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RE: Footing design for uplift

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Jorge,

1997 UBC Section 1807.10 gives allowable procedure for determining the
friction resistance on an uncased cast-in-place concrete pile in soil.  With
a quick look, I didn't find the same provisions in the IBC.

Nels

Nels Roselund SE
Rosemead, CA


-----Original Message-----
From: Jimenez, Jorge A. [mailto:jajimenez(--nospam--at)csagroup.com] 
Sent: Friday, January 12, 2007 5:07 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Footing design for uplift

In the 'Structural Engineering Handbook', Gaylord & Gaylord, 3rd Edition
there are a discussion about this issue. The text gives a formula that
have the soil angle for internal friction and coefficient for lateral
pressure, among other variables.

Jorge Jimenez, PE

-----Original Message-----
From: Javier Encinas [mailto:jencinas(--nospam--at)asdipsoft.com] 
Sent: Thursday, January 11, 2007 9:17 PM
To: seaint(--nospam--at)seaint.org
Subject: Footing design for uplift

Sometimes in hurricane-prone zones the controling load in footing design
is
uplift. However, the text books are silent about methods to estimate the
selfweight to counteract the uplift force. In addition of the concrete
footing we have also the soil cover and the slab on grade. What angle of
the
cone is appropriate (45 degrees?), and what is the tributary area of the
slab that helps to keep the footing in place? Any good reference on the
subject, or full scale tests? Thanks in advance,

Javier Encinas, PE


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