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RE: Loads on culverts

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>Try CRSI computer program for culvert design CUDO
>web page
>very  cheap and good 
...and, very conservative.  CUDO relies on the short-form ACI equation
for shear in the top slab.  It has no ability to use the longer,
less-conservative equation.  Consequently, for multiple-span box
culverts, CUDO will substantially over-design the top slabs.  I guess
that this is yet another case of "you get what you pay for." 

Stan Caldwell, P.E.
>Dallas, Texas