[bojan]

Practically, in those arguments I do not see the concrete numbers for specific case, only formulas - which are of course just indication of what is better and what is worse..

So, bigger diameter is better than smaller one (that is not a surprise for me)..

But what would be good to see are some absolute numbers, not comparisons: what kind of flexure (in arcsec) we have at a specific case, for example: 16cm dia concrete pier, 1 meter high, with 10N force applied to the side.
Otherwise some people will always think that their pier is not *quite* rigid enough.. and most likely it is already 10x overkill.

I will try to talk to a friend who is civil engineer, and I will give you guys some specific numbers when I get them.