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Re: Furniture Live Load

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William Keil wrote:
> To confirm 40 psf as a design value:  Sum the total weight of the framing,
> people, mattress, linens, etc. and then divide by the area of a king size
> mattress.  For example 40 psf x 6' x 7' = 1680 pounds.  Average weight for
> two people = 2 x 200 = 400 pounds.  This appears to be a reasonable
> justification.
> William J. Keil, P.E.
> -----Original Message-----
> From: Rackmales, David N NAN02
> [mailto:David.N.Rackmales(--nospam--at)]
> Sent: Wednesday, July 28, 1999 8:55 AM
> To: 'seaint(--nospam--at)'
> Subject: RE: Furniture Live Load
> I'm interested in the loading ON the piece of furniture itself, not loadings
> on the floor as per my original message:
> >
> > Is there a resource listing Live Loads on furniture? That is, what's the
> > loading on a chair, a table, etc. I'm designing a loft bed using 40 psf
> for
> > the LL. Any suggestions?
> >
> The loft I mentioned will most likely be situated on a basement floor. The
> customer-specified geometry of the bed comprises two king-sized mattresses.
> In the absence of any specified codes for furniture design, I've used 40 psf
> to design the loft bed. The structure would be eight feet high and
> constructed of commercially-available (i.e., Home Depot, et al.) lumber.
> What I need to know is if 40 psf is too conservative a loading. Or is it not
> enough? Mr. Bart Needham earlier suggested an impact factor of two, which I
> can understand as jumping on the bed, falling on the bed, etc., etc. should
> be considered. For duration of load factor I used 1.0, though as the
> structure would be used for sleeping and would only come under use, what,
> eight hours a day?

** You might want to consider and compare what the load would be if someone de-
** cided they wanted a waterbed!  Don't forget the "Goldilocks" factor of safety:
** This Loft Bed is too Strong, This Loft Bed is too Weak, This Loft Bed is just
** right!!  (Suggest you design using LRFD (Loft Resistance Factored Design), a
** flexible diaphragm, and BWPs for the headboard.)

**PS: If someone were to die in bed with their boots on, don't forget the Dead Load. 
> The structure can safely be built with 2X8s, 2X4s, 4X4 columns (with lateral
> supports), plywood, etc. with the 40 psf LL. I am simply looking for a good
> resource to back up my assumptions; that is, does anyone know of a "timber
> furniture design handbook"?
> Thank you.
> > -----Original Message-----
> > From: Seaintonln(--nospam--at) [SMTP:Seaintonln(--nospam--at)]
> > Sent: Tuesday, July 27, 1999 20:49
> > To:   seaint(--nospam--at)
> > Subject:      Re: Furniture Live Load
> >
> > The live load developed by code considers furniture and any or all
> > non-permanent loads applied to a floor. Even a waterbed will not exceed
> > the
> > 40 psf live load requirment (considering 8 pounds per gallon, if you run
> > the
> > numbers the distribution is much less than 40 psf on most floors). By
> > comparion, furniture loads are very light unless you are trying to place
> > something like a vault or massive save in the center of a room.
> > The most serious problems associated with live loads from my experience is
> > in
> > office buildings where file cabinets are concentrated in the center of the
> >
> > floor spans and where the live loads can be easily overloaded depending on
> >
> > the capacity of the cabinet.
> >
> > I may not be answering your question - so, if you can be more specific
> > possibly we can help advise you.
> >
> > Dennis
> >