Question on AASHTO ASD Culvert Design - Civil Engineering - Engineer Boards
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Question on AASHTO ASD Culvert Design

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Hi, Dear All,

I got some quick questions on AASHTO ASD culvert design. The plan has some standard note telling "AASHTO 1957 --- f.s = 20000 psi, f.c = 1200 psi, n =10, V = 90 psi, U = 300 psi".
I know f.s, f.c and n. My question is on V and U.
1. Is V concrete allowable shear stress?
2. What is U?

Thank you so much for the help.


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