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7th December 2011, 08:47 PM #1Senior Member
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Timber frame engineering details in australia.
For some time I've been interested in large timber frame construction and I'm now ready to do the sums on my first small project except I can't find the design values for the timber I have around me.
Most of the info I have deals with oaks (european and american) and the american softwoods. I'm not fortunate enough to get enough oaks but in australia we do have access to large amounts of monterey pine and cypress. The thing is that all the tables I have don't seem to include these two species.
Now it is possible that southern pine or western pine may in clude P. radiata much like yair oak includes messmate and vic ash but none of the groupings seem even likely to include any cypress species.
I'll keep looking for more info but can anyone help?
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7th December 2011, 09:28 PM #2Hammer Head
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i think you find that the calc's are not applicable as our llading factors for wind, uplift, etc are not same as overseas.
you will also need to have the timber graded, to be used in a structer it can not be sawn from logs with out a certifeid grader giving the timber the big tick
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8th December 2011, 08:00 AM #3Senior Member
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The calculations will be relevant as I'm not working from span tables but from first principles. As you say things would be different over here, no snow loadings for example but for different safety factors, loadings, standards, etc. you just plug different numbers in to the formulas. However you can't do that until you get the base numbers for the timber you are using.
No point getting a grader to grade timbers until I've engineered the frame and can specify what grades different members need to be.
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9th December 2011, 02:03 PM #4
Have you tried google?
It through up www.timber.net.au - The Australian Database of Timber - Home with link to AS1684.2
F17 implies a working stress of 17MParegards from Alberta, Canada
ian
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11th December 2011, 07:17 AM #5Senior Member
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The americans have a stack of info that I need ( not for the cypress) I just cant seem to identify their timber groupings by species. In particular where does P. radiata fit into their timber classifications.
No one seems to have anything on C. Macrocarpa.
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11th December 2011, 05:03 PM #6
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12th December 2011, 06:11 AM #7Senior Member
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All sorts of stuff.
First project is a cider press cable of pressing out at least 100L of juice in a single pressing.
Then it will be a small shed to keep it in.
Followed by a series of trusses for a bigger shed that e will hopefully be building next year.
That will do for starters.
I now have basic details for monterey cypress, fb, horizontal shear and vertical shear.
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12th December 2011, 11:31 AM #8
Can I caution you against using timber property data sourced from the US.
Australian plantation grown pine is straighter and less knotty than native growth US wood.
For a small shed, Aus standard building practice should surfice -- ie no need for calcs
For trusses -- all bets are off as there's a whole lot of factors to be consideredregards from Alberta, Canada
ian
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13th December 2011, 08:20 PM #9Senior Member
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As far as I know there are no australian standards for large timber frame building without steel connections. If there are yes that would save a lot of time but as far as I know they have to be engineered from first principles.
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13th December 2011, 09:31 PM #10SENIOR MEMBER
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i think you'll find that the australian standards doesn't cover macrocarpa,so it can't be graded.but new zealand will give it an F4 rating but that doesn't stop people from using it to build homes here in oz,but if you google mudbrick at the duckpond you will find a house built from macrocarpa
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14th December 2011, 10:43 AM #11
If you're aiming to avoid using nails or bolts and instead intend to rely on pegged mortice & tenons and/or dovetails to hold things together, furniture design principles should guide you. ie the members will be much bigger than determined by the load, the critical issue being how much "meat" is left in the member after you cut the joint.
regards from Alberta, Canada
ian
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