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Re: Glulam Roof Girders in a Tilt-Up

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Gerard,
 
Buy a Simpson strap and some nails and compare the hole sizes with the sizes of the recommended nails -- the nails will be loose in the holes.  The strap will carry no load until the nails are bearing tightly against the edges of the holes.  It is probable that initially, very few nails will be effectively located to transfer load from the wood beam to the strap.  Next compare AE of the straps with AE of the portion of the beam you want to reinforce.  Even if the tension load could be effectively shared with the strap, the strap's share would be minimal.
 
Bill's approach using post-tensioning, with or without Bob Powell, seems to be the right way to go.
 
Nels Roselund
Structural Engineer
South San Gabriel, CA
njineer(--nospam--at)att.net