Layout
Rail Track Analysis Model Layout dialog box
Bridge Data
Bridge Material : Define material for the superstructure of a bridge by using material properties previously defined in Material Properties dialog box.
Deck Information : Input the number of decks and their lengths, where each deck length is the center-to-center (c/c) distance between adjacent deck expansion joints.
4@50, 70 : 4 decks of 50 m each and a deck of 70 m compose a bridge of 270 m.
Embankment Length : Enter the embankment length.
Multi Curve : The curvature can be defined for a combination of straight and curve geometries.
Rail : Rail follows a curved alignment (transition/circular) while the deck remains straight.
Rail/Deck : Both rail and deck follow the same curvature.
Straight Line : The start and end location of the straight line.
Circular Curve : The start and end locations of the plan curve with specified radius of the curve point.
Radius
Specify the radius for a horizontally curved bridge.
Auto-definition of Nodal Local Axis according to Curvature Radius information.
Convex : Convex curvature (center of circle located below the curve).
Concave : Concave curvature (center of circle located above the curve).
Transition Curve : The start and end locations of the transition curve with specified radius of the curve point.
Span Type : Define support condition and span length for the bridge. The program provides four most frequently used types.
Advanced... : User can define the span conditions and span lengths for model. The software also allows you to model the exact physical location of expansion joints and support edge distances.
Simply enter the values as shown in the Guide Diagram to ensure the model matches your bridge layout.
If the maximum number of span was entered as 4, then four slots will be available for span length (Span Length = center-to-center (c/c) distance between bearings/supports). The values for the span lengths are to be entered sequently, which should not exceed the total length of the deck. If exceeded, the remaining slots will be locked once exceeded.
Rail Data
Rail Material : Define rail materials by using material properties previously defined in Material Properties dialog box.
Number of Track : Enter the number of tracks (Max = 2).
Additional Check : Define additional verification conditions commonly applied to both cases.
Zero Longitudinal Resistance : Zero Longitudinal Resistance can be defined. When an additional stress exceed a certain level, zero lateral resistance can be installed to reduce the additional stress. It is defined with respect to the left end of the embankment and with zero resistance of ballast at the defined section.
Rail Expansion Joints : When Zero Longitudinal Resistance is not capable to reduce the additional stress to a certain level, Rail Expansion Joints can be installed. The location of Rail Expansion Joints refers to its left end when defined.