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Sustained live load

Sustained live load

(OP)
What is the definition of sustained live load?  Where in the code(s) can I find reference to it?  Thank you.   

RE: Sustained live load

Which code(s)?  What is prompting the question?

RE: Sustained live load

I'm guessing this is a question regarding how much LL to consider as sustained for a concrete beam deflection.  We typically use about 1/3.

RE: Sustained live load

(OP)
What I am referring to is the amount of live load to consider when designing foundation elements such as piers and footings.  Typicall a geotech will publish two different bearing capacities (one for full live load and one for sustained live load).  I was asking about which code or codes I might be able to find a reference to sustained live load in.  Thank you.  

RE: Sustained live load

Usually geotechnical engineers will provide two different capacities for, as you say, D + Full LL and for D only (or sometimes for D + 1/2 LL.

None of this is in the code - it is simply a traditional way geotechs attempt to utilize short term vs. long term stresses in soils that fail with long term sustained loads.  So there isn't a code definition here and the best bet would be to contact the geotechnical engineer and have them "go on record" as to what they mean by "sustained" loading - document it - and move on.

 

RE: Sustained live load

(OP)
Thanks for your help JAE.  Now that you mention it, it does seem logical to ask the geotech what they deem "sustained" rather than try to guess.  Thanks again.   

RE: Sustained live load

i've always used about a quarter of the live.

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