Raft foundation for flat bottom grain Bin
Raft foundation for flat bottom grain Bin
(OP)
We have been engaged to design a raft foundation for a flat bottom Westeel corrugated grain bin. Dia. 33 ft., capacity 39,000 bu., overall ht. 60 ft. dl 2l,000 lbs. I was hoping one or more of you fellows could tell me how you would calculate the appropriate slab thickness and reinforcing.
We have a Geotechnical subsurface soils report. The soil is glacial till (undrained shear strength: 60 kPa.. moist & very stiff) overlain by about 3 ft. of moist to wet sand. Suggestion from Geotech: replace the sand with compacted engineered granular fill. No significant water in the till to at least 25 ft. Typical winter frost dept here 5 to 6 ft.
We have a Geotechnical subsurface soils report. The soil is glacial till (undrained shear strength: 60 kPa.. moist & very stiff) overlain by about 3 ft. of moist to wet sand. Suggestion from Geotech: replace the sand with compacted engineered granular fill. No significant water in the till to at least 25 ft. Typical winter frost dept here 5 to 6 ft.






RE: Raft foundation for flat bottom grain Bin
Talk to your geotech and get their recommendation. It's better to work closely with them than try to make things up. How to design it really depends on what structural function your foundation is performing and where you need to carry your resisting geotechnical loads from.
RE: Raft foundation for flat bottom grain Bin