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RISS 인기검색어
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- 저자 : 주봉규(Joo Bong-Gyu) (검색결과 4 건)
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급곡선 탄성레일체결장치의 거동특성에 미치는 매개변수 연구
백찬호(Chan-Ho Baik),주봉규(Bong-Gyu Joo),최정열(Jung-Youl Choi),최일윤(Il-Yoon Choi),박용걸(Yong-Gul Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In this study the deformations and stresses occurred in the elastic rail fastening system were evaluated according to applied extreme track forces based on various field conditions track curvature and poor properties. The purpose of this study is to establish a method for efficient management and suggest guide line for track construction in order to secure the performance quality of the elastic rail fastening system on the sharp curved track.. Therefore initial construction qualities of rail and concrete bed initial clamping force and applied extreme track forces were used into experiment as several parameters. Using these test results the performance characteristics of the elastic rail fastening system were also evaluated. As a result it suggested the method to secure long-term durability of fastening system and comparing sharp curved track to results on field test.
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신길철(Shin Gil-Cheol),주봉규(Joo Bong-Gyu),정성현(Chung Sung-Hyun) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Subway routes 1~4 were constructed in gravel roadbed track structure in consideration of the technological capabilities, construction cost and duration at the time of the initial construction. As such, 224.8㎞, approximately 81.2% of entire length, of total length of railway track at 276.9㎞ was constructed on gravel roadbed. However, improvement of gravel roadbed to concreted roadbed began in 1998 due to problems including frequent repair works and limited time application for such works caused by occurrence of tract distortion during operation as well as lowering of roadbed functions and generation of dust caused by frictional power, impact absorption capabilities, abrasion and crushing of gravel on roadbed. Currently, this improvement is continuing with target of converting entire route into concreted roadbed structure. Therefore, this Study modifies formula for setting cant, analyze the correlation between wearing of rail side of the curvature and cant insufficiency following increasing of the running speed of the train, and to present the directions for fundamental review for adjustment of cant insufficiencies at the time of improvement of gravel roadbed to concreted roadbed that is being implemented on the operational tracks of the railway trains.
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신길철(Shin Gil-Cheol),양회성(Yang Hoe-Seong),주봉규(Joo Bong-Gyu),정성현(Chung Sung-Hyun) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Subway routes 1~4 were constructed in gravel roadbed track structure in consideration of the technological capabilities, construction cost and duration at the time of the initial construction. As such, 224.8㎞, approximately 81.2% of entire length, of total length of railway track at 276.9㎞ was constructed on gravel roadbed. However, improvement of gravel roadbed to concreted roadbed began in 1998 due to problems including frequent repair works and limited time application for such works caused by occurrence of tract distortion during operation as well as lowering of roadbed functions and generation of dust caused by frictional power, impact absorption capabilities, abrasion and crushing of gravel on roadbed. Currently, this improvement is continuing with target of converting entire route into concreted roadbed structure. Therefore, this Study modifies formula for setting cant, analyze the correlation between wearing of rail side of the curvature and cant insufficiency following increasing of the running speed of the train, and to present the directions for fundamental review for adjustment of cant insufficiencies at the time of improvement of gravel roadbed to concreted roadbed that is being implemented on the operational tracks of the railway trains.
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성덕룡(Deok-Yong Sung),공선용(Sun-Young Kong),주봉규(Bong-Gyu Joo),이연근(Yeon-Geun Lee),이창헌(Chang-Hun Lee) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.10
최근 연구결과 레일연마 및 장대레일화를 통해 누적통과톤수에 의한 레일교체기준의 연장이 가능한 것으로 보고되었다. 본 연구에서는 장기 사용레일에 대한 실내피로시험을 수행하였고, 파괴확률 50%에서의 장기 사용레일의 잔존수명을 표현한 S-N 선도는 적은 실험데이터에 대한 가중치 확률 해석기법을 사용하여 도출하였다. 여기서 피로시험에 사용된 레일들이 누적통과톤수가 서로 다르기 때문에 누적통과톤수를 평균하여 반복횟수를 수정하였다. 또한, 레일표면요철 및 열차속도를 고려한 레일 저부 휨응력은 기존 연구결과 도출된 레일휨응력 예측식을 사용하여 장기 사용레일의 잔존수명을 평가하였다. 따라서 본 연구를 통해 도시철도에서 레일연마를 통한 레일관리가 이루어진다면 누적통과톤수에 의한 레일교체기준(약 8억톤)보다 약 2억톤이상 연장 사용이 가능하며, 피로한도 이하의 응력범위에 대한 피로시험결과를 바탕으로 레일의 피로수명을 평가하기 위해서는 수정마이너법칙보다는 피로한도 이상에서의 S-N선도 기울기의 1/2인 하이바크법칙을 적용하는 것이 합리적이라 판단되었다. As a result of recent research, it is reported that the periodic replacements criterion of rails is able to extend as grinding rail surface and using the continuous welded rail(CWR). In this study, we carried out fatigue tests on existing laid rails. Based on the test results, an S-N curve expressing the remaining life of laid rails at a fracture probability of 50% was obtained using weighted probit analysis suitable for small sample fatigue data sets. As rails used for testing had different histories in terms of accumulated tonnage, the test data were corrected to average out the accumulated tonnage. We estimated the remaining service lives for laid rails on the urban railway using equations developed in the past to estimate rail base bending stress and that surface irregularities into consideration. Therefore, estimating the remaining service life of laid rails showed that the rail replacement period could be extended over 200MGT, although it is necessary to remove longitudinal rail surface irregularities at welds by grinding. Also, the fatigue test results under fatigue limit, Haibach’s rule applying half slope of S-N curve under the fatigue limit was considered more reasonable than modified Miner’s rule for estimating rail fatigue life.
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