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RE: Re-entrant Corner Question
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Re-entrant Corner Question
- From: "Bill Allen" <T.W.Allen(--nospam--at)cox.net>
- Date: Mon, 7 Jul 2008 06:45:28 -0700
Mark your calendars, ladies and gentlemen.
On this day, Bill Allen agrees with Scott Maxwell.
T. William (Bill)
V (949) 248-8588 •
From: Scott Maxwell
Sent: Sunday, July 06, 2008 6:47
Subject: RE: Re-entrant Corner
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
From: Dennis Wish
Sent: Sunday, July 06, 2008 6:04
Subject: Re-entrant Corner
determining a plan irregularity such as a re-entrant corner do you judge the
irregularity by the geometry of the resisting walls or by the geometry of the
roof? For example, if you have a “U” shaped structure with a
rectangular roof that covers the entire lower floor, do you define the
irregularity from the roof shape of walls in plan? If the roof is square or
rectangular in plan over a building that is “U” shaped then what
difference does it make if the courtyard entry to the building is set back so
long as the roof does not lend itself to rotation. Hope this makes some sense.
let me know if you have any questions to answer this properly. TIA!
Dennis S. Wish, PE
S. Wish, PE