soil interaction model in sap2000

[mai2015]

Hi...
I'm trying to model soil structure interaction on sap2000
I'm solid elements to represent the raft and soil
I want to get moment from this model to compare it with anthour model where i represented the raft as shell element and soil as springs but sap2000 gets stresses for solid elements only so :
1- how can i get moments from solid elements in sap 2000?
2- Is there any thesis that discuss this point in soil interaction ?

thanks a lot

mai

 

[Thanh123]

Hi,
Is it OK when you solid elements to present the raft and soil? They are different material. Can define link element (like gap) to present this connection.

 

[PlasmaStruc]

Moment is a concept based on the stress and lever arm. Moment is defined only for Beams and Planes where its thickness (or cross section ) is based on the section property. If you want to get the moments for a solid, you have to calculate it manually by taking the stresses on either side of the solid block and then based on the section modulus the moment has to be calculated.

 

[mai2015]

PlasmaStruc i tried to get the moments manually by getting the max stresses at the joints of solid element and applying the equation stress=M*y/I ,,but i think i have to integrate the stresses along the faces of solid element what do you think?