Structural Concrete - Hassoun

488 Chapter 13 Footings
Table 13.1 Problem 13.1
Number
Wall
Thickness (in.)
Dead
Load (K/ft)
Live
Load (K/ft)
f ′ c
(Ksi)
q a
(Ksf)
H
(ft)
Part Answers
a 12 22 12 3 4 5 10 19
b 12 18 14 3 5 4 7.5 17
c 14 28 16 3 6 6 8.5 20
d 14 26 24 3 4 5 14.5 27
e 16 32 16 3 5 5 11 23
f 16 24 20 4 6 8 9 19
g 14 20 18 4 4 6 11.5 19
h 14 28 20 4 5 4 10.5 21
i 12 18 14 4 6 5 6 14
j 14 16 20 4 6 5 7 16
L
(ft)
H
(in.)
Table 13.2 Problem 13.2
Number
Column
(in.)
Column
bars
Dead
Load (K)
Live
Load (K)
f ′ c
(Ksi)
q s
(Ksf)
H
(ft)
Part Answers
a 16× 16 8 no. 8 150 115 3 5 6 8 20
b 18× 18 8 no. 9 160 100 3 6 5 7 19
c 20× 20 12 no. 9 245 159 3 6 7 9 23
d 12× 12 8 no. 8 180 140 3 5 8 9 24
e 14× 14 8 no. 9 140 160 4 5 6 8.5 21
f 16× 16 8 no. 9 190 140 4 4 5 10 21
g 18× 18 12 no. 8 200 120 4 6 7 8 20
h 20× 20 12 no. 9 195 195 4 5 8 10 22
i Dia. 20 8 no. 9 120 85 4 5 5 7 16
j Dia. 16 8 no. 8 110 90 3 4 6 8 18
L
(ft)
H
(in.)
13.6 Design a rectangular combined footing to support the two columns shown in Fig. 13.31. The center of
the exterior column is 1 ft away from the property line and 14 ft from the center of the interior column.
The exterior column is square with 18-in. sides, is reinforced with no. 8 bars, and carries an axial dead
load of 160 K and a live load of 140 K. The interior column is square with 20-in. sides, is reinforced
with no. 9 bars, and carries an axial dead load of 240 K and a live load of 150 K. The bottom of the
footing is 5 ft below final grade. Use f ′ c = 4ksi, f y = 60 ksi, and an allowable soil pressure of 5 ksf.
Figure 13.31 Problem 13.6.