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Sorry for the late response, dmoler. I agree that group capacity and group settlement are two different issues. They are not related if the total loading on pile cap is given and fixed. But they are related if total loading can be reduced depending on allowable capacity from pile. I may...

International Building Code (IBC 2003, Chapter 18) indicates that the allowable load shall not be more than one-half of that test load that produces a gross lateral movement of 1 inch at ground surface. If IBC is your governing code you have to follow it. If not I would still use this as a good...

Thanks for your inputs, GeoPaveTraffic and dmoler. McVay et al. (1994) and O'Neill et al. (2002) has concluded that ACIP piles behave more like drilled shafts in sandy soil than driven piles and the FHWA method for drilled shafts yielded the closest prediction of compression capacity for ACIP...

In deed the IBC 2000 causes a lot of confusions in the geotech community. The seismic design provisions of IBC 2000 is based on 1997 NEHRP, but not everyone will go check its commentary or NEHRP, as Damguy does. Other misleading parts are: 1) SPT N values used are uncorrected directly from the...

Can anyone provide some info about group effect for ACIP piles w/ spacing 3-6 D, not end bearing (in loose to medium dense sand)? Any reference books, papers (specific title, author if possible)? I have a couple of papers/manuals that mention reduction factors for drilled piers, but not for...