[Ferro List] subterranean - catenary strongest shape & tensile vs compressive forces

[chuck east]

-----Original Message-----
From: J Ganaposki [mailto:jetgraphics at charter.net] 
Sent: Tuesday, April 01, 2008 8:41 PM
To: chuck east
Subject: off FC topic

 

Hi -

Just throwing in another "thought" - have you looked into catenary 

curves for your underground shape? Or more accurately, inverted catenary .

 

http://en.wikipedia.org/wiki/Catenary

--------------------_______________________________________

Dear J Ganaposki, I thought I would reply within the fc discussion:

 

Thanks to your 'thought' I just reread an fc.net archive re 'Strongest
Shape/Pure Arc?' Date:2007-02-28
http://www.ferrocement.net/ferro/sql2/html1/msg2display.php?id=28253 and saw
what I had missed earlier which is that the combination of 'pointy catenary'
and 'circle' (something akin to 'curved barrel vault' or boat?) in a
subterranean structure apparently doesn't require a tensile ring for
reinforcement which, if accurate, to me says I can work with a pure LFC
method (= sans rebar) in the superstructure . also that would seem to
include the foundation.  I don't necessarily read this to include the
structural materials and design of the 'bulkheads'.

 

Chuck