1/3 stress increase for bearing pressure

[ARLORD]

Does anyone know of code permitted stress increases for foundation bearing pressures involving seismic or wind load cases.

 

[cntw1953]

I think the 1/3 increase on allowables for transient loading cases were out since...?

 

[Lion06]

I think this comes from the geotech. The allowable bearing pressures aren't always given as a strength consideration. Sometimes the allowable bearing pressures are governed by settlement and a 1/3 increase is allowed for transient loads. At least I've seen it explicitly stated in at least one geotech report in the last year.

 

[msquared48]

I agree with SEIT here.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[Ron]

Check Table 1804.2, Note d, in the 2006 IBC...1/3 increase is allowed when considering wind load.

 

[oneintheeye]

uk is 25% with wind loads in conjunction with dead and live