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this post was submitted on 12 Mar 2024
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Asklemmy
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Structural engineer, and it depends. If I am doing structural or quantity calculations, I can get away with 3.14 (3 digits).
If I'm dealing with survey coordinates defined by horizontal curves, I'll have to use at least 10 digits.
So do I have this right - if you think about the building being structurally sound you can get away with more error than if checking whether you're accidentaly on the neighbour's plot of land?
Not a civil engineer, but an engineer here, if you're doing structural soundness, you usually apply a generous margin of error, so it doesn't have to be that tight, you're building it 3 times as strong as needed anyway.
While if you're calculating where your plot is, you don't want to leave a few meters empty or go past a few meters "just to be sure".
Yes.
There isn't that much benefit to knowing if something is 4.5672% overstressed compared to being 5% overstressed. There are also some cases where the method of calculating demand or capacity isn't that precise; the design code will show the simple equation but have a more complicated equation that better models what is happening in the commentary.
In contrast, some surveying is dealing in a state's coordinate plane. This can be very precise, with some measurements provided down to the 1/10000 of a foot to keep error down when they measure it in the field. In that case, you need to be more precise.