hardware of the Korea Highway Corporation Research Institute. CONCLUSIONS : The results of both the real-vehicle impact tests and numerical simulations of the developed transition barrier satisfied the performance criteria, and the results of numerical simulation showed good correlation with the test results.

• 한국산학기술학회논문지
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• 제15권4호
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• pp.2414-2418
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• 2014

본 연구에서는 교량 통합 부대시설 모듈 구조 개발을 위하여 측면 탈 부착식 교량 방호울타리의 3차원 유한요소해석 및 구조 안정성 평가를 수행하였다. LS-DYNA 프로그램을 사용하여 연결 모듈의 격벽 간격 및 볼트 갯수 변화가 방호울타리 구조의 변위 및 응력에 미치는 영향을 상세 분석하였다. 본 연구에서는 LS-DYNA 프로그램을 사용한 유한요소해석은 콘크리트 바닥판에 삽입된 앵커볼트로 연결된 모듈 위에 설치된 방호울타리의 정적 거동과 구조 안전성을 분석하기 위하여 확장되었다. 수치해석은 6개의 매개변수에 대하여 방호울타리에 발생된 처짐 및 응력분포를 비교 분석하였으며 모두 구조적으로 안전성을 확보하는 것으로 나타났다.

• Journal of the Korean Wood Science and Technology
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• 제39권5호
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• pp.390-397
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• 2011

In this study, bending test was conducted as beam members in timber roadside safety barrier. The flexural properties of pitch pine round timber according to the diameters were evaluated. And then grading based on the growth characteristics applied to choosing the pitch pine round timbers which is met the criteria of guideline (Japan, 2008). MOR of round timber 160 mm is higher than other specimens from 100 mm to 140 mm. Because of lower juvenile wood ratio and higher density. The MOE of round timber is decreased according to the increment of diameter. Only 32% of the specimens has passed the limitations. Performance of pitch pine round timbers has confirmed to suitability roadside safety beam members according to the guideline (Japan, 2008).

• 대한교통학회지
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• 제29권2호
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• pp.59-67
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• 2011

본 연구에서는 충돌사고시 스마트하이웨이의 정시성과 안전성의 손상정도를 최소화 하도록 스마트하이웨이의 종방향 베리어 충돌조건으로 기존의 충돌조건보다 상당히 상향된 충돌조건이 제시된다. 스마트하이웨이 충돌조건을 적용하여 기존 국내 최고 성능등급 베리어에 대한 컴퓨터 시뮬레이션 결과 탑승자 안전도를 만족하지 못하였다. 스마트하이웨이 충돌조건에 만족하는 베리어 개발을 위해서 컴퓨터 시뮬레이션에 의한 설계를 수행하고 실물차량 충돌시험을 통한 성능 검토결과 개발된 N등급 베리어가 탑승자 안전지수와 구조적 적절성을 만족하였다.

• 한국재난정보학회 논문집
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• 제12권3호
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• pp.279-285
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• 2016

차량방호울타리는 교통사고 발생 시 마지막 안전장치이다. 차량방호울타리의 구조적 성능이 기대 수준 이상으로 유지가 되어야지만 운전자 혹은 차량 탑승자의 생명을 보호해 줄 수 있게 된다. 단부처리시설은 방호울타리의 끝단에 설치되며 차량 충돌 시 가드레일이 차량에 관통하는 현상을 방지함과 동시에 충격을 흡수하는 형태의 시설물이다. 이러한 차량방호울타리의 개발을 위하여 컴퓨터 시뮬레이션을 통한 반복해석을 수행함으로서 다양한 변수에 적절히 대응하는 방호울타리를 개발할 수 있을 것이다.