[GSBN] Jumbo Question

[John Swearingen]

Sublime logic, Rub Tum....
Other John

On Fri, May 8, 2009 at 11:11 AM, RT <ArchiLogic at yahoo.ca> wrote:

> Hammer & Wolf writ:
>
>  At least in theory, it is the skins only that determine an SB wall's
>>> bearing
>>> capacity, because the plaster skins, not the bales, carry the load (as
>>> the
>>> stiffest element of the wall assembly).
>>>
>>
>  Not so in practice mate.  What happens is that the render creeps
>> downwards around 7mm over 2.7m high.
>>
>
> Clearly the answer to this pickle is that in Oz, where everything is
> upside-down, the roofs are holding up (or down, depending upon one's point
> of view) the walls.
>
> I've not seen the tests to which el Lupo refers, but 7mm sounds perfectly
> reasonable as an amount for drying shrinkage of a plaster panel that it 2700
> mm high.
>
> That that shrinkage appears as a gap between the top edge of the plaster
> and the roof bearing assembly also seems perfectly reasonable for an Oz
> building too, given that the live loads on and Oz roof would likely be
> non-existent and the dead loads would likely not exceed the compression
> resistance of the straw, especially if the bearing area provided by the
> straw is that of jumbo bales.
>
> OTOH, move those walls to someplace like Canada where buildings are, more
> often than not, multi-storey, with the floor and roof loads being carried by
> the walls and where the live loads are typically several times greater than
> the dead loads, it wouldn't be difficult to exceed the bearing capacity of
> the straw so that the skins take over.
>
>
> --
> === * ===
> Rob Tom
> Kanata, Ontario, Canada
> < A r c h i L o g i c  at  ChaffY a h o o  dot  C a >
> (manually winnow the chaff from my edress in your reply)
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-- 
John Swearingen

Skillful Means
www.skillful-means.com
blog: https://skillfulmeansdesign.wordpress.com
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