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Old 06-10-2010, 09:50 AM
GianniFocaccia's Avatar
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Default Re: two ?s - door shape and chimney opening

Keith,

Thanks for pointing out the loaded catenary properties. It's interesting to note that if the inverted catenary arch is loaded only where the approximate vent and chimney reside (the middle 50%), the effect to the arch is to pull the sides into a more vertical position.

Depending on the mass of any given vent transition/chimney, I agree that the entry arches with truly vertical sides shouldn't have a stability concern. However, builds are shown with additional entryway bricks that effectively 'increase the width of the pier.' This additional mass in the entryway would presumably wick heat from the oven, and since it is not insulated on the inside, lose that stored heat over time even though the door is on.

According to the Auroville Earth Institute data 'Catenary arches are always the most stable so their thickness can be reduced'. Maybe this is another reason to consider a catenary (hemispherical) entryway.

Last edited by GianniFocaccia; 06-10-2010 at 09:54 AM.
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