the angle to bend the ends of the steel struts

[AA]

1.  I see calculators for lengths of struts but what about the angle to end the ends? Ive heard 11 degrees before but no idea if that applies to that persons specific plan or not.

2.  There are about 4 most viewed videos on youtube for people making geodesic domes from steel pipe/conduit. Each of these videos show them flattening the ends and letting the angle happen naturally from the hydraulic press. Not once did I see them measure the angle, whats up with that?

[Ashok Mathur]

Geodesic domes get their strength by being self adjusting.

They are not true structures if you define a structure as a thing whose parts do not move relative to each other.

Geodesic domes are always vibrating about a mean and so unlike rigid structures they can self compensate.

This aspect of geodesic dome is not at all captured by FEA software and therefore it fails to forecast the correct strength of a dome.

Anyway about 11 degrees  roughly will do well for domes of your size.

Regards

Ashok 

Sent from my iPhone

On 04-Aug-2021, at 12:48 PM, AA <subway...@gmail.com> wrote:

1.  I see calculators for lengths of struts but what about the angle to end the ends? Ive heard 11 degrees before but no idea if that applies to that persons specific plan or not.

2.  There are about 4 most viewed videos on youtube for people making geodesic domes from steel pipe/conduit. Each of these videos show them flattening the ends and letting the angle happen naturally from the hydraulic press. Not once did I see them measure the angle, whats up with that?

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[AA]

ok great, thank you

[Gerry Toomey]

Here are drawings showing the bend angles of struts for 3 domes. The flattened ends of your steel struts should be bent as close as possible to these angles; otherwise you might have trouble inserting the bolt through the 5 or 6 strut-end holes at each vertex. Once the dome is up, further tightening the nuts should pull the whole dome together nicely.

- Gerry in Québec

[AA]

Thanks Gerry, very useful!