Stiffness of round bar

Cleaning out the "drafts" folder, Don?

That was a failed exercise in explaining. I also meant post-tensioned, not pre-tensioned, but it doesn't matter. It applies to any kind of tensioning.

The concrete itself it never in tension. The tension members in post-tensioned concrete are separate from the concrete itself. Is that better?

Wise guy. d8-)

Imagination. Years ago, I as making a machine to take an SRIM dispensing head into a press. The head was pretty darn heavy and the beam was fairly long.

My little brain knew that droop was going to be an issue. Glory be, machinist handbook has the formulas to calculate that for regular sections.

Now not trusting my interpretation of the material presented, I performed the calculations for various items in our stock rack and damn, when I clamped the stock to a heavy support to check, the calculations proved out.

I ended up with a rectangular tube that was made out of two pieces of aluminum L section angle together by my brother in law to get what I wanted based on the calculations.

Wes

-- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller