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고속철도 PSC 박스거더의 종방향 신축변위 장기거동분석
임명재(Yim Myoung-Jae),최일윤(Choi Il-Yoon),이준식(Lee Jun S),이현식(Lee Hyun-Suk) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
High-speed railway bridges subject to effect of statical loads by temperature change as well as dynamic loads by Interaction between vehicle load which run specially fast and behavior of bridges. If suitable Longitudinal expansion by temperature change of bridge does not happened, it can cause unhealthy condition for the parts of bridges as well as can generate addition stress to bridges. For these reason. Analysis and Estimation of data about behavior of bridges occupies important factor in that estimate the remaining life of bridges and select the maintenance, repair and retrofit. In this paper. Analysis for the long-term behavior of bridges using Longitudinal displacement and Temperature data that is actuality measured data to the bridges of Seoul-Busan high speed railroad test section has been made.
임명재(Yim Myoung-Jae),최일윤(Choi Il-Yoon),이준석(Lee Jun S),이현석(Lee Hyun-Suk) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
High-speed railway bridges subject to effect of dynamic loads by interaction between vehicle load which run specially fast and behavior of bridges. Such dynamic load effects result in fluctuations and fatigues to each elements as well as whole conduct of bridges, and is influenced in life of bridges. For these reason. Analysis and estimation of data about dynamic behavior of bridges occupies important factor in that estimate the remaining life of bridges and select the maintenance, repair and retrofit. In this paper. Analysis for the dynamic behavior of bridges using displacement and acceleration data that is actuality measure data to the bridges of Seoul-Busan high speed railroad test section has been made.
이현석(Lee Hyun Suk),이준석(Lee Jun Suk),최일윤(Choi Il-Yoon),임명재(Yim Myoung Jae) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Calibration and gauge factor readjustment process made for the health monitoring system installed in the railway bridges is reviewed and some findings are explained in this study: specifically, the calibrators made for this purpose are illustrated and the regression processes of the calibration on long-term displacement using water level sensor, longitudinal displacement using LVDT sensor, instantaneous displacement using LVDT sensors and accelerometer are described in details. Based on the regression results, new gauge factors are obtained from regression equation and another verification is made by performing another calibration again with new factors. From the second calibration, it was found that the suggested regression curves and their factors are appropriate and much better results are expected. Future work will be concentrated on the long-term analysis of the measurement data and on the database structures so that the assessment of the structure such as damage detection and remaining life estimation is possible.
최일윤(Choi Il-Yoon),이준석(Lee Jun S),이희업(Lee Hee-Up),임명재(Yim Myoung-Jae) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Relative displacements between decks should be within the allowable limit under horizontal forces in high-speed railway bridges. Longitudinal force transmitters(LFT) have been introduced in high-speed railway bridges for test track. The horizontal forces on the pier supporting the fixed bearings are transmitted to the near piers supporting the sliding bearings by LFT. The performance of LFT was investigated by field test in which the braking and acceleration tests using KTX were conducted in Baebang viaduct. The relative displacements between decks were measured in field test and were compared with the numerical results and the allowable limit.
최적화기법에 기초한 정적처짐을 이용한 교량의 손상평가기법
최일윤(Choi Il-Yoon),이준석(Lee Jun S),임명재(Yim Myoung-Jae),이현석(Lee Hyun Suk) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
A damage identification technique using static displacements was investigated to assess the structural integrity of bridge structures. For this, the optimization technique was utilized. In this study, structural damage was represented by the reduction in the stiffness of an element. Next, a health index of the element was introduced to estimate the stiffness reduction of the bridge under consideration. Comparisons with numerical and experimental tests were performed to investigate the applicability of the proposed method in the practical field. Various damage scenarios were considered by varying damage-width as well as damage-degree. The influence of noise on the damage identification scheme was also investigated numerically. Finally, the applicability and the limitation of the proposed method were discussed.