DESIGN OF SLABS-ON-GROUND 360R-63
APPENDIX 2—SLAB THICKNESS DESIGN
BY WRI METHOD
A2.1—Introduction
The following two examples show the determination of
thickness for a slab-on-ground based on an unreinforced
slab. A nominal quantity of distributed
reinforcement can be
placed in the upper 1/3 of the slab. The primary purpose of this
reinforcement is to limit the width of any cracks (if they
occur) that may form between the joints. The following
examples are presented in inch-pound units.
A table for
converting the examples to SI units, along with an example of
the process, is provided at the end of the Appendixes.
The design charts are for a single
axle loading with two
single wheels and for the controlling moment in an aisle with
uniform loading on either side. The first situation is
controlled by tension
on the bottom of the slab, and the
second is controlled by tension on the top of the slab. Both
procedures start with use of a relative stiffness term
D/
k, and
require the initial assumption
of the concrete modulus of
elasticity
E and slab thickness
H, as well as selected the allow-
able tensile unit stress and the appropriate
subgrade modulus k.
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