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0.6D+W Load Comb and 1.0 Factor of Safety

0.6D+W Load Comb and 1.0 Factor of Safety

0.6D+W Load Comb and 1.0 Factor of Safety

(OP)
This old thread deals with an internal discussion we are having in my office currently.

thread507-202887: 0.6D+W Load Comb and 1.0 Factor of Safety

In the referenced thread, WillisV states the 0.6D+W combination for overturning assumes a 10% over-estimate in the gravity load (0.9D). Does anyone have wisdom or guidance as to where this idea of an overestimate comes from? Has the wording in the newest IBC cleared this issue up?

Thanks,
Steven

RE: 0.6D+W Load Comb and 1.0 Factor of Safety

It comes from WillisV's posterior

RE: 0.6D+W Load Comb and 1.0 Factor of Safety

"Overestimate" in the sense that it may not weigh as much in actuality as the tables allow.

Mike McCann
MMC Engineering

RE: 0.6D+W Load Comb and 1.0 Factor of Safety

I think it's just to provide a bit more than a 1.5 safety factor against overturning. 1/.6 = 1.667, and to get it closer to the LRFD load combination of 0.9D + 1.6W which gives a 1.78 safety factor against overturning. (based on ASCE 7-05)


RE: 0.6D+W Load Comb and 1.0 Factor of Safety

(OP)
Great. Thank you all. Glad to see you are still around WillisV; your answer in the old thread helped clarify the questions we were having.

RE: 0.6D+W Load Comb and 1.0 Factor of Safety

Glad to be of assistance - I'm happy I'm still around as well, much better than the alternative.

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