# RE: Residential Garage (Help!)

• To: seaint(--nospam--at)seaint.org
• Subject: RE: Residential Garage (Help!)
• From: "J. K." <structure_r_us(--nospam--at)yahoo.com>
• Date: Wed, 27 Mar 2002 19:54:27 -0800 (PST)
```--- "Lutz, James" <JLUTZ(--nospam--at)earthtech.com> wrote:
> I think the code reads 20 inches square, or 20 x 20.
> That gives you an
> average bearing pressure on the loaded area of
> 2000lbs/4000 sq.in. = 50 psi,
> which is a typical high tire pressure for light
> vehicles.

!!!!!Watch out!!!!!
UBC contact area is 20 in^2, not 20"x20". Pressure
becomes 2000 lb/20 in^2 = 100 psi. It can not be 50
psi - you are not designing a roof rafer or a ceiling
joist.

It could be the shear that controls the design.

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