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Keywords: railway bridge, passenger comfort, vertical displacement limit.

Summary

Dynamic response of a bridge should be restricted in order to secure passenger comfort and traffic safety during the passage of the train. Especially dynamic displacements of the bridge are one of the most important factors for securing passenger comforts of railway bridges. Therefore, design standards including the Eurocode and the Shinkansen Code standardizes the limitation of the dynamic response of the bridge. However, these specifications are defined only within the design speed of 350km/h (360km/h in the case of the Shinkansen Code) and within a span length of 120m (100m in the case of the Shinkansen Code). In the present paper, with the current trend of increasing the speed of the train and increasing the span length of the bridge, we develop new vertical displacement limitations for railway bridges to secure passenger comfort. The time-dependent comfort limit on bridge structures is used, which is one of the vibration serviceability vertical acceleration limits that consider vibration duration. It is able to take into account the change in discomfort levels perceived by the human body according to the vibration duration. The influence of bouncing and pitching movements on vehicle behavior was also investigated. In addition, a bridge-train transfer function was developed from the single mass spring system. A parameter study and a bridge-vehicle interaction analysis was conducted in order to determine the correlation between the vertical acceleration of the vehicle and bridge displacement according to the increase in the travel speed. An acceleration amplification coefficient was developed using the results of the parameter study and bridge-vehicle interaction analysis. The shape of the deflection and vibration of the bridge was assumed to be sinusoidal with harmonic motion; the vibration transfer function and acceleration amplification coefficient were used to develop a formula that determines the allowable dynamic displacements for railway bridges and organize them according to the train speed and the span length of the bridge.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 134 Evaluation of the Vertical Displacements Limit of Railway Bridges for Securing Passenger Comfort S.I. Kim¹, N.S. Kim², B.G. Jeon² and C.E. Kim³ ¹Advanced Infrastructure Research Team, Korea Railroad Research Institute, Uiwang, South Korea ²Department of Civil & Environmental Engineering, Pusan National University, South Korea ³Technical Institute, Samhyun P.F Co., Ltd., Seoul, South Korea doi:10.4203/ccp.110.134 purchase the full-text of this paper Full Bibliographic Reference for this paper S.I. Kim, N.S. Kim, B.G. Jeon, C.E. Kim, "Evaluation of the Vertical Displacements Limit of Railway Bridges for Securing Passenger Comfort", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 134, 2016. doi:10.4203/ccp.110.134 Keywords: railway bridge, passenger comfort, vertical displacement limit. Summary Dynamic response of a bridge should be restricted in order to secure passenger comfort and traffic safety during the passage of the train. Especially dynamic displacements of the bridge are one of the most important factors for securing passenger comforts of railway bridges. Therefore, design standards including the Eurocode and the Shinkansen Code standardizes the limitation of the dynamic response of the bridge. However, these specifications are defined only within the design speed of 350km/h (360km/h in the case of the Shinkansen Code) and within a span length of 120m (100m in the case of the Shinkansen Code). In the present paper, with the current trend of increasing the speed of the train and increasing the span length of the bridge, we develop new vertical displacement limitations for railway bridges to secure passenger comfort. The time-dependent comfort limit on bridge structures is used, which is one of the vibration serviceability vertical acceleration limits that consider vibration duration. It is able to take into account the change in discomfort levels perceived by the human body according to the vibration duration. The influence of bouncing and pitching movements on vehicle behavior was also investigated. In addition, a bridge-train transfer function was developed from the single mass spring system. A parameter study and a bridge-vehicle interaction analysis was conducted in order to determine the correlation between the vertical acceleration of the vehicle and bridge displacement according to the increase in the travel speed. An acceleration amplification coefficient was developed using the results of the parameter study and bridge-vehicle interaction analysis. The shape of the deflection and vibration of the bridge was assumed to be sinusoidal with harmonic motion; the vibration transfer function and acceleration amplification coefficient were used to develop a formula that determines the allowable dynamic displacements for railway bridges and organize them according to the train speed and the span length of the bridge. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
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