Return to index: [Subject] [Thread] [Date] [Author]

RE: Overturning check

[Subject Prev][Subject Next][Thread Prev][Thread Next]

Allowable load combinations are used to check overturning.  There is no code
requirement to use a stability ratio over 1.0 for seismic.   This is discussed
in 1997 UBC section 1629.1  The allowable stress combinations of section 1612.3
are used.  By the way, a combination 12-16-1 has been added to the UBC:  0.90 D
+ E/1.4

Ed Haninger
Fluor Daniel
Aliso Viejo, CA

"Khosrownia, Ghassem SPK" <GKhosrownia(--nospam--at)> on 02/02/2000
08:39:29 AM

Please respond to seaint(--nospam--at)

To:   "'seaint(--nospam--at)'" <seaint(--nospam--at)>
cc:    (bcc: Ed Haninger/AV/FD/FluorCorp)

Subject:  RE: Overturning check


Where do you get the safety factor from? I don't believe the UBC actually
gives any numbers for seismic OT. I have heard that FOS of 1.0 is adequate
for resistance against EQ induced overturning forces mainly because these
forces are not steady and they are reciprocating. What do you think?