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Todd, Of course putting concrete inside a pipe will make it stronger, but not by as much as you might think. Concrete is strong in compression and has very little strength in tension. The pole is subjected to bending stress and thus has tension on one side and compression on the other. Even with concrete in the pipe, the tension stress is almost entirely carried by the steel. Failure by buckling occurs on the compression side of the pole so the concrete will help in that regard. But repeated loading to more than 50% of maximum can ultimately lead to fatigue failure (crack propagation) that may take many years to show up. Kent Osterberg Blue Mountain Solar [email protected] wrote:
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