#11  
Old 09-09-2009, 07:10 PM
jmhepworth's Avatar
Journeyman
 
Join Date: Feb 2008
Location: Kaysville, Utah
Posts: 291
Default Re: Stepped dome?

Hey, I'm a dumb, middle aged lawyer who makes my living on my butt, and mine turned out nice (at least the neighbors are all impressed). It was fun to build. If I can do it, anyone can.

Joe
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  #12  
Old 09-09-2009, 11:03 PM
Master Builder
 
Join Date: Jul 2009
Location: Los Angeles
Posts: 942
Default Re: Stepped dome?

Someone posted a video of a stepped dome with faced interior here:

http://www.fornobravo.com/forum/f41/...html#post64160 (Interesting way to get a dome shape...)
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  #13  
Old 09-10-2009, 03:37 AM
Il Pizzaiolo
 
Join Date: Mar 2009
Location: USA
Posts: 1,436
Default Re: Stepped dome?

looks like a lotttt of cutting, but it does look good
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  #14  
Old 09-10-2009, 07:56 AM
Master Builder
 
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Location: Los Angeles
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Default Re: Stepped dome?

Quote:
Originally Posted by ThisOldGarageNJ View Post
looks like a lotttt of cutting, but it does look good
I agree. Also seems like more work.
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  #15  
Old 09-10-2009, 09:17 PM
kebwi's Avatar
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Join Date: Aug 2009
Location: Seattle, WA, USA
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Default Re: Stepped dome?

Stepped arches are also called corbel arches. Without dwelling on this too much, the bottom line is, corbel arches are much weaker than keystoned catenary arches (or pseudo catenaries contained within elliptical arches or even of segmental arches consisting of catenary or pseudo-catenary-elliptical design). Corbels are at the bottom of the pile. Heh heh.

A little google searching (and wikipedia reading) should explain why.

Take that as you may.

Cheers!
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  #16  
Old 09-11-2009, 05:26 PM
Neil2's Avatar
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Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Stepped dome?

What you will get is a corbled arch (dome).

This is not as structurally sound as compression arch (with keystone). Repeated heating and cooling cycles will further weaken it as the bricks creep back and forth. In a normal dome heating and cooling cycles are not a problem since the bricks cannot move "sideways" out of compression.

I would think twice about using this type of construction.

There is a very good reason why history has given us the compression dome.
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