4.1 The precast concrete beam shown below is subjected to a live load of 1300 lb/ft and a superimposed dead load of 520 lb/ft in addition to its self-weight. Design the beams as a rectangular section. Assume interior beam, ¾" MAS, #4 stirrups, ?? ′ = 5,000 ???, normalweight, ?? = 60,000 ??? (use only #6 or #7 bars for reinforcement).
Span- 20-ft
Answer :
Given data ;
Density of concrete = 150 lb / ft ^3
live load = 1300 lb/ ft
super imposed dead load = 520 lb /ft
fc = 5000 psi
fy = 60000 psi




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