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RE: Garage Floor Design

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I think you should look at the second paragraph in section 1604.3...

"Parking garages for the storage of private or pleasure-type motor vehicles
with no repair or refueling shall have a floor system designed for a
concentrated load of not less than 2,000 pounds acting on an area of 20
square inches..."

I also think it is reasonable to consider where the point loads actually
occur.  It may be conservative to apply the point load at mid-span of the
joists.  You may want to look at where the wheel loads will actually occur
based on the garage door opeinings.  Of course this does not take into
account a resident jacking up their vehicle in the garage but that is a
pretty rare occuurence.

Regards...Henry David Kim

> -----Original Message-----
> From: GRileyPE(--nospam--at) [mailto:GRileyPE(--nospam--at)]
> Sent: Friday, November 20, 1998 6:35 PM
> To: seaint(--nospam--at)
> Subject: Re: Garage Floor Design
> Maybe there is something that I've been missing but getting away
> with. I've
> designed several hillside homes with elevated garage floor
> systems here in Los
> Angeles. The construction has been very similar to the one you've
> described.
> If I'm not mistaken, Section 1607.3.3 "Concentrated Loads" in the
> UBC, states
> "...placed upon any space 2 1/2 feet square,". This does not state 2 1/2
> square feet. I've always interpreted this to mean 2 1/2 feet x 2 1/2 feet
> which would distribute the 2000 pound point load over three joists and not
> two. This reduces the load to 667 pounds per joist. At this
> point, a uniform
> live load of 667 pounds/2.5 feet (266 pounds/foot) would be
> applied to that
> area of the joist. Using this methodology, the joists might calc-out.
> I would be interested in other engineers' takes on the subject.
> I've never had
> a problem getting a plan checker to buy into this, and I've never had a
> performance problem with any of the floors I've designed using this.
> Greg Riley PE