Quote:
Originally Posted by bojan
Guys..
What will be the load on that pier?
100kg max (mount + scope).
No side forces, no vibrations.. Floor is isolated so no transmission of vibration to Pier. No freezing of the ground during winter...
As I understand, there will be some sort of housing above (shed)? To prevent wind from affecting the structure during imaging (bars would not help against this anyway)
The only concern may be moving of the whole structure before is settles (after year or two).
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No side forces: not true, a GEM or fork mount almost certainly induces a bending moment on the pier. The OTA and counterweights are balanced on the mount of course, however that balance point is usually not over the center of the pier, especially at lower latitudes like in Australia. The fix for that is an offset plate, I used that in my dome but only because of the limited clearance of the CDK20 in the 3m dome.
No vibrations: rare, if the scope is looking at the sky the wind can shake it. Very high ROR walls can reduce it, but that makes the whole building somewhat over engineered (as opposed to just over engineering the pier). A dome can only keep the wind at bay up to 50% of the time!
Regards,
EB