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Column projection/Technical query

Mon Dec 28, 2015Total posts : 5
Pooja
Pooja
Join date: Dec 2015
Topic: Column projection/Technical query

Hi,

Here IRC refers to International residential code

I somewhere read as follows:
The IRC specifies that spread footings must be at least
6 inches thick and project at least 2 inches beyond the loaded
surface. In addition, the projection must not exceed the thickness.
So, if the pier is a 12-inch concrete column and the footing
is 24 inches in diameter and 6 inches thick, you’ve met
code. The footing projects 6 inches around the pier, exceeding
the minimum 2-inch projection, and just meeting the maximum
projection-to-thickness ratio.
You could also land a wooden column directly on a concrete footing. Let’s use a nominal 6x6. It measures 51/2 inches square, so the footing would project 91/4 inches beyond the 6x6. The projection exceeds the minimum 6-inch footing thickness, so to satisfy the IRC, this footing would have to be at least 91/4 inches thick. The reason is loads spread through a footing at 45 degrees in a cone shape (D). Concrete supported by the soil outside of this cone imposes a shear load on the footing, and such an unreinforced footing is likely to crack down the middle



If you understood and think that this is correct way, do you think that we all are following right technique?

To get full reading and helping understanding images, download attachment here

Attachments: Designing Pier Footings_tcm122-1377810.pdf on Mon Dec 28, 2015,&n
Mon Dec 28, 2015Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
         
             Thanks
 
Tue Dec 29, 2015Post  #2
Pooja
Pooja

Join date: Dec 2015
Post subject: Good topic

Sir,

Its really a good topic if you read it once
 
Tue Dec 29, 2015Post  #3
JAI PRAKASH
JAI PRAKASH

Join date: May 2014
Yes it is.

 
Fri Dec 18, 2020Post  #4
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Join date: Sep 2020
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