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한상윤(Sang-Yun Han),강영종(Young-Jong Kang),한택희(Teak-Hee Han),임남형(Nam-Hyoung Lim),김정훈(Jung-Hun Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
At high rail temperature above the neutral temperature high compressive axial stresses will occur in the rails. High thermal axial force and vehicle loads cause the track to shift in a lateral direction and the formation of track geometry imperfections (track irregularity). When the thermal stress level and track irregularity with vehicle load reach a critical value the track loses stability. In many studies the stability of CWR tracks is analyzed. However these studies are only considered in temperature load. The main objective of this investigation was to estimate a new comprehensive realistic the stability of CWR tracks considering wheel load. The ballast resistance is changed by wheel load. When the wheel load is applied rails and ties are moved upward or downward. In this case the friction between ties and ballasts is decreased or increased. In this study the change of the ballast resistance of each tie was applied to the nonlinear analysis of CWR tracks.
김효산(Kim Hyo-san),이창헌(Lee Chang-hun),공창모(Kong Chang-mo),민준호(Min Jun-ho),한택희(Han Teak-Hee),공선용(Kong Sun-Yong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The Seoul Metro Line 1~4 was constructed CWR(Countinuous Welded Rail) track more than 98.3% of main railway 277 ㎞, and expansion joints of 430 EA are installed in order to absorb the rail expansion on the CWR smoothly. In particular, the CWR installed on the bridge has irregular expansion behavior by additional stress with interaction between CWR and bridge deck. In the paper, "The Expansion Joint Measuring System" based on the wireless sensor network technology was developed to measure the expansion amount of a tongue rail and a movement rail of expansion joint with wire sensor and to simultaneously measure the atmosphere temperature and the rail temperature for the improvement of maintenance reliability. We analyzed the correlation between the atmosphere and rail temperature and the rail expansion.