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Old 02-26-2010, 12:52 PM   #16
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Round House Foundation Feasibility


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Yea, that sort of thing is doable, but then why was a flat disk with only outside supports proposed?
I believe the instructor proposed just using a slab because he thought that if it was made out of concrete then it would be enough without the bracing underneath. He really doesn't know too much about construction (neither do I), that's one reason he gave us this assignment, there is lots of research and changes to the original design.

If you were talking about the second design that I posted, it wasn't included mainly because I just did the slab for representation.

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Old 02-26-2010, 01:13 PM   #17
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Round House Foundation Feasibility


The block and beam system is often used for large spans in flooring.

http://www.cube6.co.uk
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Old 02-26-2010, 01:37 PM   #18
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Round House Foundation Feasibility


a lot of what you are doing requires a considerable amount of engineering with associated calculations. I am not qualified to do that nor would I do that here even if I were.

that is a lot of work to do your homework for you. You need to start researching the strength and load bearing capabilities of the building design and materials and soil as well as determining what the actual or proposed loads on any given point will be.

I do not know how in depth you are required to be in this but you would easily spend weeks on it, especially due to your lack of knowledge of the components being proposed.

have fun.
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Old 02-26-2010, 01:50 PM   #19
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Round House Foundation Feasibility


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Originally Posted by stuart45 View Post
The block and beam system is often used for large spans in flooring.

http://www.cube6.co.uk
Thank you for the link, I will take a closer look at it when I get a chance.
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Old 02-26-2010, 02:19 PM   #20
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Round House Foundation Feasibility


Plan B is certainly easier and less expensive to build than the bowl shaped foundation; plus as a water storage tank, it will have considerable more capacity, allowing the "full" level of the water to be held safely below the building floor, as there is a definate moisture migration issue to consider. I think that from a cost standpoint, a couple of interior columns would cut down $ appeciably. No doubt that a concrete floor could be engineered to carry this span, but from feasibility view, it would be more expensive. Also , plan B could be built with a typical pile supported slab on grade design, with integral grade beams; whereas the bowl would require much more excavation and engineering design to pour a central pier to some required depth for support, as it's bowl shape is transferring all the building structure and the contained water to a central point.
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Old 02-26-2010, 02:27 PM   #21
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Round House Foundation Feasibility


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He really doesn't know too much about construction (neither do I),
Ayuh,... Sounds like some Engineers I know....
They know what you need, just No idea of How to get there....
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Old 02-26-2010, 03:20 PM   #22
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Round House Foundation Feasibility


Based on Plan B-

1. Build the foundation slab with dowels exposed.

2. Building the lower concrete foundation walls with vertical rebar lapped to the dowels. Horizontal rebars sized and spaced by the engineer. Project rebars/dowels out of the lower foundation wall.

3. Form the circular flat slab with an opening for access. The slab should be a 2-way slab tied to the lower foundations for greater strength and stability. The opening could be used to get the forming materials out, similat to removing forms from some box beam bridges. If the lower area needs an opening for casual access, it could serve both purposes and could be located to fit the desired use of the upper floor plan. Many times stonger than a wood floor system and also thinner. - Precast is out of the question because of the size, shipping, and placement since a large crane would be required and there is no economy for precast for a one or two of a kind. Since there will be an 8' deep pool below. the engineer could require a steel post in the center if the access hole is too large. Wood for the "disc" floor probably would not be acceptable because of humidity, moisture and deterioration/mold.

The upper portion could be built out of wood, masonry, poured concrete of CIFs.

This is for feasibility only and the details will have to be determined by an engineer depending on the use and the loads imposed by the upper portion of the structure.

Dick

Last edited by concretemasonry; 02-26-2010 at 03:29 PM.
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Old 02-26-2010, 03:52 PM   #23
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Round House Foundation Feasibility


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Why are you trying to reinvent the wheel?

See the picture of a water tank under construction.
a lot of native american dwellings were circular buildings. head down to your library and read up some of the societies in central and south american did and still do make buildings that are oval or circular that easily span 60' or more. to be fair - they aren't made of concrete, but the technology to make a circular building is pretty old. it would probably help your argument also to have some historical precedent.
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Old 02-27-2010, 09:34 AM   #24
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Round House Foundation Feasibility


using insulated conc forms'll make your job MUCH easier im-n-s-h-f might consider just having an underground cistern cast-in-place,,, the economics're much better - again, jmo !

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