Truck Analysis List
A list of trucks that have been added to the analysis. The user may select whether or not to include each of these truck by checking or unchecking the box next to its name. Note that you must have included at least one truck to analyze. Clicking on the truck’s name itself will select the truck and display the assigned design and rating parameters to the right.
Add Truck to Analysis
This button will take the user to the Vehicle Library, where you may select a new truck to add to the truck analysis list.
Properties
This button will take the user to the Vehicle Properties dialog box, where you will be able to edit the highlighted vehicle’s properties.
Load Configuration
This button takes the user to a standard Windows open file dialog box where you will be able to select and import a previously saved truck configuration file.
Save Configuration
This button takes the user to a standard Windows save file dialog box where you will be able to save the currently displayed truck configuration.
Vehicle Design and Rating Parameters
The Vehicle Design and Rating Parameters allows the user to modify the following properties for the selected truck in the analysis truck list (to the left).
Vehicle Type
The user has the option of setting the vehicle type to be either design, legal, or permit, and modifying the rating load factors. Depending on the specification, all vehicle types may or may not be available. Note that these live load factors will only be applied to the ratings calculations.
There are separate design live load factors that will be applied to the flexure and shear calculations (which can be accessed through the Load and Resistance Factors dialog box).
Override MPF
User can select to override the MPF factor for a single lane under LRFD only. If the user selects to override the MPF, the program will then restrict the moving load analysis to a single lane, regardless of the assigned overall culvert width.
Design Load Combinations
For LRFD, select either a Strength I or Strength II design. For STND or AREMA, the user can select between Group I or Group IB. CHBDC users only have one design load combination available.
DLA / Impact
The user has the option to select whether they want to Eriksson Culvert to compute or if they want to specify the percent DLA. If selected, input a new factor as a percentage. This impact will be applied at all fill depths and for any number of axles.
Traffic Direction
Select the direction of the lanes relative to the main reinforcement. The lanes can be placed as either parallel or perpendicular to the main reinforcement. The most common traffic direction for a box culvert is parallel. Use the perpendicular direction to model storm drains that run parallel to streets and roads. Under LRFD and CHBDC, the perpendicular direction may also be used to account for skewed culverts.
Max Number of Lanes
Select how the max number of lanes is to be determined. Select Computed by Program to have Eriksson Culvert determine an appropriate value for max number of lanes or select Specify Number of Lanes to choose a value from 1 to 4. Note that with some combinations of fill depth and traffic direction the number of lanes is set to 1 internally and cannot be changed. Also, if the user selects a Strength II load combination, the program will set the number of lanes equal to 1, and again in this case this value cannot be overridden by the user. Under AREMA the number of lanes is always equal to 1, and cannot be overridden by the user.
Include Lane Load
Check to have the lane load included with the live load. Note that there is no option to neglect the lane load in the vehicle properties input window, although you can achieve the same result by setting the lane load equal to zero.