Moving Load Cases

Use the entered vehicle load classes and the traffic lanes to create moving load cases.

From the Main Menu select Load > Moving Load Analysis Data > Moving Load Cases.

Select Moving Load Analysis > Moving Load Cases in the Menu tab of the Tree Menu.

Moving Load Cases dialog box

To enter new or additional moving load cases

Click .

To modify previously entered moving load cases

Select the moving load case to be modified in the dialog box and click .

To delete previously entered moving load cases

Select the moving load case to be deleted in the dialog box and click .

Data entry method when is clicked.

• When AASHTO Standard is selected from Moving Load Code

   

               

  Define Moving Load Case dialog box

   

  Load Case Name

   

  Enter the name of a moving load case.

   

  Description

   

  Enter the description of the moving load case.

   

  Multiple Presence Factor

   

  Enter the scale factors for multi-lane vehicle loads.

   

  AASHTO and the Korean Specifications for Roadway Bridges specify 1.0 for loading up to two lanes, 0.9 for loading 3 lanes and 0.75 for loading 4 lanes or more.

   

  Sub-Load Cases

   

  Enter the loading method and the traffic lane to be loaded by the vehicle load class in a moving load case.

   

  Loading Effect
  Assign the method of combining vehicle loading conditions.

   

  Combined: Combination of vehicle classes. If more than two vehicle classes are assigned in a Moving Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously.

   

  Independent: Apply the vehicle classes independently.  If more than two vehicle classes are assigned in a Moving Load Case, then this function do not consider the cases where different vehicle classes are applied simultaneously

   

  Note
  When 'Independent' is selected, we can check the envelope results for each vehicle class. When ‘Combined’ is selected, we can check the envelope results for the combinations of each vehicle class.

   

   

  To enter new or additional vehicle load class

   

  Click .

   

  To modify previously entered vehicle load cases

   

  Select the vehicle load case to be modified in the dialog box and click .

   

  To delete previously entered vehicle load cases

   

  Select the vehicle load cases to be deleted in the dialog box and click .

   

  Data entry method when is clicked. [Details]

  

  Add/Modify Sub-Load Case dialog box

  Vehicle Class

   

  Select the vehicle load class or directly enter the vehicle load.

   

   

   

  Scale Factor

   

  Enter the scale factor for the application of the vehicle load class.

   

  Min. Number of Loaded Lanes

   

  Enter the minimum number of lanes to be loaded by the vehicle load class.

   

  Max. Number of Loaded Lanes

   

  Enter the maximum number of lanes to be loaded by the vehicle load class.

   

  Note
  The maximum and minimum numbers of loaded lanes must be smaller than the number of selected lanes.

   

  Assign Lanes

   

  Select the lanes to be loaded by the vehicle load class.

   

  Assign the lanes to be loaded by the vehicle load class in the traffic lane list with the mouse and click to select. If previously selected lanes are to be removed from the selection, assign the lanes with the mouse and click to delete.

   

  Note
  The number of lanes selected to be loaded is limited to 10.

• When AASHTO LRFD is selected from Moving Load Code and Permit Vehicle is considered.

  

  Define Moving Load Case (Permit Vehicle) Dialog Box

   

  Load Case Name

   

  Enter the moving load case name.

   

   Description

   

  Enter the description of the moving load case

   

   Load Case for Permit Vehicle

   

  Select this option if Permit Vehicle is defined from AASHTO LRFD Code User Define option. When this option is selected the dialog box changes to a number of input fields for Permit Vehicle.

   

  Permit Vehicle

   

  Vehicle

  Choose the vehicle to be used. The user can only choose the vehicle that has been defined as Permit Vehicle Type.

   

  Ref. Lane

  Select the reference lane to provide the location where Permit Vehicle travels.

   

  Eccentricity

  Input the distance of the Permit Vehicle to the Ref. Lane. By looking towards the direction the vehicle travels, the right side is considered positive and the left side is considered negative.

   

  Scale factor

  Enter the scale factor for the application of the vehicle loads.

• When Transverse Moving Load is selected from the Moving Load Code

  

            

            Define Moving Load Case Dialog Box

   

  Load Case Name

   

  Enter the name of a moving load case.

   

  Description

   

  Enter the description of the moving load case.

   

  Vehicle

   

  Select the vehicle for analysis. In case of inputting a vehicle that has not been defined, click on [...] tab and define any vehicle load.

   

  Scale Factor

   

  Enter the scale factor for the application of the vehicle load class.

   

  Line Lane

   

  Select the lane to be analyzed.

   

  Multiple Presence Factor

   

  Enter the scale factors for multi-lane vehicle loads.

• When BS is selected form Moving Load Code

  • When Vehicle is HA, HB or HA&HB

    

    Define Moving Load Case Dialog Box

     

    Auto Live Load Combination

     

    In the case of HA&HB(Auto), combination of the Live Load is automatically organized based on the selected code. In the case of HA, HB or HA&HB, this option should be checked off.

     

     Type of Design Combination Factor

     

    Select a limit state to determinate load factors to be applied to the moving load analysis results.

    Ultimate Limit State: Applies the load factor at ultimate limit state

    Serviceability Limit State: Applies the load factor at serviceability limit state

     

     Combination of Loads

     

    Select a combination to determinate load factors to be applied to the moving load analysis results.

    Combination 1: Applies the load factor for combination 1

    Combination 2 or 3: Applies the load factor for combination 2 or 3

     

     Sub Load Case (When Vehicle is HA, HB, HA&HB, Pedestrian)

     

     

    

    Sub Load Case Dialog Box

     

    Load Case Data

    Scale Factor: Enter the scale factor for the application of the vehicle loads.

    Number of Loaded Lanes: Enter the number of lanes to apply for Moving Load Cases. The selected lanes and the number of lanes inputted should be the same.

    Vehicles: Enter the type of vehicle to consider for Moving Load Cases

    Assign Lanes

    Assign the selected vehicles to lanes

    List of Lanes: Displays the list of lanes

    Selected Lanes: Select the lane

    HB Straddling Two Lanes: Becomes activated only in the case of HA&HB(Auto)

   

  • When Vehicle is HA&HB (Auto)

    

    Define Moving Load Case Dialog box

     

     Auto Live Load Combination

     

    In the case of HA&HB(Auto), combination of the Live Load is automatically organized based on the selected code. In the case of HA, HB or HA&HB, this option should be checked off.

     

     Type of Design Combination Factor

     

    Select a limit state to determinate load factors to be applied to the moving load analysis results.

    Ultimate Limit State: Applies the load factor at ultimate limit state

    Serviceability Limit State: Applies the load factor at serviceability limit state

     

     Combination of Loads

     

    Select a combination to determinate load factors to be applied to the moving load analysis results.

    Combination 1: Applies the load factor for combination 1

    Combination 2 or 3: Applies the load factor for combination 2 or 3

     

     Sub Load Case (When Vehicle is HA&HB (Auto))

     

    If a number of Sub-Load Cases are defined in a Load Case, Min/Max result values from all the Sub-Load Cases are generated. That is, analysis is separately performed for each Sub-Load Case, and the Sub-Load Cases are not combined for analysis.

     

     

    

    Sub Load Case Dialog Box

     

    Load Case Data

    Scale Factor: Enter the scale factor for the application of the vehicle loads.

    Number of Loaded Lanes: Enter the number of lanes to apply for Moving Load Cases. The selected lanes and the number of lanes inputted should be the same.

    Vehicles: Enter the type of vehicle to consider for Moving Load Cases

    Assign Lanes

    Assign the selected vehicles to lanes

    List of Lanes: Displays the list of lanes

    Selected Lanes: Select the lane

    HB Straddling Two Lanes: Select the two adjacent lanes on which HB loading shall occupy any transverse position. To use this function more than two Cross Beam Type lanes should exist.

   

  • When Vehicle is Pedestrian

    

    Define Moving Load Case Dialog Box

     

     Auto Live Load Combination

     

    Select whether automatic live load combination is needed for pedestrian load.

     

    Type of Design Combination Factor

     

    Select a limit state to determinate load factors to be applied to the moving load analysis results.

    Ultimate Limit State: Applies the load factor at ultimate limit state

    Serviceability Limit State: Applies the load factor at serviceability limit state

     

     Combination of Load

     

    Select a combination to determinate load factors to be applied to the moving load analysis results.

    Combination 1: Applies the load factor for combination 1

    Combination 2 or 3: Applies the load factor for combination 2 or 3

     

     Sub Load Case (When Vehicle is HA, HB, HA&HB, Pedestrian)

     

     

    

    Sub Load Case Dialog Box

     

    Load Case Data

    Scale Factor: Enter the scale factor for the application of the vehicle loads.

    Number of Loaded Lanes: Enter the number of lanes to apply for Moving Load Cases. The selected lanes and the number of lanes inputted should be the same.

    Vehicles: Enter the type of vehicle to consider for Moving Load Cases

    Assign Lanes

    Assign the selected vehicles to lanes

    List of Lanes: Displays the list of lanes

    Selected Lanes: Select the lane

    HB Straddling Two Lanes: Becomes activated only in the case of HA&HB(Auto)

     

• When EUROCODE is selected from Moving Load Code

  

  Define Moving Load Case dialog box (when LM1, FLM1 is selected)

   

   

  Load Case Name: Enter the name of a moving load case.

   

  Description: Enter the description of the moving load case.

   

  Ignore ψ Factor: Check on to neglect ψ factor. If the traffic load is considered as Leading Variable Action in the load combination as per Eurocode 4, the moving load case for which the ‘Ignore ψ factor’ option is checked on will be used. In this case, the ψ factor entered for the vehicle used in the corresponding load case will not be used. (That is ψ factor is considered as 1.)

   

  Vehicle: Select the vehicle to be used. The user can only choose Load Model 1 or FLM 1.

   

  Assignment Lanes

   

  List of Lanes: Display the list of defined lanes.

   

  Selected Lanes: Select the lane to be loaded by the vehicle load.

   

  Remaining Area: Select the lane to be used as the Remaining Area as set forth in Eurocode.

   

  

   

  Define Moving Load Case dialog box (when LM 2,3,4 / FLM2,3,4 / Footbridge is selected)

   

  Sub-Load Cases

   

  Enter the loading method and the traffic lane to be loaded by the vehicle load class in a moving load case.

   

  Loading Effect: Assign the method of combining vehicle loading conditions.

   

  Combined: If more than two vehicle classes are assigned in a Sub-Load Case, then this function considers all combinations, including the cases where different vehicle classes are applied simultaneously.

   

  Independent: Apply the vehicle classes independently.  If more than two vehicle classes are assigned in a Sub-Load Case, then this function do not consider the cases where different vehicle classes are applied simultaneously.

   

  To enter new or additional vehicle load class, click and enter the following data.

   

  To modify previously entered vehicle load cases, select the vehicle load case to be modified in the dialog box and click .

   

  To delete previously entered vehicle load cases, select the vehicle load case to be deleted in the dialog box and click .

   

   

  Load Cases Data

   

  Vehicle Class: Select the vehicle load class.

   

  Min. Number of Loaded Lanes: Enter the minimum number of lanes to be loaded by the vehicle load class.

   

  Max. Number of Loaded Lanes: Enter the maximum number of lanes to be loaded by the vehicle load class.

   

   

  Assignment Lanes

   

  Select the lanes to be loaded by the vehicle load class.

   

  Assign the lanes to be loaded by the vehicle load class in the List of Lanes with the mouse and click to select. If previously selected lanes are to be removed from the selection, assign the lanes with the mouse and click to delete.

   

   

  Define Moving Load Case dialog box (when LM 1 & 3 Multi is selected)

   

  The input dialog box is identical to "LM1, FLM1" except that Load Model 1and Load Model 3 can be selected simultaneously in "LM1 & 3 Multi".