Limit State vs Permissible in temporary works
I’ve just designed a temporary timber hoarding using limit state and BS EN 1995 expecting a lolly pop at the end because I “did it thoroughly and correctly” only for the checker to be annoyed they now have to learn 1995 and they can’t use the TWf guides and our internal “cheat sheets”.
I naively thought the choice between design methods was between the stuck in the past engineer vs the modern engineer but I was very wrong. It seems that a lot of the stuff in temporary works is designed using permissible but not all of it.
Anyone have experience with having to chose between the two for temporary works?
I could have designed the hoarding in half the time and probably would have got the same design (maybe my ply would have been 2mm thicker). It’s a balance between design risk and efficiency which temporary works walks a fine line across.
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John Moran is going to love this post. This question goes right to the heart of the debate about what methods we are going to be using when we begin the re-write of ME Vol 2 PAM X.
Yes I’ve had this problem. Particularly with scaffolding where TG20:13 uses non-factored loads. As I understand this is because figures for scaffolding properties have safety factors included. However, you have to revert back to limit state for anchorages.