I've determined the N - stress relationship (relating the maximum stress the aluminium can take for a number of load cycles), but I don't know how many load cycles the aluminium should be designed to. Can anyone help? The design life is 20 years, and it's a 100kg sign that will cantilever off a wall (about 5m in the air) in the UK.
Perhaps this is something you determine in EN 1991-1-4 (wind loading to Eurocode)?
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