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How to modelate a soil in SAP2000?

How to modelate a soil in SAP2000?

How to modelate a soil in SAP2000?

(OP)
I wan to modelate a building with the soil. Because the structure could have settlement. Is a soft soil.

Wich parameters must i put in SAP2000 to modelate la soil?

Thanks.

RE: How to modelate a soil in SAP2000?

you can modelate soil with spring stiffeness.

RE: How to modelate a soil in SAP2000?

Use SAFE is alot easier

=======================================
Diquan
diquan@yahoo.com

RE: How to modelate a soil in SAP2000?

(OP)
which parameters of the soil i must know for use the spring stiffeness?
Could you explain me? I do not understand.

RE: How to modelate a soil in SAP2000?

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.
            i hope this help.

RE: How to modelate a soil in SAP2000?

(OP)
Thanks DENSAL55 for your good response.

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

RE: How to modelate a soil in SAP2000?

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.
 

 

RE: How to modelate a soil in SAP2000?

DENSAL55, i have a question, in SAP2000 v10 the closest thing is "assign->joint->springs->Spring Direction..., Spring Stifness... etc" and the help menu says that the units for that are force/length not force/cubic length or force/square length.

So exactly how that works?

=======================================
Diquan
diquan@yahoo.com

RE: How to modelate a soil in SAP2000?

As for loading
   - when we have a slab i leave the value force/cubic lenght. p=-ky .
   - when we have a beam on elastical support we must multiply the value by the width ( b ) of beam and thus we have force/square lenght. p=-ky/b .
    

RE: How to modelate a soil in SAP2000?


... and for point support we must multiply the value by the two plane dimenssion and we have force/lenght.

RE: How to modelate a soil in SAP2000?

(OP)
DENSAL55.

Could you give me the equation to transform stress(kg/cm2) into Moment(kg-m) in flexural design.
I want understand the transformation, and do it manually to comprobate.
How could I do that convertion?

RE: How to modelate a soil in SAP2000?

See in "CSI Analysis Reference Manual Page 144 "

*Internal Force and Stress Output*

The Shell element internal forces (also called stress resultants) are the forces and moments that result from integrating the stresses over the element thickness.....etc

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