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네트형 토석류 방호시설에 작용하는 충격에너지에 따른 앵커부인장력 산정
김성태(Kim Sungtae),유한규(Yoo Hankyu) 한국방재학회 2018 한국방재학회논문집 Vol.18 No.2
네트형 토석류 방호시설의 안정성을 확보하기 위해서는 네트부의 설계뿐 아니라 전 시스템을 지지하는 앵커부의 설계도 중요하다. 그러나 설계된 네트의 형태와 에너지 흡수율에 따라 앵커에 작용하는 인장력이 달라지기 때문에 설계하기 어려울뿐만 아니라 국내에서는 앵커설계에 대한 지침이 제시되어 있지 않다. 이에 본 연구에서는 정재하 실험을 통해 개발된 브레이크 프레임에 대한 에너지흡수율을 평가하고, 실대형 실험을 통해 방호시설의 변형과 충격에너지에 따른 앵커부 인장력을 분석하였다. 일반적으로 충격에너지가 증가함에 따라 방호시스템의 최대 변위가 증가하고, 브레이크 프레임의 에너지 흡수율도 증가하는 경향을 나타내었다. 또한 앵커부에 작용하는 인장력도 증가하였다. 본 연구에서는 앵커설계 시 사용할 수 있는 충격에너지-인장력 간의 경험식을 실대형 실험결과를 바탕으로 제안하였다. 이는 향후 앵커설계 시 유용한 자료로 활용될 것으로 판단된다. In order to ensure the stability of net protection system for debris flow, not only the design of net but also the design of anchor which is supporting whole system is of equal importance. However, as the tensile forces acting in the anchor vary according to the net types and the energy absorption, it is not easy to design the anchor capacity for this protection system. The guidelines for anchor design are also not established yet in Korea. In this study, a specific brake frame was developed for this system and the energy absorption by the brake frame was estimated based on static load test. Based on full scale impact tests, the deformation of net protection system and tensile forces in the anchors were analysed according to impact energy level. Generally, as the impact energy increases, not only the maximum displacement of the protection system and the energy absorption by the brake frame increase, but the tensile forces acting in the anchor also increase. Based on the experimental results, an empirical relationship between the impact energy and tensile force was established which can be used in anchor design. The results obtained from this study are planned to be utilized for design of anchor in the future.
하상귀,Turab H. Jafri,홍상현,김성태,윤지석,유한규 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.1
New energy absorption devices have been developed for use in net-type debris flow protection systems. The capacity of the anchors in the system needs careful analysis because the anchors play a significant role in transmitting energy from the impacting debris to the ground. In this paper, an effective method is proposed for estimating the anchor capacity based on increasing energy levels and the effect of brake frames in the system. For this purpose, four test cases based on varying impact energy levels were developed and full-scale impact tests were performed. The maximum deformations and tensile forces developed in the system were recorded and analyzed. Thereafter, the performance of the net protection system in the presence and absence of brake frames was numerically analyzed using ABAQUS software, and the stress distribution in various system components was investigated. Based on the results of the full-scale impact tests and numerical analysis, a relationship between the total anchor capacity and impact energy level was established by considering the workability of the U-clips. This study demonstrates that approximately 40% reduced anchor capacity can be safely used for impact energy levels ranging from 50 to 200 kJ when brake frames are used in the system.
BAJA SAE 오프로드용 차량 제작을 위한 최적설계 연구
정인호(Inho Jeong),김현식(Hyun sik Kim),이효걸(Hyogeol Lee),정대근(Daegeun Jung),김동영(Dingyeoung Kim),전진호(Jinho Jeon),박도문(Domoon Park),김민석(Minseok Kim),임석연(Seokyeon Im) 한국자동차공학회 2015 한국자동차공학회 지부 학술대회 논문집 Vol.2015 No.11
Automotive engineering students of Tongmyong University make the vehicle for participating ‘2015 BAJA SAE KOREA at Yeungnam University’. The most important part of our frame design are frame stability and light weight. The proven impact-beam was used to increase the stability of the vehicle structure and to reduce the body light weight. Body frame Made of impact beams can prove stability through the stress-strength analysis. Our SEC-Y we design of vehicles, which was aiming and best-quality vehicles last year, vehicle production also attempted to do. Therefore, Our off-load vehicle ‘TU - Success’ is well coincident with the purpose of ‘2015 BAJA SAE KOREA at Yeungnam University’.