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RE: Difference between Initial Prestressing force and Jacking for ce

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Does anyone know WHEN the prestressing force can be applied by the contractor after the concrete was placed? 

 "Stuart, Matthew" <mStuart(--nospam--at)> wrote:

Jacking force is the overload placed on the strand so that when the force is released and the strand seats itself in the chuck (and you lose some force because of the resulting loss of elongation = to the seating slippage) you end up with the initial prestressing force before longterm losses.

D. Matthew Stuart, P.E., S.E., P.Eng.
Senior Project Manager
Schoor DePalma Engineers and Consultants
200 State Highway Nine
Manalapan, NJ 07726
732-577-9000 (Ext. 1275)
732 -431-9428 (Fax)

-----Original Message-----
From: Ellen [mailto:eguarin(--nospam--at)]
Sent: Thursday, March 13, 2003 9:14 PM
To: Seaint
Cc: Ronald R. Garcia
Subject: Difference between Initial Prestressing force and Jacking force


Just an additional question about prestress...

I want to know the difference between Initial Prestressing force and Jacking
What's the difference specifically?

Thanks in advance,

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