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Todd,<br>
<br>
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.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:toddcory@finestplanet.com">toddcory@finestplanet.com</a> wrote:
<blockquote cite="mid:1311706198.626528938@webmail.finestplanet.com"
type="cite"><font face="arial" size="4">
<p>Wrenches,</p>
<p> </p>
<p>Fact or fiction: Adding concrete to the inside of a pole mount
pipe makes it stronger.</p>
<p> </p>
<p>Thanks,</p>
<p> </p>
<p>Todd</p>
</font><br>
<br>
<br>
Sent from Finest Planet WebMail.<br>
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