Soil / Earth Seismic Load on Structures on Slopes
Soil / Earth Seismic Load on Structures on Slopes
(OP)
i remember there's some code line that says something to the effect of, where structures sit on sloping grades where the grade difference between the two opposing sides is 6' or over, the structure's LFRS shall be designed for seismic forces from the soil.
is this clause in the IBC somewhere? ASCE 7?
thanks in advance.
is this clause in the IBC somewhere? ASCE 7?
thanks in advance.






RE: Soil / Earth Seismic Load on Structures on Slopes
ASCE 7-10's Expanded Seismic Commentary: http://ascelibrary.org/doi/pdf/10.1061/97807844129...
Structure Magazine article Location of Base for Seismic Design http://www.structuremag.org/wp-content/uploads/201...
RE: Soil / Earth Seismic Load on Structures on Slopes
RE: Soil / Earth Seismic Load on Structures on Slopes
thanks i've seen that clause... this is me being a code reader; it says the geotechnical report must have that information... but i don't see where the code says the building's LFRS must be designed for it?
i know it's implied, but i swear there was another section. maybe it was in an older code.
RE: Soil / Earth Seismic Load on Structures on Slopes
I think IBC §1803.5.12(1) doesn't directly relate to the location of the seismic base. It requires the soils report to include the seismic lateral loads on foundation walls and retaining walls with more than 6' of backfill. If a building has a full basement entirely below grade with stiff soils, the ground level may a suitable seismic base. The lateral loads from the soils report (along with the loads from the structure above) are used to design the basement. But, the ground motion is assumed to act on the structure at ground floor level.
RE: Soil / Earth Seismic Load on Structures on Slopes
i wanna be an SE too (in california) - failed last october (both portions, sadly), but will be trying again this coming october. been going through SEAOC's 5 volumes, and soon will be looking at those bridge books by connor, and ppi's six minute solutions and their practice exam. i went through ppi's reference manual and hated the book (thought it was much to broad and vague).
good luck to you, whether awaiting april's results or for october's upcoming test!
RE: Soil / Earth Seismic Load on Structures on Slopes