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RE: PEMB and AISC Seismic Provisions[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: RE: PEMB and AISC Seismic Provisions
- From: "Haan Scott M DPW CIVIL ENGR(n)" <scott.haan(--nospam--at)richardson.army.mil>
- Date: Fri, 20 Dec 2002 01:19:04 -0000
I would not freak out about losing the low building exception. It looks like they made the code a whole lot simpler. It basically tells you to design the frame for the special load combinations and it gets rid of a bunch of other checks. It does not say that you need to meet B/t ratios or have less than an 80% brace stress ratio or have less than 70% of braces in tension or compression. You can still have tension only braces.
Where it sticks you is requiring to meet the slenderness ratios for chevrons even with special load combinations and making you design connections for the nominal axial tension strength of the member. What I am wondering is if the new edition of the IBC limits the height of ordinary braced frames now?
Scott M. Haan P.E.
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