1/3 Stress Increase History
1/3 Stress Increase History
(OP)
With the 1/3 stress increase being phased out, I began to wonder exactly why it came about. So far the research I have done still has not given a definative answer on how the stress increase came about. Doe anyone know the history of the 1/3 stress increase or a good reference on the topic? Thank you in advance for your assistance.





RE: 1/3 Stress Increase History
See article by Duane Ellifritt entitled "The Mysterious 1/3 Stress Increase."
costs $10 for non-members of AISC.
RE: 1/3 Stress Increase History
RE: 1/3 Stress Increase History
Try www.aisc.org/stressincrease
RE: 1/3 Stress Increase History
Dealing with the 1/3 stress increase, I have been working on a project which has been peer reviewed. The project is in IBC 2003. The reviewer has told me they have taken a 4/3 increase on the allowable bearing pressures in the geotech report. I scoured the IBC looking for where you can do that, but found nothing, however the reviewer insists his design "savings" due to smaller foundations with the 4/3 increase is code compliant.
Have any of you seen anything like this allowed in the code?
RE: 1/3 Stress Increase History
RE: 1/3 Stress Increase History
RE: 1/3 Stress Increase History
RE: 1/3 Stress Increase History
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Is anyone aware of a failure being attributed to use of the 1/3 allowable stress increase?
RE: 1/3 Stress Increase History
RE: 1/3 Stress Increase History
RE: 1/3 Stress Increase History
RE: 1/3 Stress Increase History
movement and the duration of maximum loads due to wind or seismic event is short.
RE: 1/3 Stress Increase History
Allowable bearing pressures for clay soils are usually chosen on acceptable settlement criteria.
Not sure if this applies to sands/gravels though.