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Re: Column located on 4" existing concrete slab (Balcony vs Deck)

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The 60 psf live load reflects the propped cantilever condition (AISC Load
case 25) which some people do not design for.
By your logic, should a bathroom be designed for 62.4 psf?  Live loads have
been substantiated by working backwards from existing criteria - see ASCE-7.
I think this was recently discussed wrt "What does a posted live load really
mean?".  Anyway, with a propped cantilever, I feel 40 psf is fine.
----- Original Message -----
From: "Aswin Rangaswamy" <aswinpe(--nospam--at)hotmail.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, October 30, 2003 1:20 PM
Subject: Re: Column located on 4" existing concrete slab (Balcony vs Deck)


> Interpreting the code, you might be right but say 4 people are standing
> along the 14' side toward one post and they weigh about 200lb - the live
> load would then be 800lb?
>
> -  Aswin
> _________________________________
> Aswin Rangaswamy, P.E.
> Jacobs Facilities Inc. (www.jacobs.com )
> (714) 503-3772 (P); (714) 503-3865 (F)
>
>
> ----- Original Message -----
> From: "Jason Kilgore" <jkilgore(--nospam--at)leok.com>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Thursday, October 30, 2003 11:09 AM
> Subject: Re: Column located on 4" existing concrete slab
>
>
> > An exterior surface supported by two columns and a beam on one side and
> the
> > structure on the other is technicall clasified as a "deck", and the load
> > matches the load on the adjacent structure.
> >
> > A balcony is cantilevered without separate supports, and has higher
loads.
> >
> > ----
> > Jason Kilgore
> > Leigh & O'Kane, L.L.C.
> > jkilgore(--nospam--at)leok.com
> > 816-444-3144
> > 816-444-9655 (FAX)
> >
> > ----- Original Message -----
> > From: Aswin Rangaswamy
> > To: seaint(--nospam--at)seaint.org
> > Sent: Thursday, October 30, 2003 12:33 PM
> > Subject: Re: Column located on 4" existing concrete slab
> >
> >
> > Pl. check you loading again.  If using the UBC the LL on exterior
> balconies
> > is 60psf
> >
> > Trib. area on column = 14'/2 x 4'/2 = 14 SF
> >
> > LL = 60 psf x 14 SF = 840 LB
> >
> > Generally the slab poured outside are not properly compacted and
> reinforced.
> > I would caution against placing on the slab.  Base plate is a good idea.
> > Imagine kids (older ones) jumping up/down at the balcony!
> >
> > A cheaper alternative might be to use foundation blocks available at
Home
> > Depot.  Cut slab, dig hole, place foundation block, attach post to
block -
> > SIMPLE!
> >
> > -  Aswin
> > _________________________________
> > Aswin Rangaswamy, P.E.
> > Structural Engineer
> > Jacobs Facilities Inc. (www.jacobs.com )
> > (714) 503-3772 (P); (714) 503-3865 (F)
> >
> > ----- Original Message -----
> > From: ken kirkland
> > To: seaint(--nospam--at)seaint.org
> > Sent: Wednesday, October 29, 2003 4:37 PM
> > Subject: Column located on 4" existing concrete slab
> >
> >
> >
> > I have a balcony size 14'x4' supported by two column.  I estimate about
> 700#
> > D+L loads will transfer to 4x4 post.
> >
> > Can I place this column on top existing concrete about 4" thick?  If
not,
> > what is the correct procedure.
> >
> > TIA
> >
> >
> > Do you Yahoo!?
> > Exclusive Video Premiere - Britney Spears
> >
> >
> >
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