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RE: pre-fabricated building

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There is a book Metal Building Systems – Design and Specifications by Alexander Newman shows a post tensioned  tendon detail with a note that says after stressing fill pocket with non-shrink grout.  The author recommends the tensioning rods be placed in the center of a grade beam.  The grade beam resists the compressive load. 


He does not recommend using a tie rod because it sags.


Gary W. Loomis, P.E., Senior Structural Engineering

Master Engineers and Designers, Inc.

-----Original Message-----
From: DomDean(--nospam--at) [mailto:DomDean(--nospam--at)]
: Monday, February 04, 2008 9:16 AM
To: seaint(--nospam--at)
Subject: Re: pre-fabricated building


I thought that with the length involved and rod sizes that there would be some significant sag. Would this be the case or am I worried about nothing?