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Keywords: railway steel bridges, spherical bearing, disk bearing, line type bearing, PTFE, up-lift phenomenon.

Summary

Open steel plate girder (OPSG) bridges are the most prevalent railroad bridge type in Korea, constituting about 40% of all railroad bridges. Solid steel bearings, known as line type bearings, are placed in most OSPG railway bridges. However, the line type rigid bearings generate several problems with the bridge's dynamic behaviour and maintenance in service. To compare and investigate the dynamic behaviour of line type, spherical and disk bearings, the vertical displacements of each bearing, including fixed and expansion type, under running vehicles are measured and analysed. The displacements of disk and spherical bearings are measured after replacing the line type bearings with spherical and disk bearings. The study reported in this paper also analysed the dynamic behaviour of bridges. Furthermore, the deformation of the polytetrafluoroethylene (PTFE) plate that is placed inside of expansion type spherical and disk bearings is measured and its effect on the dynamic behaviour of the bridges is discussed. The up-lift phenomenon at the bearings installed for the steel bridges is estimated. The vertical displacements at mid-span of the bridges are compared according to the bearing types. Finally, the first mode natural frequencies are estimated, and the relationship to the vertical displacement is discussed.

The vertical displacements of the disk bearings are approximately twice of those of the spherical and line type bearings. Thus, the vertical displacements at the mid-span of the bridge are increased by the disk bearings more than the other two bearings. However, for estimating impact factors according to velocity, the values of the disk bearings are relatively small compared with the other two bearings. For the up-line phenomenon, the disk and line type bearings show a similar trend, however the spherical bearings show a smaller up-lift since they have a device to resist up-lift. The first natural frequency is increased (3.13%) by the use of disk bearings however, the spherical bearings hardly change it.

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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: 98 PROCEEDINGS OF THE FIRST INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 1 The Dynamic Behaviour of Bridge Bearings for Railway Bridges under Running Vehicles E. Choi¹, S.Y. Lee², J. Park³, K.T. Yang⁴ and B.S. Cho⁵ ¹Department of Civil Engineering, Hongik University, Seoul, Korea ²Safety Investigation Department, Korail, Daejeon, Korea ³Department of Civil Engineering, Wonkwong University, Iksan, Korea ⁴Department of Mechatronics Engineering, Daelim College, Ahnyang, Korea ⁵Department of Civil Engineering, Inje University, Kimhae, Korea doi:10.4203/ccp.98.1 purchase the full-text of this paper Full Bibliographic Reference for this paper E. Choi, S.Y. Lee, J. Park, K.T. Yang, B.S. Cho, "The Dynamic Behaviour of Bridge Bearings for Railway Bridges under Running Vehicles", in J. Pombo, (Editor), "Proceedings of the First International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 1, 2012. doi:10.4203/ccp.98.1 Keywords: railway steel bridges, spherical bearing, disk bearing, line type bearing, PTFE, up-lift phenomenon. Summary Open steel plate girder (OPSG) bridges are the most prevalent railroad bridge type in Korea, constituting about 40% of all railroad bridges. Solid steel bearings, known as line type bearings, are placed in most OSPG railway bridges. However, the line type rigid bearings generate several problems with the bridge's dynamic behaviour and maintenance in service. To compare and investigate the dynamic behaviour of line type, spherical and disk bearings, the vertical displacements of each bearing, including fixed and expansion type, under running vehicles are measured and analysed. The displacements of disk and spherical bearings are measured after replacing the line type bearings with spherical and disk bearings. The study reported in this paper also analysed the dynamic behaviour of bridges. Furthermore, the deformation of the polytetrafluoroethylene (PTFE) plate that is placed inside of expansion type spherical and disk bearings is measured and its effect on the dynamic behaviour of the bridges is discussed. The up-lift phenomenon at the bearings installed for the steel bridges is estimated. The vertical displacements at mid-span of the bridges are compared according to the bearing types. Finally, the first mode natural frequencies are estimated, and the relationship to the vertical displacement is discussed. The vertical displacements of the disk bearings are approximately twice of those of the spherical and line type bearings. Thus, the vertical displacements at the mid-span of the bridge are increased by the disk bearings more than the other two bearings. However, for estimating impact factors according to velocity, the values of the disk bearings are relatively small compared with the other two bearings. For the up-line phenomenon, the disk and line type bearings show a similar trend, however the spherical bearings show a smaller up-lift since they have a device to resist up-lift. The first natural frequency is increased (3.13%) by the use of disk bearings however, the spherical bearings hardly change it. purchase the full-text of this paper (price £20) go to the next paper return to the table of contents return to the book description purchase this book (price £110 +P&P)
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