Dynamic Load on Foundation from Screen

[Deflected]

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

 

[3doorsdwn]

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.

 

[rscassar]

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.

 

[Ron]

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.

 

[Deflected]

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.