timber / steel equivalents ??

[ratta]

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 :D

[bpj1968]

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

[me3_neuralfibre]

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

[pawnhead]

There's 'Capacity & Load Tables' for Unipiers here:
http://www.bluescopesteel.com.au/go/product/lysaght-uni-pier

I've used them before without having an engineers design, and it passed council inspection.