Vertical Boxes

How to create a vertical box design in Eriksson Culvert:

Select either the “vertical box” default file from the Eriksson Culvert start-up screen, or choose the “vertical box” design type on the Culvert Properties window.
Enter the fill depth on the Culvert Properties window. This is the distance from the grade to the top of the edge of the vertical box.
If you’d like to have live load surcharge included int he design, make sure the “apply LL surcharge when LL is neglected” option is selected on the Static Loads window. Otherwise, live load surcharge will not be included as there is no live load applied.
Enter the appropriate fluid pressures on the Static Loads window.
You may select to apply additional horizontal and/or vertical uniform loads to the vertical box on the Static Loads window. You will need to choose the load type, as this is how Eriksson Culvert will apply the load in the load combinations. Note that both horizontal and vertical loads need to be set to the same values to have the load applied to all members of the vertical box.
Continue through all of the Analysis Options as you would for any other design in Eriksson Culvert.

Vertical Box Load Cases:

Horizontal Earth - The maximum horizontal soil pressure is calculated at a depth of (fill depth + culvert length). This pressure is applied as a uniform load on all members of the vertical box.
Live Load Surcharge - Live load surcharge is calculated the same as for a standard box culvert. If this load is trapezoidal, the maximum value is used. This pressure is applied as a uniform load on all members of the vertical box.
Water Pressure - The maximum water pressure at the bottom of the vertical box is calculated based on the inputs provided on the Static Loads window. This pressure is applied as a uniform load on all members of the vertical box.

Note: Dead, live, and vertical earth load cases are not applied to vertical boxes, as they act longitudinally through the culvert and are not transverse loads.