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RE: Re-entrant Corner Question

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Hi Dennis;

            Yep!  I’m with Scott.  J



Terry Weatherby


Engineering and Design

Jackson, CA 95642


From: Scott Maxwell [mailto:smaxwell(--nospam--at)]
Sent: Sunday, July 06, 2008 6:47 PM
To: seaint(--nospam--at)
Subject: RE: Re-entrant Corner Question


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.





Adrian, MI

-----Original Message-----
From: Dennis Wish [mailto:dennis.wish(--nospam--at)]
Sent: Sunday, July 06, 2008 6:04 PM
To: seaint(--nospam--at)
Subject: Re-entrant Corner Question

When 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.


Please let me know if you have any questions to answer this properly. TIA!


Dennis S. Wish, PE


Dennis S. Wish, PE

California Professional Engineer