(Due within a day and 15 hrs)
Problem 13.3.A. A rectangular concrete beam has fc = 3000 psi [20.7 MPa] and
steel with fy = 40 ksi [276 MPa]. Select the beam dimensions and reinforcement
for a balanced section if the beam sustains a moment due to dead load of
60 kip-ft [81.4 kN-m] and a moment due to live load of 90 kip-ft [122 kN-m].
TABLE 13.3 Minimum Required Tension
Reinforcement for Rectangular Sectionsa
fc (psi)
3000
4000
5000
fy = 40ksi
0.0050
0.0050
0.0053
fy = 60ksi
0.00333
0.00333
0.00354
aRequired As equals table value times bd of the beam
section.