TM 5-809-1/AFM 88-3, Chap. 15
Table 3-2. Minimum thickness of thickened floor slab for wall load near center of slab or near keyed or doweled joint
Thickness of
Slab Line Load Capacity, P, (lb/lin ft)
Flexural Strengtha of Concrete (lb/in2)
Thickened Floor
Slab, te, (inches)
550
600
650
700
4
425
455
485
510
5
565
600
640
675
6
710
755
805
850
7
860
920
975
1,030
8
1,015
1,080
1,150
1,215
9
1,175
1,255
1,330
1,410
10
1,340
1,430
1,520
1,605
NOTE: The allowable wall loads are based on a modulus of subgrade
reaction (k) of 100 pounds per cubic inch. The thickness of the
thickened slab will be computed by multiplying the above thick--
nesses by a constant factor. Constants for other subgrade moduli are
tabulated below.
Modulus of
25
50
100
200
300
Subgrade reaction k
Constant factor
1.3
1.1
1.0
0.9
0.8
For other modulus of subgrade reaction values the constant values
5
100/k.
may be found from
a
For this application the flexural strength of concrete was
)
assumed equal to 9 fc where f'c is the specified compressive
strength of concrete (lb/in2).
3-5
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