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If “variable” is selected ETCulvert Eriksson Culvert 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 Eriksson Culvert will not select a member thickness smaller than this value. You may input 0 here, in which ETCulvert Eriksson Culvert will use a minimum of 3”.
If “fixed” is selected ETCulvert Eriksson Culvert 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”.
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For an LRFD or CHBDC Specification run, square precast units should be run with the perpendicular clear span and appropriate roadway skew angle, however, skewed precast units should be run with the skewed clear span, a single lane of traffic parallel to main reinforcement and a roadway skew angle of zero degrees. Note that the bar schedule output by the program for a skewed end precast unit is actually the bar schedule of a square unit. The size/spacing pairs and some of the lengths will be correct, but other lengths and most of the weights will be larger than actual construction.
Left End Skew
For cast-in-place culverts only, input the skew angle for the left end of the culvert defined as the angle between the left face of the culvert and the centerline of the culvert (‘LEFT SKEW’ in the following diagram).
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