Question

Design (give the cross section) for a 10 ft. long simply supported plain (unreinforced) concrete beam that is capable of supporting its own self weight plus a 270 lb Razorback football player at midspan without cracking (stress at bottom less than modulus of rupture). Use a unit weight of concrete of 145 pcf, try to minimize the concrete area (optimized design). Be careful of units. f’_c = 4,000 psi.

Answer 1

Soluction Gtiven Tha tocight plus P2ao b Assume pl

20 x lo bdf ha) 2 S20 3.2 d 2 - I 128 jnch 3 2 inc Pnovide beam sechon of n oide ick