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Overturning Moment Factor of Safety

Overturning Moment Factor of Safety

Overturning Moment Factor of Safety

(OP)
The good old UBC use to allow us to design shear walls using 2/3 dead load of the wall for calculating overturning moment.  Now it seems the new 2006 IBC doesn't specifically specify this anywhere that I can see.  So does that mean I'm back to the basic load combination .6D + W ? Thanks   

RE: Overturning Moment Factor of Safety

that is correct.  There is also a note in IBC ( I don't remember exactly where) that says you need a factor of safety of 1.5 for overturning.  I don't know if that was meant to be used in conjunction with the 0.6D or in place of it.

RE: Overturning Moment Factor of Safety

(OP)
StructuralEIT-  I guess thats the question I'm asking.  Is the IBC saying the overturning F.S. is now 1.66666 (.6 dead load) or does is still say somewhere 1.5 (2/3 dead load)?

RE: Overturning Moment Factor of Safety

I don't think there is still a 1.5 SF in the IBC.  It is now covered by the 0.6D+W load combination for ASD and the 0.9D+1.6W for LRFD

 

RE: Overturning Moment Factor of Safety

(OP)
Thank you.  That's kind of what I thought.   

RE: Overturning Moment Factor of Safety

Sorry, that F.S terminology is in there just for retaining walls, but I guess the same question still applies.

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