Function
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Train Load Generator extracts and plots graphs of time-forcing function of high speed train. Also, dynamic nodal loads can be created to perform time-history analysis. This feature is intended for the vibration check of long span bridges due to fast moving train load.
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Time-forcing functions can be generated without considering the lengths of the elements along the track. The nodal spacing along the track is automatically detected by the program.
Call
From the main menu, select [Load] tab > [Type : Dynamic Loads] > [Time History Analysis Data] group > [Train Load Generator]
Input
Define Tracks
2 points : Beam elements in a line defined by 2 points are assigned as traffic line lane elements. The first point becomes the Start point.
Picking : Assign the traffic line lane elements with the mouse. The location of the first-assigned element becomes the Start point.
Number : Enter the element numbers pertaining to the traffic line lane elements. The location of the first-assigned elements becomes the start point.
Operation
The data entry is reflected when Selection by Number is selected
Add : Add to the selected elements.
Insert : Insert the selected elements in between the previously entered elements.
Delete : Select the elements at the bottom of the dialog box and delete.
Dynamic Load Case
Select the dynamic load case from the drop-down, to which the dynamic nodal loads will be added.
Name
Enter the name of time-forcing function. Depending on the nodal spacing, a number of time-forcing functions will be generated. The name of each function will be Name_f001, Name_f002, Name_f003, ...
Vehicle Code
If Korea is selected in the vehicle code:ehicle Code,
Vehicle Type : Vehicle load can be selected from the drop-down list.
If User-defined is selected in the vehicle code,
The vehicle needs to be defined manually. The length for the first axle should be zero.
Add : Add a new set of length and force.
Modify : Modify existing data.
Delete : Delete an existing data.
Insert : Insert a new data between two existing data.
Length : Spacing between 2 axle loads
Force : Value of axle load
Train Velocity
Enter the train velocity. Unit is fixed as km/h.
Scaling
Scale Factor::Scale factor to be provided to time-forcing function.
Time
Start Time: Start time of time-forcing function.
Open
Open an existing train load generator file.
Save as
Save the current train load generator file.
Import
When you enter the axial interval, load using the user defined fuction, you can create it in Excel format. And the form is shown below.
Show Graph
Display the time-forcing function of dynamic train load for each node.