Alternate for pile supports for slab foundation for metal building
Alternate for pile supports for slab foundation for metal building
(OP)
Owner wants to put a 50'x62' steel building on a slab for a quasi-industrial use. Slab designed for HS20-44 vehicle loading. Normally no problem, but geotech report says soil is poor and is recommending piles to support the building. Before I launch into that design, wanted see if anyone had any other recommedations as to how to support that slab...
Problem is that the steel frame in the metal building has pretty good sized concentrated loads (26K) at the perimeter of the slab. Would normally put pad footings there but since the site won't support them, didn't know if I should perhaps look at a combination of a perimter gade beam with pile supports underneath or something else?
Any suggestions?
Also, how much should I be concerned about settlement? Building should be pretty flexible.
Problem is that the steel frame in the metal building has pretty good sized concentrated loads (26K) at the perimeter of the slab. Would normally put pad footings there but since the site won't support them, didn't know if I should perhaps look at a combination of a perimter gade beam with pile supports underneath or something else?
Any suggestions?
Also, how much should I be concerned about settlement? Building should be pretty flexible.





RE: Alternate for pile supports for slab foundation for metal building
As for the foundation, it depends on the soil condition. If only the top 4-5 feet are bad, you may want to excavate and replace. If it is the top 10 or 15 feet, rammed aggergate piers may make sense. Geopiers is a popular name out there. If the bad soils extend 20 feet or so, you are probly looking at piles. If the bad stuff is in defined pockets, you may be able to bridge.
RE: Alternate for pile supports for slab foundation for metal building
Mike McCann
MMC Engineering
RE: Alternate for pile supports for slab foundation for metal building
To msquared48: Haven't done a raft foundation before. Any reference for designing one you'd recommend?
RE: Alternate for pile supports for slab foundation for metal building
RE: Alternate for pile supports for slab foundation for metal building
RE: Alternate for pile supports for slab foundation for metal building
Guess I'll have to wait for the report to see if the geotech will spec any kind of sub-grade modulus I can use.
RE: Alternate for pile supports for slab foundation for metal building
Yes, just to confirm your original thinking. Anyway, the soil report may alter the scenario, good luck.