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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. Stewie