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Thread: timber / steel equivalents ??
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23rd September 2007, 01:15 PM #1
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timber / steel equivalents ??
I am currently designing my first deck which will be all timber expect for the posts. I have info on timber posts, but not steel.
It is a second storey deck. I am unable to find any info on what size and wall thickness posts ,(duragal) , I will be required to use and wondered if the is any information out there for this. Also I require info on footings, as I want to bolt the posts onto the footings using base plates.
Currently the information I am using is Allan Staines - Decks & pergolas and Timber Qld - Residential Timber Decks
The deck will be 3.4 x 3.4 attached to house on second level.
Any info will be greatly appreciated. thanks Matt
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23rd September 2007, 02:31 PM #2
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As an idea for you I had a second story deck as follows. 3 posts at approx 3.2 metres height. each supported the end of a 6 metre steel bearer. The other ends were attached to steel beams that were originally cantilevered from the house. the posts wer 3.2 and 3.6 metres apart. i.e. deck of 6 x 6.8 metres An extra steel beam ran across the front of the 3 posts at the same height as the bearer. All this was specified by an engineer as follows
- The posts were 100 x 100 x 3.0 mm wall thickness. Grade 350 (whatever that meant)
- He specified 300 x 300 x 12 mm base plates. using 4 16x150 mm chemsets.
- Footings were 500 x 500 x 500.
These are of his specs I submitted to council.
I wanted to embed the posts directly in, which he was more than happy with for the same specs.
I can't be 100% but I think in the initial stages he said 75 x 75 x 3.0 mm was ample for the posts, but I think we went with 100 x 100 as it looked better asthetically (I hope that is how it is spelt)
Usual disclaimer of - That is what my engineer specified for my circumstances, and it may not be applicable to you
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25th September 2007, 10:10 AM #3
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Technically there are no span tables for steel as all steel structures have to be engineered. There are however some span tables for RHS on the BHP website under Duragal. I have a copy here if you can't find them. me3 at neuralfibre dot com
Paul
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25th September 2007, 11:08 AM #4
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There's 'Capacity & Load Tables' for Unipiers here:
http://www.bluescopesteel.com.au/go/...saght-uni-pier
I've used them before without having an engineers design, and it passed council inspection.
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