Civil Engineering Reference
In-Depth Information
F
i g u r e
13.6 Rigid versus lexible foundation effects.
Rigid foundation (bending is not influenced as much by
K
s
):
π
L
<
4
λ
Flexible foundation (bending heavily localized):
L
>
λπ
LK
EI
4
′
λ
L
=
4
s
4
where
K
′
S
=
K
S
B
B
= footing width, ft
L
= footing length, ft
K
s
= MSR = modulus of subgrade reaction, pcf, kcf
E
= modulus of elasticity of concrete section, psi, ksi
I
= moment of inertia of concrete section, in
4
, ft
4
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