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Tolerance on Strand position

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MHobbs

MHobbs

Structural
Sep 17, 2021
27
Anyone have a guidance on setting tolerance limits for wire position in precast members?
At the moment my instinct is to set a tolerance allowing for increased effective depth in the section but not a reduction from the designed value.
 
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In Australia it is typically 5 mm tolerance for the position of individual strands.

Precast suppliers will have accurate templates for laying out strands. I would count on the actual tolerance being pretty close to zero.
 
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Thanks for the reply I've been digging and the American precast/prestressed institute sets similar tolerances of 6mm (1/4 inch for them)
I'm UK based and I can't find any thing in writing but it seems the standard will be 5mm
 
 https://files.engineering.com/getfile.aspx?folder=3dd2f923-55e1-4cbd-a38f-beec7258c142&file=Tolerance-Manual.pdf
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