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1/3 stress increase for bearing pressure

1/3 stress increase for bearing pressure

1/3 stress increase for bearing pressure

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

RE: 1/3 stress increase for bearing pressure

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

RE: 1/3 stress increase for bearing pressure

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.

RE: 1/3 stress increase for bearing pressure

I agree with SEIT here.

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

RE: 1/3 stress increase for bearing pressure

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

RE: 1/3 stress increase for bearing pressure

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

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