huangyhg

lrfd dynamic load allowance on piles
using the aashto lrfd code (3.6.2.1), i understand that the load used to design piles at end bents, which are entirely below ground, would not have the dynamic load allowance (im) included with the truck live load calculations. as for an interior bent, where piles are partially above ground, i understand that im would be included with the truck live load calculations in determining the loads used to design the piles.
my question then is...when stating the tonnage needed for piles (i.e. based on bearing--some distance below ground on stable soil), would i still include im with the live load? i plan on designing the piles for ll + im, but i'm not sure if i need to include im on the truck load when stating the factored design load in tons, specifically because the tonnage needed is resisted by bearing (or skin friction) of the pile below ground, where im is not usually included. hopefully, you see why i'm torn whether or not i should include im in the tonnage; if i do, it increases the required ultimate bearing (which is the factored design load divided by the geotechnical resistance factor) by about 60 tons!
i appreciate your suggestions...

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