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RE: redundancy factor
[Subject Prev][Subject Next][Thread Prev][Thread Next]- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: redundancy factor
- From: "Cain, William" <bcain(--nospam--at)ebmud.com>
- Date: Wed, 17 May 2000 13:58:05 -0700
Wait until you get to the IBC 2000. In calculating the rho factor, they limit r (did they really mean rho? :<) ) by the statement: "shall not be less than 1.0, and need not exceed 1.5" (Section 1617.2.2). Since rmaxi is defined as "the ratio of the design story shear resisted by the most heavily loaded single element in the story to the total story shear, for a given direction of loading" the effect would be to raise calculated rho values because this wording would assign from 1 to 1.5 times the TOTAL STORY SHEAR to the single most heavily loaded element. Personally, I think this is yet another formula screw-up in the IBC as I assume it is intended to be basically the same as the 97UBC which limits rho to being within this range. But one never knows........ [ROTFL]. Regards, Bill Cain, S.E. Oakland CA -----Original Message----- From: Paul Crocker [SMTP:paulc(--nospam--at)ckcps.com] Sent: Wednesday, May 17, 2000 4:29 AM To: 'seaint(--nospam--at)seaint.org' Subject: RE: redundancy factor The definition of r(max) used in the redundancy equation is based on the worst case that occurs below the 2/3 point of the building for a given direction (1630.1.1). Hence, if your first floor requires 1.2 in one direction, you must use 1.2 on your second floor in that direction, too. Paul Crocker -----Original Message----- From: Francisco Duarte [mailto:fduarte(--nospam--at)LEASUNG.COM] Sent: Wednesday, May 17, 2000 9:55 AM To: seaint(--nospam--at)seaint.org Subject: redundancy factor Let say you are designing a two story building and in your redundancy check you calc. out redundancy= 1.0 for all the second story force but once you are in the first floor you calc. out a redundancy=1.2 on one direction. Now my question is do you must increase the second story force in the same direction by the 1.2 factor or you just do the 1.2 increase in the first floor at that specific direction ? any help will be much appreciated. Francisco Duarte,E.I.T.
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