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wind load on this?
Hi all,
Just wondering if a single, thick wall, 76mm dia galv steel post would be sufficient for mounting 2 qty 610mmx2200mm aluminium signs (portrait) onto with 6 pieces of channel on the back of each? bottom of signs 1.2m from ground & 1m of post below ground in concrete.
Myles
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10 Replies
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Am I reading this correctly – 2 @ 2.2M high panels on one pole?
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Hi Neil,
Yes, that’s correct, one either side & not one above the other though 😮
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So – top is 3400mm out of ground, 610mm wide x 2200mm high.
1m in ground, concrete in (and use LOADS of it).
YES, the pole will be strong enough but it will flex and vibrate quite a lot in the wind.
Two poles better.
Dave
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quote Myles Brewer:Hi Neil,
Yes, that’s correct, one either side & not one above the other though 😮
😀 OK – I’d go along with what David says then.
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Thanks Dave / Neil, I wasn’t sure if at that width it would be necessary to have 2 posts, but best to be safe I guess.
Myles
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I suppose I have to say that if you use the following figures I will not accept any responsibility, however they might be a useful guide. An old friend of mine, an engineer involved in the design of building structures replied to the same question I asked of him a couple of years ago as below:-
Steve,
Its more complicated as you might guess, depending on location surface surroundings and life expectancy.
A good rule of thumb for general conditions would be 0.75kN/sq.m (15lbs/sq.ft in old money).
Hope this helps
Barry
Subject: Wind loading
Barry,
When you work out a figure for wind load /m² or ft² do you use a chart or is there a constant that can be multiplied by the wind speed? Or is it much more complicated than that?
Steve -
An in between would be to us an 89mm post?
Cheers
Gary
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If you’re registered with the Ashby website they have a wind loading calculator tool on the site.
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depends who you use as a supplier, I use to use Ashby for this sort of thing and would just tell them what size panels I required at what height above ground. They would calculate the post sizes required & number of runs of channel as they had the tables to do it.
If Peter says the tables are on their site though you may well be able to do it yourself.
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Thanks all for your input, I’ve registered with Ashby now & their calculator reckons 76mm is ok but I think I’d use 2 to be sure, being that it gets a might breezy here in the West of Ireland 😮
Myles
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