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RE: Re-entrant Corner Question[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Re-entrant Corner Question
- From: "Dennis Wish" <dennis.wish(--nospam--at)verizon.net>
- Date: Fri, 11 Jul 2008 19:20:30 -0700
Thanks Scott – this answers a question that has been troubling me for a while now. I am sorry not to have responded sooner – a death in the family has had me occupied most of the week as I tried to help my second cousin in Wisconsin arrange the funeral preparations from California (could not afford to fly back but expected the passing of my cousin who was 85 years old). I am just starting to get caught up and wanted to work on Multi-Lat™ and this issue related to plan irregularity needs to be considered for how the use of Omega (Overstrength Factor) and with Rho (Redundancy factor) is to be considered.
I would say that you care about the re-entrant corners of the diaphragms. If it is a one story building and the roof is rectangular even thought the outline of the buidling is L shaped or U shaped, then I would not consider it a plan irregularity typically. If it is a multiple story building and the only the roof is rectangular (thus "regular") but other floors (thus diaphragms) at other levels are U shaped or L shaped (i.e. irregular), then you have a plan irregularity potentially. It will also depend on if you have flexible diaphragms or not...and where the shearwalls are relative to the whole system. I would argue that a U shaped building with a bunch of flexible diaphragms with appropriate shearwalls at the edges of the simple, flexible diaphragm might result in you realistically having a bunch of simple, rectangular flexible diaphragm segements which could result in the ability to treat it as a regular building. To me, it is REALLY a matter of the specifics of the particular situation.
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