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How to modelate SOIL with springs?

How to modelate SOIL with springs?

How to modelate SOIL with springs?

Which parameters of the soil I must to know to modelate it with springs in the ETABS?
Could you explain me?

RE: How to modelate SOIL with springs?


Soil springs - Structure directly on soil: Then, Subgrade modulus of soil.


RE: How to modelate SOIL with springs?

It's same as when you calculate a beam on elastical supports, you represent soil by coefficient of reaction.
    Soil - loose     k=0.1-0.5 kg/cm3
         - medium dense k=0.5-5
         - dense        k=5-10
         - compact      k=10-20
         - hard         k=20-100
you select joints at base then assign->point spring->kx ,ky,kz...etc.
You must add your fondations as a shell model (slab) the joint correspond to shell mesh.
            i hope this help.


RE: How to modelate SOIL with springs?

Is there any relation between coefficient of reaction (kg/cm3) of the soil and resistance soil support (kg/cm2)?

RE: How to modelate SOIL with springs?

Yes there is a relation between coeficient of reaction and resistance of soil p=-k*y
  where y is the displacement
        p is the pression on the soil
        k is the coefficient of reaction.

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