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RE: Footing design for uplift (yield line)

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Thanks Matthew

Can you recommend any references on yield line theory?

Regards
Steven CONRAD Harrison
B.Tech (mfg & mech), MIIE, gradTIEAust
mailto:sch.tectonic(--nospam--at)bigpond.com
Roy Harrison & Associates
Consulting Engineers (Structural)
PO Box 104
Para Hills
SA 5096
South Australia
tel: 8395 2177
fax: 8395 8477

-----Original Message-----
From: Stuart, Matthew [mailto:mstuart(--nospam--at)schoordepalma.com] 
Sent: Friday, 12 January 2007 22:57
To: seaint(--nospam--at)seaint.org
Subject: RE: Footing design for uplift

I use yield line theory to engage large portions of the slab on grade on
a regular basis to assist in my uplift calcs.  This approach is of great
benefit particularly on large open bay warehouse construction.

D. Matthew Stuart, P.E., S.E., F.ASCE, SECB
Senior Project Manager
Structural Department
Associate
Schoor DePalma Engineers and Consultants
200 State Highway Nine
Manalapan, NJ 07726
732-577-9000 (Ext. 1283)
908-309-8657 (Cell)
732-298-9441 (Fax)
mstuart(--nospam--at)schoordepalma.com


-----Original Message-----
From: Conrad Harrison [mailto:sch.tectonic(--nospam--at)bigpond.com] 
Sent: Thursday, January 11, 2007 11:14 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Footing design for uplift

The problem of the proportion of slab that can be activated to resist
uplift
seems similar to the problem of a bolt in an end plate. Can yield line
theory be used?

Regards
Steven CONRAD Harrison
B.Tech (mfg & mech), MIIE, gradTIEAust
mailto:sch.tectonic(--nospam--at)bigpond.com
Roy Harrison & Associates
Consulting Engineers (Structural)
PO Box 104
Para Hills
SA 5096
South Australia
tel: 8395 2177
fax: 8395 8477

-----Original Message-----
From: Michael Bryson [mailto:mbryson(--nospam--at)NYASE.com] 
Sent: Friday, 12 January 2007 14:05
To: seaint(--nospam--at)seaint.org
Subject: RE: Footing design for uplift

I usually assume a 45 degree cone including the soil and slab on grade.
I normally don't assume a tributary area of the slab on grade beyond the
45 degree cone but I suppose you could argue that the footing would not
move anywhere without taking a significant portion of a reinforced slab
on grade along with it.

I am not aware of any references on this subject.

Michael Bryson, SE


-----Original Message-----
From: Javier Encinas [mailto:jencinas(--nospam--at)asdipsoft.com] 
Sent: Thursday, January 11, 2007 5:17 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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