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Re: Anchoring roof diaphragm to concrete wall

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Typically the wood connection governs, as you would think.  But review the Simpson tables for PA straps, which are commonly used as wall ties, and you will see the values limiting out at different levels for concrete and masonry.  For masonry, the values limit out on short straps, indicating the embedment strength is controlling, and for concrete the steel gage increases with longer straps and additional nailing indicating the steel tensile capacity reached a control point. 
With a potential 65% difference in required limiting capacity, it is not possible to simply assume the wood is the governing factor.
Paul Feather
----- Original Message -----
Sent: Wednesday, August 15, 2001 11:01 AM
Subject: RE: Anchoring roof diaphragm to concrete wall

I thought bolted wood connections fail by bearing or crushing of the wood. I interpret the 1.4 factor for steel to apply to the threaded rods in tension.