Volpe The National Transportation Systems Center. Finite Element Analysis of Wood and Concrete Crossties Subjected to Direct Rail Seat Pressure. U.S. Department of Transportation Research and Innovative Technology Administration John A. Volpe National Transportation Systems Center.
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Finite Element Analysis of Wood and Concrete Crossties Subjected to Direct Rail Seat Pressure
U.S. Department of Transportation
Research and Innovative Technology Administration
John A. Volpe National Transportation Systems Center
Hailing Yu and David Jeong
Structures and Dynamics Division
VolpeThe National Transportation Systems Center
Advancing transportation innovation for the public good
L: parallel to fiber
T: perpendicular to fiber and tangent to growth rings
R: normal to growth rings
Based on properties of the white oak species described in Bergman, R., et al., “Wood handbook - Wood as an engineering material,” General Technical Report FPL-GTR-190, U.S. Department of Agriculture, Forest Service, Forest Products Laboratory: 508 p. 2010.
dc – compressive damage variable
d – stiffness degradation variable (a function of dt and dc)
n – normal direction
s, t – shear directions
Normal traction tn
Shear tractions ts, tt
Quadratic nominal stress criterion for damage initiation
Absolute rail seat displacement
Rail seat displacement relative to tie base