Source? Because that seems counter intuitive.
Andy
Bending of a beam
Feb 10, 2016
22 Replies
It builds in some pre-stress.
No, it doesn't.
When you remove the support under the centre the beam will sag ever-so-slightly under its own weight, then more when it's loaded. If you want to pre-stress it you should load it before the cement is completely set.
That's why in pre-stressed concrete the reinforcing bars are put under tension.
Andy
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