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RE: Setbacks on buildings subject to seismic[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: RE: Setbacks on buildings subject to seismic
- From: Scott Maxwell <smaxwell(--nospam--at)engin.umich.edu>
- Date: Fri, 17 Dec 1999 13:44:22 -0500
Ben, Thanks for the comments. However, I would doubt that the irregularity will trigger a dynamic analysis in my case because this building is in Detroit, which under UBC would be Zone 1. I did find a section discussing setback type conditions in Section 104.8.2 and 105.3.1 of the 1996 Blue Book. Both these sections deal with the Static Force procedure. I asked the question more to make sure that I didn't miss any other sections that might pertain. BTW, I do also have the Appendix that contained the "purpose" procedures from the 1990 Blue Book. Ultimately, I am not governed by either UBC or the Blue Book, but since the BOCA code doesn't really directly give any methods to handle setbacks (I still have to take a closer look at how it deals with "irregularities"), I was looking for a rational method that I could use/incorporate with the standard BOCA code method. I knew about the Blue Book appendix because I had used it several years before on a similar situation (again the governing code is BOCA). Thanks again, Scott At 10:08 AM 12/17/99 -0800, you wrote: >Most of the discussion in the blue book has been incorporated to UBC and IBC >in the form of structural regularity (tables 16-L and 16-M of UBC). There >are different procedures (Static vs. dynamic) depending on the building >regularity and soil condition that needs to be used. If you have a highly >irregular building, which based on your description you may have, you will >end up using the dynamic procedure, which will address the setback issue in >a more comprehensive manner, that static procedure. > >Ben Yousefi, SE >San Jose, CA > > > -----Original Message----- > From: Scott Maxwell [SMTP:smaxwell(--nospam--at)engin.umich.edu] > Sent: Friday, December 17, 1999 7:27 AM > To: seaint(--nospam--at)seaint.org > Subject: Setbacks on buildings subject to seismic > > A question for all you real structural seismic people. > > I have a building with a setback (i.e. a main pedestal of a building >with a > "tower" portion sitting on top of the pedestal). In reality, it is >an > existing building in which we will be cutting out some of the middle >bays > for the upper floors. The result will be a pedestal with two towers > sitting on the two sides. > > I have used a suggested procedure(s) for analyzing setback buildings >in the > past that was contained in an Appendix of the SEAOC Blue book. That > Appendix is no longer present in the 1996 Blue book. I am assuming >that > this has been incorporated into the main body of the newer Blue >books (i.e. > 1996). The question is: Can any one tell me where this might be >addressed > in the newer versions of the Blue book? I ask because I am not as >familiar > with the Blue book, since most of Michigan uses the BOCA code. I >believe I > found it in the Blue book but I want to make sure that I am not >missing > other parts that may also address this. > > Thanks, > > Scott > > >
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