Analysis and Design of T Beams and Doubly Reinforced Beams - Design of Reinforced Concrete - page 142

5.21 Determine the amount of reinforcing steel required for each T beam in the accompanying illustration if f y
60,000 psi. 4000 psi, simple span 24 ft, clear distance between stems 3 ft, M D 200 ft-k (includes effect of
concrete weight), and M L 400 ft-k ( Ans. 6.80 in. 2 )

c

f

5.22 Select the tensile reinforcing needed for the T beams if the reinforced concrete is assumed to weigh 150 lb/ft 3 and
if a live floor load of 150 lb/ft 2 is to be supported. Assume 40 ft simple spans and f y 60,000 psi and

c

f 4000 psi.

4"

22" 30"

15" 15"

15"

4"

10' 0" 10' 0"

10' 0" 10' 0"

c

5.23 With f y 60,000 psi and 4000 psi, select the reinforcing for T beam AB for the floor system shown. The live
load is to be 80 psf, while the dead load in addition to the concrete's weight is to be 100 psf. Concrete is assumed to
weigh 150 lb/ft 3 . The slab is 4 in. thick, while d is to be 24 in. and b w is 15 in. ( Ans. 5.01 in. 2 Use four #10 bars)

f

A

edge
L beam

T beams

32'

B

5' 4 @ 12' = 48'

5'

5.24 Repeat Problem 5.23 if the span is 36 ft and the live
load is 120 psf.

5.25 Prepare a flowchart for the design of tensilely rein-
forced T beams with 0.9.