A normal-weight plain  concrete beam  is 6 in.  x  12 in. is simply  supported on a span of  4  ft and is subjected to a  midspan concentrated load of  4500 lb. Assume f’c  =  3,000 psi, and concrete  unit  weight  is 150  lb/cf. Calculate  the  maximum concrete tensile  stress  using both methods, and compare it  with the value  for modulus of  rupture (fr) using the ACIrecommended value  based on f’c.

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Pressure and Stress