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권구성(Ku-Sung Kwon),정원석(Won-Seok Chung),장승엽(Seung-Yup Jang) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The passage of railway vehicles generates mechanical vibrations and noises. This problem can be mitigated by the'floating slab track' that isolating from infrastructures by installing vibration isolator in the concrete slab track. In the previous researches adjacent floating slab tracks are connected by dowel bar system. It has been reported that many dowel bars with less diameter show better load transfer efficiency (LTE) compared to small number of dowel bars with larger diameter under the condition of the same dowel area. In this study dowel system is further considered as a concrete anchorage system and the design strength of the dowel system was evaluated based on ACI code 318-08 Appendix D. The design strength of dowel system is then verified against failure load test of floating slab system.
강상형 철도교의 도상종류와 형고에 따른 동특성 및 안정성 연구
윤지홍(Ji-Hong Yun),최권영(Kwon-Young Choi),권구성(Ku-Sung Kwon),안주옥(Ju-Ok An),정원석(Won-Seok Chung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Railway bridges are highly susceptible to resonance due to the equidistant axle load with constant speed of train. Thus it is inevitable verify dynamic characteristics and quantities against dynamic guidelines. Recently various new-type bridges are developed and applies to medium span length between 30m and 40m. However just steel box girder bridge is under review for span length between 45m and 50m without development any new technologies. This study investigate the dynamic properties and safety of steel box railway bridge having span length 45m in alternative girder hight and kind of ballast. Numerical analysis is performed time series analysis by mode superposition using calculated natural vibration frequency and mode after carry out a free vibration analysis and extract modal parameter to higher modes. The results are then compared to various dynamic stability standards toward target bridge's dynamic stability analysis. The result of this study is expected as a reference for design railway bridges.