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

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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.

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Abbreviations

\(c\) :

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

F s :

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

W rail :

Unit weight of two pieces of 60E1 rail

W slab :

Unit weight of concrete track slab

W trian :

Unit weight of train

\(\alpha\) :

Inclination angle of dowel bar

μ :

Frictional coefficient of sliding layer

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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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Authors and Affiliations

  1. Department of Civil Engineering, Dankook University, Yongin, 16890, Republic of Korea

    Hyun Sung Choi & Jungwhee Lee

  2. Railroad Structure Research Team, Advanced Railroad Civil Engineering Division, Korea Railroad Research Institute, Uiwang, 16105, Republic of Korea

    Kyoung-Chan Lee

  3. Department of Civil Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea

    Seong-Cheol Lee

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  1. Hyun Sung Choi
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  2. Kyoung-Chan Lee
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Correspondence to Kyoung-Chan Lee.

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Choi, H.S., Lee, KC., Lee, SC. et al. Interaction Analysis of Sliding Slab Track on Railway Bridge Considering Behavior of End-Supporting Anchors. Int J Steel Struct 19, 1939–1950 (2019). https://doi.org/10.1007/s13296-019-00255-x

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