Ok ok...I think I
may understand your query
I think you wanna know if
THIS (NB: the pier was sitting up on nuts in this photo but was eventually
bolted flat to the concrete footing) is any better or worse than
THIS...? (bearing in mind that I had the
same black steel pier bolted to the top of this monolithic pillar+footing too) aaand also
HERE and again, same black steel pier....an almost 20 year journey and 4 observatories
If so, then the (very scientific) answer, is... all were bloody rock steady
the last approach was probably the least stable and did show some very minor vibrations because I did not pour that pillar onto a wider, larger, heavier footing base but instead just continued the concrete pillar into the ground at the same diameter, with about 1m under ground and 1.3m above ground, so I suspect there
was perhaps just a little bit of a flag pole effect..?
Mike