No. Boxes
Input the number of boxes, between 1 and 4.
Design Type
Select the type of culvert to be designed, either three of four sided.
Support Types
Select the type of supports to model the culvert. This option is only enabled if three-sided is selected for the design type. The options are pin-roller, pin-pin, and fixed-fixed (note that fixed-fixed is only available for cast-in-place culverts.
Clear Span
Input the culvert clear span as the dimension in the horizontal or x-direction of the open area of the culvert. Typically this is measured between the inside faces of adjacent walls parallel to the span of the top and bottom slabs.
Clear Height
Input the culvert clear height as the dimension in the vertical or y-direction of the open area of the culvert. Typically this is measured between the inside face of the top slab and the inside face of the bottom slab (or the bottom of the walls for 3-sided culverts).
Length
Input the culvert section length as the distance between joints, measured along the culvert centerline. If your culvert has no joints, then input the entire length of the culvert. This value is used in the creation of the bar schedule in both Design and Analysis Modes. The culvert length will also be used as live load distribution width for fill depths less than 2 feet (STND and AREMA), if the assigned length is less than the calculated distribution width.
Eriksson Culvert is a design program, not a detailing program; the bar lengths in Eriksson Culvert are primarily for estimation purposes and are meant to provide a means to compare design options. Actual drawing and production demands may require adjustments to bar lengths to accommodate local codes and construction practices or plant specific production methods.
Fill Depth
Input either a single fill depth or a range of fill depths. If analyzing the culvert over a range of fill depths then values for the maximum fill depth, minimum fill depth, and increment must be input. The culvert will then compute fill depths from the minimum depth to the maximum depth at the value of the increment, inclusive of both the maximum and minimum values. If the value of 1.99 ft is between the maximum and minimum values then it will also be included in the analysis. For example, if the minimum value is specified as 0 ft, the maximum values is specified as 2.3 ft, and the increment as 0.5 ft, then the fill depth values included in the analysis will be: 0.0, 0.5, 1.0, 1.5, 1.99, 2.0, and 2.3 ft.
Use Range of Fill Depths
Check this box to input a range of fill depths.
Fill Depth/Max. Fill Depth
Input the fill depth value if analyzing culvert at a single fill depth or input the maximum fill depth if analyzing the culvert over a range of fill depths.
Min. Fill Depth
Input the minimum fill depth if analyzing the culvert over a range of fill depths.
Increment
Input the increment value for the range of fill depths. If the difference between the maximum and minimum fill depths is not evenly divided by the assigned increment, then the last increment checked will be smaller.
Variable/Fixed Member Thicknesses
In Design Mode you have the option to choose between variable and fixed thicknesses for all members:
If “variable” is selected ETCulvert will select the most efficient thickness for each member during the design process. Note that next to this option is “Min. Thickness”; by specifying a value for this, ETCulvert will not select a member thickness smaller than this value. You may input 0 here, in which ETCulvert will use a minimum of 3”.
If “fixed” is selected ETCulvert will not size the member, and instead use the value specified in the “Thickness” option. Note that the minimum thickness you can enter is 3”.
In Analysis Mode, enter the exact values for the slabs and walls. Note that some agencies impose specific minimum slab thicknesses. If you have not selected any specific governing agency, then the minimum thickness of all members is 3 inches. Note that in analysis mode, you may not change the member thickness flag (fixed or variable) for any member. Also, based on the clear span and clear height, the program may require you to input a member thickness in excess of the absolute minimums. This is to insure that the program can assign rebar that fits within the section.
Added Thickness for Bottom Slab
Input additional thickness for the bottom slab needed for a V-Bottom in the bottom slab at the intersection of the bottom slab and the side walls. This is also sometimes called a “fish bottom”.
Top Haunch
Input the X (horizontal) and Y (vertical) dimensions for the top haunch if there is one. To form a 45 degree haunch use the same dimension for both X and Y. Both top haunches will have the same dimensions.
Note that the use of the haunch in the FEM analysis model is dependent on the options selected on the Analysis Options page. See the discussion on that page for more information.
Bottom Haunch
Input the X (horizontal) and Y (vertical) dimensions for the bottom haunch if there is one. To form a 45 degree haunch use the same dimension for both X and Y. Both bottom haunches will have the same dimensions.
Note that the use of the haunch in the FEM analysis model is dependent on the options selected on the Analysis Options page. See the discussion on that page for more information.