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International Journal of Steel Structures

, Volume 19, Issue 6, pp 1939–1950 | Cite as

Interaction Analysis of Sliding Slab Track on Railway Bridge Considering Behavior of End-Supporting Anchors

  • Hyun Sung Choi
  • Kyoung-Chan LeeEmail author
  • Seong-Cheol Lee
  • Jungwhee Lee
Article
  • 96 Downloads

Abstract

Railway bridges with a continuously welded rails are subject to track-bridge interactions due to temperature changes and train load, which cause an additional axial force on the rail. The recently developed sliding slab track can significantly reduce the axial force on the rail caused by such interactions by placing a low frictional sliding layer between the track slab and the bridge deck and separating the longitudinal movement of the bridge from that of the track. In this study, the anchor in the fixed support region, which is an important component of the sliding slab track, was analytically evaluated to derive the load–displacement relationship, and the track-bridge interaction of the continuous bridge with the sliding slab track was analyzed considering the derived relationship. The anchor was examined for the cases of infinite stiffness, consistent stiffness, and damaged state; the stiffness of the anchor reached 10% of the original. There were no significant differences in the rail stress, track slab axial force, and rail displacement when the stiffness of the anchor was interpreted as infinite. Although the displacement of the rail increased when the anchor was damaged, there was no significant increase in the rail stress or the track slab axial force. It was confirmed, however, that the damaged anchor must be repaired as early as possible because the damage can develop rapidly as the displacement of the damaged anchor significantly increases.

Keywords

CWR Railway bridge End-supporting anchor Track–bridge interaction Sliding slab track 

List of Symbols

\(c\)

Length of crushed concrete zone

\(d_{b}\)

Diameter of dowel rebar

\(D\)

Dowel force

\(D_{u}\)

Maximum Dowel force

\(E_{s}\)

Dowel bar modulus of elasticity

\(f_{b}\)

Concrete bearing strength

\(f_{c}^{'}\)

Concrete compressive strength

\(f_{y}\)

Yield strength of dowel rebar

Fs

Frictional force of sliding layer

\(K_{f}\)

Concrete foundation modulus (271.7 MPa/mm)

N

Normal force

\(S\)

Dowel deflection

\(S_{u}\)

Dowel deflection at \(D_{u}\)

\(T\)

Dowel bar axial force

\(T_{y}\)

Dowel bar yield axial force

Wrail

Unit weight of two pieces of 60E1 rail

Wslab

Unit weight of concrete track slab

Wtrian

Unit weight of train

\(\alpha\)

Inclination angle of dowel bar

μ

Frictional coefficient of sliding layer

Notes

Acknowledgements

This research was supported by a Grant (17RTRP-B071566-05) from Railroad Technology Research Program funded by Ministry of Land, Infrastructure and Transport of the Korean government and supported by Korea Railroad Research Institute.

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Copyright information

© Korean Society of Steel Construction 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringDankook UniversityYonginRepublic of Korea
  2. 2.Railroad Structure Research Team, Advanced Railroad Civil Engineering DivisionKorea Railroad Research InstituteUiwangRepublic of Korea
  3. 3.Department of Civil EngineeringKyungpook National UniversityDaeguRepublic of Korea

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