Railroad Tie Responses to Directly Applied Rail Seat Loading in Ballasted Tracks : A Computational Study.
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Railroad Tie Responses to Directly Applied Rail Seat Loading in Ballasted Tracks : A Computational Study.

Filetype[PDF-892.10 KB]


English
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  • Creators:
  • Corporate Creators:
    John A. Volpe National Transportation Systems Center (U.S.)
  • Subject/TRT Terms:
  • Publication/ Report Number:
    JRC2012-74149
  • Resource Type:
    Proceedings
  • Corporate Publisher:
    American Society of Mechanical Engineers
  • Abstract:
    This paper describes work in-progress that applies the

    finite element (FE) method in predicting the responses of

    individual railroad crossties to rail seat pressure loading in a

    ballasted track. Both wood and prestressed concrete crossties

    are examined. The concrete tie is modeled as a heterogeneous

    medium with prestressing wires or strands embedded in a

    concrete matrix. The constitutive relations employed in the

    models are: elasticity followed by damaged plasticity for the

    concrete material, linear elastic bond-slip relations with

    potential initiation and evolution of damage to the bond for the

    steel-concrete interfaces, orthotropic elasticity followed by

    failure dictated by orthotropic stress criteria for the wood ties,

    extended Drucker-Prager plasticity for the granular and

    frictional ballast material, and elastic half space for the

    subgrade. The corresponding material parameters are obtained

    from the open literature.

    Under a simplified pressure load uniformly distributed

    over the rail seat area, the FE method predicts tensile cracking

    at the tie base below the rail seats of a concrete tie and

    compressive failure in the rail seats of a wood tie. The rail seat

    force-displacement relations are obtained from the simulations.

    The resultant rail seat forces at which tie failures occur are

    compared for concrete and wood ties.

    The FE method appears to be a promising tool for

    studying the railroad tie behavior under rail seat loading

    conditions in a ballasted track. Experimental data will be

    sought to calibrate the material parameters and verify the

    modeling approach. Additional track components, particularly

    rails, rail pads and fasteners, will be incorporated in future

    modeling efforts. This detailed modeling approach may help to

    shed light on the rail seat deterioration failure mechanisms

    observed in some concrete ties.

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