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Foundation safety factor for overturning and sliding?

Foundation safety factor for overturning and sliding?

Foundation safety factor for overturning and sliding?

(OP)
Other than the 1.5 safety factor for retaining walls in IBC 1807.2.3, is there anywhere else in IBC or ASCE 7 that states an provides additional necessary safety factor for overturning and sliding, specifically for mat foundations? My prior employer used a safety factor of 3 when checking mat foundation overturning and sliding and a safety factor of 2 when using dead loads adjusted downward for vertical seismic effects (1-0.2*SDS). The strength design load combinations (6 & 7) in ASCE 7 that likely govern overturning and sliding seem to have safety factor built in; a 0.9 dead load (possibly because we over estimate dead load?) and no contribution from live, snow, etc.

RE: Foundation safety factor for overturning and sliding?

The strength design load combinations (6 & 7) in ASCE 7 that likely govern overturning and sliding seem to have safety factor built in; a 0.9 dead load (possibly because we over estimate dead load?) and no contribution from live, snow, etc.

Bingo.... This has been talked about extensively on this website.

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