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RE: Dual System - SCBF w/SMRF[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Dual System - SCBF w/SMRF
- From: "Yousefi, Ben" <Ben.Yousefi(--nospam--at)ci.sj.ca.us>
- Date: Fri, 12 Nov 1999 09:56:26 -0800
Ed I would put in my 2 cents about why IMHO this is a superior system: The main advantage is drift control. Much of the damage to SMRF's in Northridge could possibly have been avoided if a dual system was used rather than only SMRF's. The large displacement demands on the connection is probably one of the major causes of the connection failures. As far as I know no damage was reported to the connections in any buildings that utilized dual system (although that might be because there were no such buildings in that area!). In a dual system the SMRF is a backup to the braced frame and it is only required to resist a minimum of 25% of the total load. However, there is no limitation on the height of a building that uses this system, whereas for braced frame only, there are such limitations. As far as the distribution of loads it is basically distributed in accordance to the rigidity of the lateral force resisting elements (hence a rigid type diaphragms is required for such system). Usually a 3D analysis is performed for evaluating the response of such buildings. Ben Yousefi, SE San Jose, CA -----Original Message----- From: Eddie Gonzalez [SMTP:Eagonzal(--nospam--at)ENG.CI.LA.CA.US] Sent: Friday, November 12, 1999 8:05 AM To: seaint(--nospam--at)seaint.org Subject: Dual System - SCBF w/SMRF The Code seems to allow one to used a dual system composed of SBCB w/ SMRF. Has anyone ever used such an animal. If so, Q1: What does it usually look like - perimeter frames with braced core, or adjacent SMRF in same brace line or even both a SMRF and SBCB in the same bay. That last version would seem to be a connection nightmare. Q2: Do you have difficulty evaluating the overall response, being that one system is usually much stiffer than the other? Q3: Why might one seek to used this - - architectural restrictions? Ed Gonzalez p.s. The SEAOSC seminar on SCBF by the AISC-LA Chapter was very insightful and packed full of information. If anyone did not get to go, you should try to get the notes from SEAOSC.
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