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Foundations: a spread footing
An 8 ft square footing under an 18 in. column: soil bearing on service loads, concrete design on factored loads.
Transcript
Foundations: a spread footing.
Start
Footings, piles and retaining walls are under the Foundations tab of the wizard. Pick the spread footing.
The inputs
Here is a square footing, 8 feet by 8 feet, 20 inches thick, under an 18 inch concrete column. The service loads are 90 kips dead and 70 kips live, and the allowable soil pressure is 3 kips per square foot, gross, with 10 number 6 bars each way.
The results
The status bar reads Adequate, with soil bearing governing at 0.955. The footing and the soil above it weigh 23.4 kips, and the factored column load is 220 kips.
Bearing and concrete
Bearing is 2.87 kips per square foot, against 3. It uses service loads, with dead plus live. The concrete design uses factored loads. Open a row to see which is which, with the clause.
Your input
The allowable soil pressure is your geotechnical engineer's. The program takes the value you enter, and the clause says so.
Report and sheet
Then print the report, with every check, its equations and its clauses. Print the drawing sheet on your own title block, at the size you choose. Or export the same sheet as a DXF for your CAD software.
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