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황낙연(Hwang nak-Yeon),김창환(Kim chang-huwan) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
국내 고속철도 강합성 교량이 경부고속철도 8-2공구에서 처음으로 시고완료 되었다. 그동안 수년간에 걸쳐 고속철도 교량시공에도 불구하고 강합성 교량이 적용되지 못했던 것은 설계기술적인 면과 더불어 재료적인 면에서 국내여건이 성숙되지 못한 요인이 크다고 보여진다. 본 고에서는 기 설계된 PC BOX교량중 지형여건상 강합성교량이 적합한 교량구간을 제시하였다. 또한 강합성 교량의 설계기술적인 면중 특히 중요한 한국형 TGV차량의 동적하중의 적용과 그에 따른 구조물 거동의 평가를 1@50 교량에 대한 8-2공구 사례를 통하여 논의하였다. 강합성 단면은 단순 2주형 주형거더(double I beam)이며 플랜지 두께는 최대 80-100mm가 적용되어졌다. 본 단면에 대한 HL차량하중등에 대한 정적해석을 통하여 관심이 되고 있는 플랜지등의 응력 검토결과를 보여주었다. 아울러 정적해석과 동적해석의 결과치를 비교하여 국내 시방서에서 제시된 고속철도 HL차량하중에 대한 평가도 이루어졌다.
김경남,정인수,황낙연,정경섭,Kim, Kyoung Nam,Jung, In Su,Hwang, Nak Yeon,Jung, Kyoung Sup 한국강구조학회 2004 韓國鋼構造學會 論文集 Vol.16 No.6
피로설계에 대한 기준, 시방서 또는 추천안 등은 일반적으로 두께 10~30mm의 강판으로 만든 실험체의 피로실험을 통해 얻은 피로강도곡선을 근거하고 있다. 그러나 강판의 두께가 증가함에 따라서 피로강도가 감소하게 될 가능성에 대해 관심을 갖게 되었고, 파괴역학적 방법에 의한 분석과 강재 용접에 따른 영향을 근거로 하여 강판의 두께에 따른 영향이 상당히 클 수도 있다고 지적되었다. 기존의 몇몇 피로실험 결과로부터 얻은 피로강도곡선으로부터 강판 두께에 대한 영향을 고려하여 피로강도를 수정하는 식이 제안되어왔다. 본 연구에서는, 두께 80mm까지의 국내생산 SM520C-TMC 강재에 대한 피로강도시험을 실시하고, 그 결과로부터 강재의 두께에 따른 영향을 평가하였다. 최종적으로, 강판 두께에 대한 영향을 고려하여 피로강도를 수정하는 제한적인 시편에 대한 수정식을 제공하고, 이를 기존의 연구결과와 비교 검토하였다. 결과로서, 두께에 따른 강도감소효과는 기존의 연구와 유사한 경향을 갖고 감소하나 그 정도는 적어지고 있는 결과를 얻을 수 있었다. The criterion or specification on fatigue design has been generally based on fatigue strength curve derived by tests on specimens with varying thickness (10-30mm). Making the plate thicker, however, also decreases fatigue strength. It has been noted from the test results and the results of the analysis by fracture mechanics that the effect of thickness cannot be bypassed. From the several fatigue strength curves of specimen tests, modification of fatigue strength on plate thickness has been proposed. In this study, fatigue tests on SM520C-TMC were carried out, and the effects of thickness were evaluated. Finally, in consideration of the thickness, the modification of fatigue strength was derived. Comparing the results of this paper with those of previous studies, an outline of the behavior obtained is similar to previous ones, but the rate of decrease is smaller.
김용일(Yong-Il Kim),황낙연(Nak-Yeon Hwang),윤영훈(Young-Hoon Yoon),지홍근(Hong-Keun Jie),장성욱(Sung-Wook Jang),김동현(Dong-Hyun Kim) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
As use of tunnels and subways increase there also are accidents proportionate to it. Daegu Subway Station fire, Hongjimoon tunnel fire led people to be conscious of disaster protection and as a result, there is a trend to adopt standards for fire protection. Accordingly, this thesis is focused on investigating various fire and water protection related issues for subaqueous tunnel under Han river. The thesis developed evacuation and disaster prevention plan as fire level increases and have identified the suitability of disaster prevention through evacuation and fire simulation, countermeasure of a water leakage during construction and operation considering the subaqueous tunnel. And we selected EPB shield TBM equipment considering the ground condition and effect of boring hole, and accomplished reasonable water protection design through setting goals using event-tree method, as well as examining model test of boring hole and flooding in heavy rain. Also included structured total system consist of water leakage sensing system, water protection gate, pumping system and fire protection system to respond systematically in emergency.
대전 동서관통도로 Front-Jacking공법 시공사례
김용일(Kim Yong-Il),황낙연(Hwang Nak-Yeon),차종휘(Cha Jong-Whi),장성욱(Jang Sung-Wook),이내용(Lee Nai-Yong) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
The crossing construction under railroad have two methods which are cut and cover and trenchless method. First, cut and cover method is an extremely limited method concerning non-running time. Whereas, trenchless method is free from restriction such as train speed and running time, and has the strong points of safe and rapid construction. Front Jacking method, one of the trenchless methods, is frequently applied recently due to its stability during construction and vantage of assuring schedule reliability. The procedure is that after minimizing interlocking friction with structure and earth pressure due to jacking the small steel tube, pulling the precast box manufactured at the field in the ground using PC strand and hydraulic Jack. This method is able to be applied regardless of section size and length of box and condition of soil. And that is also pro-environmental. This paper presents the case of Daejeon E. W. perforate Road Project applied with the Front Jacking method.
김용일(Yong-Il Kim),김동현(Dong-Hyun Kim),황낙연(Nak-Yeon Hwang),장성욱(Sung-Wook Jang),김장수(Jang-Su Kim),형태경(Tae-Kyung Hyung) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper a determination of the optimal segment sealing material for a tunnel under the Han river between the Sungsoo-dong, Sungdong-Gu and the Chungdaw-dong, Kangnam-Gu in the Bundang railway. The geological investigation results show that some fractured zones exist locally under the northern boundary of the Han river bed, but the other regions consist mostly of hard rocks of good quality in the tunnel excavation level. Also, a hign water pressure of 5㎏f/㎠ and a flash inflow of river water due to old boring holes are expected during tunnel excavation. A combined type sealing material of EPDM gasket with expansional rubber is selected as a optimal segment sealing material for the Han river tunnel considering the geological and site conditions.
김용일(Yong-Il Kim),임종윤(Jong-Yoon Lim),정두석(Doo-Suk Jung),이상한(Sang-Han Lee),황낙연(Nak-Yeon Hwang),박광준(Kwang-Joon Park) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper a design of a large shield Tunnel through weathered soil and weathered rock in 703 section of seoul subway line No.7 extension project is presented. The geological investigation results show that the project region consists mostly of weathered soil with some local weathered rock in the tunnel excavation level. A EPB shield TBM is selected as a optimal excavation machine for the large shield Tunnel considering the geological and site conditions. Also, the shield machine head and cutter for the large shield tunnel type are designed considering site geological conditions and average advance rate in similar projects.