곡선부 정척레일 강재 이음매판의 종방향 구속 역해석 연구

초록

This study inversely estimated effective joint resistance from repeated measurements of joint gap and rail temperature and examined its use for comparing joint restraint conditions. Effective joint resistance (R) was defined as the threshold longitudinal resistance initiating joint slip. An elasto-frictional hysteresis model was applied to 25 measurement campaigns conducted over approximately two years at 16 joints on a curved jointed track. Point estimates for 14 identifiable joints ranged from 63 to 282 kN, with a median of 222 kN; resistance could not be uniquely identified at the remaining two low-response joints, which were classified as seized under the model. Rail-wise analysis revealed left-right restraint differences obscured by joint averages, indicating the potential use of gap-temperature records to screen targets for detailed inspection. However, the estimates have not been independently validated and remain sensitive to model assumptions and measurement frequency.

키워드