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Re: asd vs lrfd

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Agreed.  But the factor of safety used for soils is often around 2 to 3 so IF
the soil does not fail (ie sliding, overturn, etc.) the concrete may have to
be capable of withstanding the ultimate load still.

Regards,
Joe McCormick

At 07:27 PM 10/14/97 +0500, you wrote:
>
>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.   
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