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RE: ICBO Seminar for 1997 UBC Earthquake Regulations[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: RE: ICBO Seminar for 1997 UBC Earthquake Regulations
- From: Richard_Ranous/OES(--nospam--at)oes.ca.gov
- Date: Tue, 21 Apr 1998 10:51:30 -0700
Dennis, For my $.02 worth on the diaphragm issue: In reality there is no such thing as a truly flexible diaphragm. A tributary area distribution of diaphragm shear is only accurate when you have a box with solid lines of resistance where the stiffness of each line is reasonably the same. In the examples which have been discussed, solid plywood shearwalls on one side and cantilever columns on the other line will result in some form of stiffness distribution because the stiffness of the diaphram is well in excess of the stiffness of the columns. I'm not sure that Ernie is proposing that the design of the examples be based on some form of rotation, but more recognizing that the actual distribution of load will be different than straight tributary area.
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