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원심모형 실험을 이용한 건조토 지반에서의 군말뚝 효과 분석
유민택,차세환,최정인,한진태,김명모 한국지반공학회 2012 한국지반공학회논문집 Vol.28 No.1
In this study, a series of centrifuge shaking-table tests for a 3 × 3 group pile and a single pile applied by sinusoidal wave was performed in dry sand for various pile spacings, ranging from three to seven times the pile diameter. A comparison of centrifuge tests of both single pile and group pile showed that the lateral ground response of the group pile was smaller than that of the single pile. In addition, the reduction in subgrade reaction for the group pile increased with decreasing pile spacing. The side piles, that is, the 1st row and 3rd row piles showed identical dynamic p–y behavior and the center pile in the 2nd row caused a lower reduction effect compared with the 1st and 3rd row piles. From the comparison between the p-y curves of the 2nd row piles, it was found that the lateral ground response of the outer pile in the 2nd row was less than that of the center pile in the 2nd row. The p-multipliers for the side piles, for the center pile and for the outer pile ranged from 0.28 to 0.77, from 0.55 to 1.0 and from 0.39 to 0.87, respectively.
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소진섭(Jin-Sub So),정연일(Yeon Il Jeong),박근배(Geun-Bae Park),차세환(Se-Hwan Cha),금종호(Jong-Ho Keum) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
KTX 공기제동장치는 대차 당 제동패널을 구성하여 각 대차에 효율적으로 분담하고 있다. 또한 객차대차 제동패널, 동력대차 제동패널, 기관사 제동패널, 공압보조패널, 기타 부속품으로 분류할 수 있다. 제작사와 운영기관에서 보유하고 있는 시험기로 최종 성능을 확인하였다. 객차대차 제동패널을 포함하여 4종의 패널에 대해서는 내구성 시험을 현재 계속 시행하고 있으며, 모두 만족한 수준으로 나타났다. Air brake system of KTX effectively distributes air to brake in each bogie, System consists of carrying bogie brake panel, motor bogie panel, driver’s valve panel, pneumatic auxiliary panel and other accessories. We have verified the performance by the tester with the presence of certification authority. We have conducted the static and dynamic tests of the prototype. Durability tests for 4 items including carrying bogie brake panel have been conducted. Tests satisfy all of condition until now.
ScienceON
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