[Cob] cob with buttresses , Vaulted rafters???

[Bill&Julie]

Hello,,,  With Vaulted Rafters, you have the weight of the roof trying
to push the top of the walls out. And that is why the Buttressed walls
were built, to hold the walls up and give the energy another path to the
ground.

With The Pantheon ,, unless I really missed something,,  Buttresses were
not needed because the way the roofs were built, they did not push out
at the eves...

Also another way to look at Buttresses, is that they make a " corner "
on the wall. The corner is on the outside of the building. But if you
 look at the way buildings collapse, whether blown down by wind or
bombs or shook down by earth quakes. The corners are the last to go.
This is because the corner changes the direction of the force. What
is pushing on the flat of one wall is now pushing on the edge of the
other wall,, What was a bending of the one wall,, is now the
compression of the other... Or the energy is going inside the wall
through the length of the wall...

Yet another way to look at things,,,  and 2¢ bill


----- Original Message ----- 
From: <tms at northcoast.com>
To: "Amanda Peck" <ap615 at hotmail.com>
Cc: <coblist at deatech.com>
Sent: Saturday, February 21, 2004 1:26 PM
Subject: Re: [Cob] cob with buttresses


> >
> > So, in building with anything--cob, bales, steel, wood, concrete, stone
(I
> > remember reading about the invention of flying buttresses as a great
> > innovation)--we need to try to destress our building.
>
> +++++++++++++
>
> Actually I believe  the flying butress was a desperate solution to
> supporting a large wall to remove stresses.
>  Mostly for those big churches in Europe.
>
> While I love them and the ones on the Notre Dame are gorgeous they came
> about after the technique
> of building was lost during the dark ages. The Pantheon built by the
> Romans is still a marvel,
> and the ability to make large spans was lost for 1,000 years, hence the
> buttresses  solution.
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