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).

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