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Pretensioning Of Anchor Bolts

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     The Commentary to the LRFD Specification Section A4.3 indicates that 
     "The designer should be aware that pretensioning anchor bolts is not 
     recommended due to relaxation and stress corrosion after 
     pretensioning."
     
     Does anybody have any background or references regarding this 
     recommendation.
     
     Thanx,
     
     Rick Drake, SE
     Fluor Daniel, Irvine