freewill on sat 31 jan 98
If neither catenary nor "sprung" arch kilns need metal reinforcement,
could someone tell me what the difference would be, between these two
types?
I thought I understood, but now I'm confused again. :)
Thanks in advance...
jenni
in Omaha, where my calendar's definitely broken. It's January, right? Why
is it 50 degrees out there?
Grimmer on sun 1 feb 98
Jenni,
A sprung arch is described by the arc of a circle. It has a span,
which is the distance it 'arches over,' and a rise, which is the height
of the arch (not the whole kiln) at its center. It also has a radius
and an included angle, which define the curve of the arch. A barrel
arch is a sprung arch of 180 degrees. A half circle.
A catenary is described by a chain or heavy, limp, cord hanging
between two points. The span is the distance between the points,
and the rise is the length the chain hangs down. Turn it upside
down, and you have your arch. Think of the Gateway Arch in St.
Louis.
Hope that was clear.
steve grimmer
marion illinois
freewill wrote:
>
> ----------------------------Original message----------------------------
>
> If neither catenary nor "sprung" arch kilns need metal reinforcement,
> could someone tell me what the difference would be, between these two
> types?
>
> I thought I understood, but now I'm confused again. :)
>
> Thanks in advance...
>
> jenni
>
> in Omaha, where my calendar's definitely broken. It's January, right? Why
> is it 50 degrees out there?
Vince Pitelka on sun 1 feb 98
At 10:34 AM 1/31/98 -0500, you wrote:
>----------------------------Original message----------------------------
>
>If neither catenary nor "sprung" arch kilns need metal reinforcement,
>could someone tell me what the difference would be, between these two
>types?
A sprung arch ALWAYS needs external buttressing, metal or otherwise. As
Ellen said, a catenary arch transmits ALL of its thrust to ground level, and
needs no butressing. But a sprung arch, by its very nature, transmits most
of it's load outwards, and needs sturdy butressing. A Roman arch, which is
a semicircle, transports more load downwards, but still needs buttressing,
as you can see in all examples of Roman architecture.
- Vince
Vince Pitelka - vpitelka@DeKalb.net
Home 615/597-5376, work 615/597-6801, fax 615/597-6803
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
paul wilmoth on mon 2 feb 98
Jenni,
Catenary arches don't need metal supports but sprung arches do!
If someone told you otherwise they are misinformed!
_Paul
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