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1997 UBC Section 1633.2.9.3
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- Subject: 1997 UBC Section 1633.2.9.3
- From: "Bill Allen" <Bill(--nospam--at)AllenDesigns.com>
- Date: Thu, 7 Oct 1999 15:42:12 -0700
This section of the Code limits the R value for wood diaphragm design supporting walls or frames of concrete or masonry to 4. What a PITA. Of course, a similar section existed in the 1994 UBC (Section 1631.2.9.3). The difference? In the 1994 UBC the restriction was an Rw value of 6 which is the design value for the building. Since the R value limitation of 4 is different than the design value for the building (4.5). So, now, we have to calculate diaphragm values twice. What a ridiculous exercise this is. If we take an Rw value of 6 and divide by the load factor of 1.4, I get an R value of 4.3. Why oh why couldn't this be 4.5 in the Code? Sheesh. Bill Allen, S.E. ALLEN DESIGNS Laguna Niguel, CA
- References:
- Computer model with tension only bracing
- From: Roger Turk
- Computer model with tension only bracing
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