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I think it may have provided considerable support if the sag was jacked out of the beam before it was tensioned.
My buddy had some flimsy strait axels on his boat trailer, his old man told us to weld a short length of 1" angle in the bottom middle and run a 1/4" rod end to end welded in the middle and both ends.
no deflection after that.
 

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When I use to lenghten truck frames we would do something like that only with flat bar to make the frame stronger and not bend under a have load. Also pre stressed concrete bridge beams are make with the cable very tight then when done it causes the beams to bow.
 

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Not at all, there is much more tension needed to raise it up, overcoming the reverse bend then is needed to keep it from bending.
You have a point, was just thinking they're both working against the down force of gravity.
 
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