Re: Losses Due To Anchorage Slip-Prestressed Concrete!!
- From: Bob Morrison <bob@ _remove_rlmorrisonengr.com>
- Date: Mon, 14 Nov 2005 17:54:22 GMT
In a previous post wrote...
> In literature it is given that the losses due to anchorage slip (slip
> of the cable with respect to the anchorage, thereby reducing the given
> elongation in steel) occurs only in post tensioned members . But in
> pretensioned members also the tensile steel is stretched and anchored
> on the bulk heads(before pouring of concrete). Here too there can be a
> slip of the cable with respect to the anchorage.Right?
>
> Then why is it said losses due to anchorage slip occur only in post
> tensioned members??
>
Because there is no "anchor" per se in a prestressed member. You do get
losses in the prestress force (usually estimated at around 18%), but it is
due to elastic shortening of the concrete, rather than a "loss of grip"
between the anchor and the post tensioning cable or rod.
--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
.
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