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노반의 강성 변화가 궤도수직강성에 미치는 영향 및 경제성 분석
권순섭(Kwon Soon-Sup),김대상(Kim Dae-Sang),박성용(Park Seong-Yong),박태순(Park Tae-Soon) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Vertical stiffness of track of high speed railway with ballasted track provides two contrasting characteristics. With high vertical stiffness, deterioration of the geometry of the track is accelerated. So the cost of maintaining the geometric quality of a track increases. Though dynamic loads decrease with excessively flexible track, however, more energy is dissipated by the vehicle, which leads to higher operating costs. Therefore, there is an optimum vertical stiffness of the track that provides a compromise between the contrasting effects. In this study, numerical analysis was performed to analyze the effect of stiffness variation of subgrade on vertical stiffness of track, and to derive the optimum stiffness of subgrade. 3 types of subgrades(soil, crushed aggregate, concrete) were used, and the stiffness of subgrade were divided to upper, upper-intermediate, intermediate, lower-intermediate, and lower stiffness levels. From the results, optimal vertical stiffness of the track (63.0~77.2 MN/m) was obtained in soil and crushed aggregated subgrade with the stiffness higher than upper-intermediate stiffness. However, it was found that all subgrades with concrete type showed uneconomical range of vertical stiffness(more than 106 MN/m), so it was concluded that railpads with lower stiffness to decrease a vertical stiffness of track should be installed.
장 경간 철도교량(L=40M)의 Precom Beam 적용사례 연구
권순섭(Kwon Soon Sup),정인철(Jeong In Choul),김용표(Kim Yong Pyo),신동기(Shin Dong Kee),신상철(Shin Sang Chul) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The 4th Bridge of Do-Kok which will be made in the third section part of work, called Chung-Ang Railroad Line(Deok-So~Won-ju) is planed that the roadbed newly established is higher than the existing roadbed. So people in Pal-Dang Li demand downward settlement of the roadbed newly established because of a prospect of The Han-River. Because of the claim, there were two conferences to analyze the field condition, terms of works and economical efficiency regarding design modification(downward settlement of design elevation(70cm), the minimum span length(40m) and height from the bottom of the slab to ground(5m). Through such conferences, it is possible to apply The Precom Beam to The 4th Bridge of Do-Kok in our construction field after investigating structural safety.
조선규(Cho Sun Kyu),권순섭(Kwon Soon Sup),김선곤(Kim Sun Kon),이종신(Lee Jong Shin),이종민(Lee Jong Min) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Along with the steady development of Korean Railway construction technology, Contemporary society needs more modernized structures which can meet not only structural value but also aesthetic and environmental value. To follow this demand of society, Pre-Stressed Concrete U-girder bridge(Somg-Lim Gyo, L=330m) is introduced in "JINJOO-KWANGYANG RAILWAY CONSTRUCTION PROJECT". On the environmental point of view, the huge noise due to the operation of train can be reduced remarkably by the side beam of U-girder which is high enough to substitute soundproofing wall. Moreover, by aesthetic variation of the shape of outer beams and coping of piers, the exterior view of the bridge can be improved and in accordance with surroundings. Pre-Stressed Concrete U-Girders which are built up above the outer sides of slab deck make easier to secure the clearance of a bridge and make it possible to lower the distance of centroid between superstructure and railroad tracks.