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bolt pre-tensioning

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In order for bolt, rebar or pt-tendon resist ultimate load (Mu, Pu or
Vu) it has to experience stress (or deformation)
 ranging from  fs to fs=fy (or fp) and it does not matter if fs was
equal to 0 or 0.7xAbxFb when the structure is at ultimate state
 as long as it produces force iqual to ARIAxULTIMATE STRESSxFACTOR

But the force(deformation) range does affect the fatigue, so that by
reducing it (range) performance of the structure can be improved.

Pavel Kravets
Heery International