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  1. 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
  2. Hey all- I'm gearing up for the October SE Vertical exam and have a quick question regarding ASD vs LRFD. I don't have the 13th edition of the AISC manual that combines LRFD and ASD and have done nearly all of my steel design (not program based) by ASD. All information I had read to date says "examinees will have the option to work problems in ASD or LRFD". I'm working through a few sample problems and some specify which IBC combination to use, one of which is a steel design problem specifying and LRFD combo. Are you restricted to LRFD in this case? If so, I need to get my hands on a revised steel manual. Thanks and good luck to all preparing for the exam.
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