Disclaimer - EE speaking about strength of materials
Regarding WA7BNM's observation on filling pipes with concrete:
I believe that the 35% increase in strength for filling a pipe with
concrete is due to the concrete stabilizing the shape of the pipe and
preventing it from buckling. Unreinforced concrete has poor resistance to
bending, but resists non-bending compression fairly well. Think of the
pipe as "external rebar" to the composite steel/concrete structure. The
concrete also serves to damp vibration, but that doesn't really affect
this application.
73, Ward N0AX
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