[Cob] shelves new member

[Shody Ryon]

Hi Everyone,
I am a new member comming from a CalEarth/cob hybread
perspective with lots of questions ... after I read
some more of the archive material

I couldn't open the shelf attachment (... or the glass
doors-is there something wrong with my computer?),
well I opened it but there were about 7 words and no
drawing

--- Marlin Nissen <marlin_nissen at yahoo.com> wrote:

> There could be an engineering calculation about
> spans
> and weight (force) in the middle of the span except
> cob varies so much.
> 
> It seems to me that you're asking about the shear
> strength of a "flat" cob shelf? Instead, if you were
> creating a bridge shape, which is an arch and
> distributes the weight to the outter walls.
>  (see attached drawing)
> 
> Otherwise you're exposing the cob to straight DOWN
> force which could expose a crack, likely near the
> center of the span. I've seen (in pix) sticks or
> bamboo shelf structures (horiz. girders) with cob
> over
> them that strengthens the span.....but why not try
> the
> arch? It doesn't have to be a full "Roman arch" even
> though that's the strongest but cuts away a lot of
> the
> space of the shelf below.
> 
> Cob with a good amount of long straw would (I'm
> guessing) be good for the strength of the shelf
> span.
> 
> A little arch will do ya,,,,
> 
> Marlin
> 
> p.s. great way to experiment with only books falling
> down.....
> 
> 
> 
> 
> --- Copper Harding <copperharding at yahoo.com> wrote:
> 
> > Ok.  So does anyone have any thoughts on the
> maximum
> > shelf length, width, extension that one could make
> > out
> > of cob?  Does anyone have any approximate formulas
> > for
> > extension and width versus thickness of the actual
> > shelf?  Has anyone managed to overload their shelf
> > with books and have it fall on their head?
> > 
> > Thanks,
> > 
> > Copper
> > 
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