Boundary
Rail Track Analysis Model Wizard
Lateral Resistance Data
Ud (Lateral Limited Displacement) : Lateral Limited Displacement
Fmax (For Stress Check) : Resistance of Ballast used in stress check
Fmax (For Displacement Check)
Resistance of Ballast used in displacement check
For the case of Ballast Bed, resistance of ballast is differently applied in stress check model and displacement check model when verifying temperature load.
If the unit of Resistance of Ballast force by unit length (ex. KN/m). Therefore, proper effective length is automatically multiplied to calculate the stiffness of Multi-Linear Elastic Link.
Define Condition
Ballast type is defined between Ballast Bed and Concrete Bed.
Advanced... : Ballast type is defined between Ballast Bed and Concrete Bed.
Boundary
Spring Type : Pier Section is not directly used in modelling but supports and point spring supports are used. Dz, Rx and Rz are restrained for the boundary condition of a roller and the SDx value defined in Horizontal Stiffness is used for the horizontal stiffness of multi-linear elastic link.
Bearing Type : Horizontal stiffness can be entered or the bottom of pier can be restrained with Point Spring Support.
Elastic Link Data
Horizontal : Vertical stiffness is internally defined as 10e7 kN/m. Vertical stiffness is internally defined as 10e7 kN/m.
Advanced... : Horizontal stiffness can be differently assigned per deck.
Elastic Link Length : Elastic Link Length can be entered as well, which represent the height of the support.
Advanced... : Users can select each deck and input the elastic link length.
Pier Data : Pier section and pier height can be defined and the support condition at the bottom of pier can be defined either Fixed or Sprint Support.
Advanced Pier Data : Users can select each deck and input the pier data.
Section : Set the section for each pier
Material : Set the material for each pier
Height : Set the height for each pier
Fixed : Set the restraint condition for the bottom of each pier. If "Fixed" is unchecked, the spring stiffness will be activated, allowing input of stiffness values for horizontal and rotational directions.
Select : Each pier has a section where the deck ends and a section where the deck begins. And select the deck information to assign to the pier data.