IBC 2003 Question Again

[aggman]

I wanted to get some feedback about what others are doing in seismic design. I typically design structures for industrial applications, mostly for material handling of bulk materials. Typically we are in low seismic regions (C or less) and utilize the ELFP and systems not specifically designed for seismic resistance. My question comes as follows. My boss feels that when you are allowed to not specifically detail the structure for seismic resistance then you just calculate the seismic load in a brace, etc. based on equation 16-50 and 16-51 and design the connection basically like you would any old connection. He feels that only you are using the more stringent requirements and are detailing the structure for seismic resistance that you must then consider EQ 16-19 & 16-20. I guess I always just kind of accepted this as true and moved on designing as he instructed me to do. It just so happens that I have began studying for my P.E. exam and was looking into some of these things more closely. (Basicaly I am reading the code page by page.) I guess after reading through it and looking at Alan Williams book on wind and seismic engineering I am concerned that you must not always design the brace for the special load combinations. I hope my question has not confused everybody, but I would just like to see a little feedback as to what others feel is correct.

Thanks for your time as always!

 

[mrMikee]

aggman,

This is another part of the code that I'm not to sure about. Section 1605.4 for "Special seismic load combinations" and section 1617.1.1.2 "Maximum seismic load effect Em" are not general requirements but needed only when specifically called for in a certain part of the code. And I'm not remebering what those are right now.

A relavant thread is, and maybe you have already seen this, is ... thread726-126245

I recently got the 3 volumne set "2000 IBC Structural/Seismic Design Manuals" but haven't gone through them yet. If I find anything I will post it here.

Good luck with your PE.

Regards,
-Mike

 

[aggman]

Thanks for the thread. It seems to me like you need a PH.D in code reading just to interprete when you have to design something a certain way or not.

 

[mrMikee]

From AggieYanks post of yesterday I see the final hearings for the IBC 2006 are next month. This will be another $100 and I'm still trying to understand the 2003 version.

http://www.iccsafe.org/cs/codes/2004-05cycle/2004-2005CodeDevSchedule.pdf

Regards,
-Mike