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Re: IRC Braced Panels[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: IRC Braced Panels
- From: "Ted Ryan" <coffeemonkey100(--nospam--at)hotmail.com>
- Date: Sat, 8 Jan 2005 17:46:22 -0800
You are missing the intent of the IRC. It is not based on testing. The IRC is one big book of rule of thumbs that has worked for quite a while. Those rules are similar to the prescriptive design that was contained in the UBC, and have weathered near design level earthquake and wind events. No, you can't make the IRC pencil out. There are a hundred other variables that go into the actual force resisting system in a house that we don't consider in an engineered design, force transfer around windows and doors, friction between all the shear resisting elements, interior walls that are connected but not counted, and the list goes on. That is why I am comfortable with the IRC for mostly symmetric, two story or less wood framed houses.
No about the flexible versus rigid diaphragm question. It isn't a tiny speck, it is real. There has been testing and that testing suggests that we ought to rethink our concept of what a flexible diaphragm really is. Full scale tests have been performed that strongly indicate that a wood diaphragm can often distribute load like a rigid diaphragm would. This testing was not done on your IRC house however, they were houses with lots of irregularity, one that would not meet the IRC. Anywho, watch out for this rigid vs. flexible issue to come up in a code near you.
Lastly, the cutoff limit for me on holdown force is a force above which I could not physically resist myself. I figure that force to be 300# or so.
- IRC Braced Panels
- From: Ed Tornberg
- IRC Braced Panels
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