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frameingineering2014 my method is replacing the (soil and foundation) with a Springs to represent the dynamic stiffness and damping by using link element maybe you didn't consider the dynamic effects and soil properties in your method..

yes it must be equal may be you have a wrong with total weight in Sap..

Dear all I am going to model a simple concrete frame on sap2000 then design it then use nonlinear static analysis (Pushover) Therefore, my question is how can I define material nonlinearity of concrete, rebar and know when the material will crush or inter in nonlinear stage??!! I can see...

HI yazan1990 you can represent the Equivalent stiffness and damping of soil by using link element Instead of springs.. Read the above and download the file that I have uploaded.

what is the stiffness of spring that you modelled is represent?? Is it represent the soil and foundation ?? Is it represent the dynamic stiffness and damping ?? How did you calculate the spring's stiffness??

Thank you… Yes, you are right about body constraint I have read about it in sap's help So i will try and tell you what will happen

Yes… I didn't define nonlinear link and hinges yet cause first i want to model the link area and plate or shell in correct approach then study the push over analysis. Spring stiffness vertically (global Z direction (493 t/m2/m')) is't the same with local 2, U1 and U2 represent translation degree...

Ok ...http://files.engineering.com/getfile.aspx?folder=5bf7a21d-e4ca-4e7f-9010-da6590812c7d&file=Area_Spring_Shell-Thin_With_Diaphram__1cm.SDB

i will send u the sap file to see it...

I am using a nonlinear link to capture the nonlinearity of soil, because I will study the Seismic Behavior of Building Frames Using Nonlinear Static Analysis (Push Over). The foundation is surface and isolated. i said before "George Gazetas rules" replaced the soil and foundation Springs to...

Thank you... I will study The Effect of Soil Structure Interaction on Seismic Behavior of Building Frames Using Nonlinear Static Analysis (Push Over) and i will define nonlinear link property So i wonder how to assign this link to the frame at the base using appropriate way (but not one point)...

Hi... I'm trying to model soil structure interaction on sap2000 I'm using George Gazetas rules to replace the (soil and foundation) with a Springs to represent the dynamic stiffness and damping with six DOF I want to use link element to model the spring but i wonder how i will do that??! 1- at...