From: The Butterfly (salsbury_at_sculptors.com)
Date: 01/06/03
Date: Mon, 6 Jan 2003 21:36:11 -0800 From: The Butterfly <salsbury_at_sculptors.com> Message-Id: <200301070536.h075aBt01447@bootstrap.sculptors.com> Subject: Re: Structures Book
In article <002301c2b134$3c132aa0$39dececf_at_gateway> you write:
>
>I was surprised to learn that not all of the struts in a dome are in
>compression, some are actually in tension. Makes sense when you look
>at the diagrams, but I guess I believed the popular mistique that all
>parts of a shell type structure were in compression. Not so, although
>I'll bet some of you knew that already...
>
I seem to recall from somewhere (maybe "An Introduction to
Tensegrity?") that geodesic struts are really approaching the limit of
tensegrity struts where they all connect with one another. As such, the
visible tension network disappears and becomes a network of invisible
forces spread across the dome structure.
They way it was described, it sounded like *all* of the struts
were in tension outwards, radially, from the center. (Just as all
tensegrity struts are springing outwards along their various cables.)
I always pictured this as if the strut ends in a geodesic were 'tucked'
under one another, like building a tension structure with bamboo skewers
or somesuch.
>This is the kind of thing I'll be sure to have on the reference list
>in Domes for the Third Millenium. Maybe with the holiday travels
>slowing down I'll be able to get a wiki started for Simplicity Domes.
>
>Cheers Dan G.
>
I created a page for this in the Reality Sculptors Wiki back
on Dec. 12th. So far, no one has added to it. Please do.
http://reality.sculptors.com/cgi-bin/wiki?SimplicityDomes
Pat
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