TM 5-818-1 / AFM 88-3, Chap. 7
c. Foundation stresses caused by applied
stress versus depth, using average unit moist weights of
soil above the water table and average unit submerged
loads are generally computed assuming the foundation
weights below the water table.
to consist of an elastic, isotropic, homogeneous mass of
b. The final stress p at any depth is equal to
semiinfinite extent, i.e., the Boussinesq case. The
the effective overburden stress after the structure is
increment of stress at various depths is determined by
completed plus the stress resulting from the structure
means of influence values, such as shown in figures 5-1
load. If the structure is founded on individual footings,
and 5-2, which give the vertical stress beneath a
the final stress is the sum of stresses imposed by all
rectangular area for uniform and triangular distributions
footings.
of load, respectively. Influence values for vertical
Allowable
δ/ϑ
Type of Building
L/H
Steel frame with flexible siding
--
0.008
Steel or reinforced concrete frame
--
0.002 to
with insensitive finish such as
0.003
dry wall, glass, or moveable
panels
Steel or reinforced concrete frame
>5
0.002
with brick, block, plaster, or
stucco finish
<3
0.001
Load-bearing brick, tile, or
>5
0.0008
concrete block walls
<3
0.0004
Circular steel tanks on flexible
--
0.008
base, with fixed top
Circular steel tanks on flexible
0.002 to
base, with floating top
0.003
Tall slender structures, such as
--
0.002
stacks, silos, and water tanks,
with rigid mat foundations
U. S. Army Corps of Engineers
5-3
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