5-axle trucks

50

I

4 axles, 5 kips each

1 axle, 10 kips

15-kip forklift or trucks

15

II

Stationary Live Load

1,200 pounds per square inch

Interior Wall Load

1,400 pounds per linear foot

Concrete flexural strength = 650 pounds per square inch

Modulus of subgrade reaction, k = 150 pounds per cubic inch

(1) Floor slab thicknesses h should be determined by using equivalent forklift truck axle load

below.

5

4

50

200

4

10

1

50

50

4

15

1

15

15

7

Matching the axle loads and maximum operations per day in table 5-1, the design index for each axle-load

group is selected as shown in the far right column in the above-mentioned table. Design index 7 is selected

for the design. From figure 5-1, usingk = 150 pounds per cubic inch and 650 pounds per square inch flexural

strength, slab thickness equal to 6.7 inches, and round to 7 inches should be selected.

(2) One must check for adequacy of 7 inch slab for stationary live load, w = 1 200 pounds per

square foot. Table 3-1 should be entered using 650 pounds per square inch flexural strength concrete and 7

inch slab thickness; allowable stationary live load is selected, w =1,109 pounds per square inch. The w is

adjusted based on k = 150 pounds per cubic inch.

150

' 1,358lb/ft 2 > 1,200lb/ft 2

w ' 1,109

100

(3) Thickness, tc, of thickened floor slab supporting interior wall weighing 1,400 pounds per linear

foot should be determined by entering table 3-2 using 650 pounds per square inch flexural strength concrete

and wall load p = 1,400 pounds per linear foot. Thus, tc equals 10 inches, and tc is adjusted based on k = 150

pounds per square inch.

C-1

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