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Re: asd vs lrfd

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Joe McCormick wrote regarding foundation design: 
 
> Perhaps this line of reasoning should be considered:  Load factors are used  
> to predict what might happen under "ultimate" loads, not service loads.  
> When the ultimate loading occurs, the point of zero soil pressure WON'T  
> be in the same place as it is under service loads! 
 
That's true.  As a matter of fact, under ultimate load conditions the soil may 
have compressed such that the loads are redistributed in the structure or the 
retaining wall may have failed in sliding!  IMHO ultimate loads generally 
don't represent realistic conditions for foundation design.