RE: FEMA 350 and SMRF's[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: FEMA 350 and SMRF's
- From: Nicholas Blackburn <nblackburn(--nospam--at)fdgoak.com>
- Date: Thu, 8 Feb 2001 08:28:50 -0800
In general, FEMA 350 section 2.6.1 Material Specifications recommends the use of A992 or A913 for SMRF's due to their more well defined properties. A992 is similar to A572 Gr50 but has max and min yield strengths. Note that this is a recommendation and it is acceptable under FEMA 350 to use the specifications and grades permitted by the 1997 AISC Seismic Provisions although there are some material overstrength factors to apply depending on your choice.
There are now 8 prequalified connections for SMRF's with certain member size restrictions. FEMA 350 provides detailed design criteria for each option. For an RBS system, FEMA 350 section 3.5.5 Table 3.6 limits the materials for beams to A572 Gr50, A992 or A913 Gr50/S75 and materials for columns to A572 Gr50, A992 or A913 Gr50 and 65. Column sizes may be from the W12 or W14 tables. There is a host of other requirements but if you can meet them, no testing is required.
FEMA can be reached at (800) 480-2520 to order books, although I ordered 4 publications over a month ago and they still haven't arrived.
The AISC Seismic Provisions and supplements can be downloaded in PDF format from www.aisc.org.
Nicholas Blackburn, PE
From: Pat Clark [mailto:bcinc(--nospam--at)nanosecond.com]
Sent: Wednesday, February 07, 2001 5:01 PM
Subject: FEMA 350 and SMRF's
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