AECT250-Lecture 36

AECT250-Lecture 36 - Lecture 36 Column Footings All columns...

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Lecture 36 - Page 1 of 8 Lecture 36 – Column Footings All columns must bear on footings. Usually these footings are square or circular for ease of design and formwork. The same general requirements and design fundamentals pertain to column footings as for wall footings, i.e., Column Footing Requirements : 1) Must distribute the loads evenly to the soil. 2) Bottom of footing must be deeper than the frost penetration or else frost heave will occur. 3) Must be well-drained to prevent wash-out. 4) Must bear on undisturbed (or engineered) soil. A typical column footing is shown below:
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Lecture 36 - Page 2 of 8 Example GIVEN : A steel column rests on a 12” x 12” base plate and has the following: P DEAD = 120 KIPS (Service Load) P LIVE = 100 KIPS (Service Load) Concrete f’ c = 3000 PSI Depth to frost = 4’-0” Allowable soil bearing = q a = 4000 PSF Soil unit weight = 100 PCF Use #7 grade 60 bars for all bars Concrete cover = 3” per ACI REQUIRED : Design the square concrete footing, including all dimensions and bars. Provide a “Summary Sketch” showing all information necessary to build it. Step 1 – Determine “Trial” footing thickness
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AECT250-Lecture 36 - Lecture 36 Column Footings All columns...

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