Design of square footing for a single column - Reinforced Concrete with FRP Bars: Mechanics and Design - page 363

The average soil pressure, q ave , relative to each load combination can be
computed as follows:
Load combination 1:

P+S
A

s1 total

q: = =2.65ksf ⋅ ave1

footing

Load combination 2:

P+S
A

s2 total

q: = =3.89ksf ⋅ ave2

footing

Load combination 3:

P+S
A

s3 total

q: = =3.54ksf ⋅

ave3

footing

The maximum soil pressure, q max , relative to each load combination can
be computed as follows:
Load combination 1:

1+ 6e
b

⋅ e

b

1
6

⋅

1 1

qif ≤ =2.8 ksf ⋅

ave1

q:=

4
31 2e
b

e
b

1
6

e
b

1
2

max1

1 1

⋅ qif ≥ ∧≤

ave1

1

⋅ −

Load combination 2:

6e
b

⋅

qif e
b

1
6

⋅

2 2

1 + ≤ =4.1 ksf ⋅

ave2

q: =

4
31 2e
b

qif e
b

1
6

e
b

1
2

max2

2 2

⋅ ≥ ∧≤

ave2

2

⋅ −