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Your steel metal building
or barn will need a good slab to sit on. And the slab will need to
be reinforced.
There are three primary
purposes for reinforcing slabs-on-grade and they are:
Shrinkage Control
Shrinkage control is the greatest design concern with
slabs-on-grade. Steel reinforcing along with joint spacing offer two
primary elements that can be effective in controlling shrinkage
cracks. The most common mistake among designers and engineers is not
providing enough of steel reinforcing for a slab-on-grade.
Temperature Control
Concrete is brittle — it is very susceptible to additional cracking
and fracturing by dramatic changes in weather. The change in
temperature is commonly referred to as Temperature Gradient. Steel
reinforcing offers the best assistance because it essentially has
the same coefficient of thermal expansion, thereby expanding and
contracting at the same rate as the concrete.
Moment Capacity
Slabs-on-grade design procedures usually provide a designer with the
slab thickness. The thickness of the slab is a function of loading,
subgrade, modulus of rupture for concrete, and slab stiffness.
As you can there are three primary design considerations for a every
foundation:
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