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Dynamic Load on Foundation from Screen

Dynamic Load on Foundation from Screen

Dynamic Load on Foundation from Screen

(OP)
I am adding a new wood chip screen, and need to design the concrete foundation.  I have been given the following from the screen vendor.  These loads are typical 4 places.
Fvstatic = 25k
Fhstatic = 5k
Fhdynamic = 1k
I would like to do spread footings.
How do I treat the dynamic load?  I know I can not act like it is a just a static load.  Any info would be helpful.

Thanks,
Deflected   

RE: Dynamic Load on Foundation from Screen

That would be a good question for the geotechnical engineer. There are some soils (i.e. sandy) that can't take sudden [large] increases in pressure (ergo they do not make good support soils for dynamic loads). Your dynamic load here seems to be light so there may not be a problem.....but I lean heavily on the geotech because that's his area.

RE: Dynamic Load on Foundation from Screen

If I were given something from the vendor of that nature I would treat it as an amplified force and design the foundation for 6kips lateral.

RE: Dynamic Load on Foundation from Screen

You need to look at the vibration spectrum as well as the magnitude of the dynamic force.  A chip screen might have a frequency spectrum that will make your shallow foundation act like a large vibratory compactor....resulting in settlement.

Most of these are set on shallow foundations, assuming reasonable soil conditions.  As 3dd noted, check with the Geotech for soil response characteristics.

RE: Dynamic Load on Foundation from Screen

(OP)
Thanks guys,
Upon further review I think I am actually going to go with Micro Piles.  I have some existing footing interferences and space limitations.

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