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RE: Handrail Loads vs Short Term

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Harold, Dr. Hamida, engineers,


It seems like the most significant place a one-third
allowable stress increase is still permitted is when designing footings with
the appropriate load combinations.  I'm
looking at footnote d on table 1804.2 of the 2006 IBC which specifies "allowable
foundation pressure" and "lateral bearing pressure."  


On the other hand, there is the requirement for a soil
investigation in section 1802 for anything in seismic design class C or
higher.  An investigation could trump
table 1804.2 and the one-third increase. 
Is that right?  


Mark Johnson

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