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PROBLEM 15.3
t
d
q
h
f’c3000psi fy60000psi
METHODOLOGY
1. Check soil bearing capacity including adjustment for
footing weight.
2. Check punching shear. This check often sets the
thickness of the footing.
3. Check slab shear.
4. Design flexural reinforcement.
5. Check bond and development length.
6. Check bearing stress under the column, especially if
the column concrete strength is
greater than the footing concrete strength.
7. Check temperature and minimum steel requirements
and sketch final design.
Step 1 Check soil bearing
footing.
b2
ft2
Problem 15.3 2/4
Develop the factored loads for the footing design.
Pu1.2 Pd
1.6 Pl
362 kip
ϕffy
da
2
ft
Problem 15.3 3/4
As6
The estimate for “a” could be refined, but as will be seen later, the refinement is not necessary at
this time.
Step 5 Check Bond and Development
fb
2t21496 psi Bearing stresses are OK.
Step 7 Check temperature and minimum reinforcement
Problem 15.3 4/4
10′-0″
27″
3″ clear, typ.
No. 6 (No. 19) @
10in. ea. way
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