Is there any material in stko that can simulate nonlinear spring?

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2443631711@qq.com
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Is there any material in stko that can simulate nonlinear spring?

Post by 2443631711@qq.com » Tue Mar 14, 2023 9:23 am

Dear stko team
Is there any material in stko that can simulate nonlinear spring?(Using zerolength element)
Its spring stiffness can not be a constant, but a customized curve
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STKO Team
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Re: Is there any material in stko that can simulate nonlinear spring?

Post by STKO Team » Wed Mar 15, 2023 8:24 am

There are many. Try the Pinching4

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Re: Is there any material in stko that can simulate nonlinear spring?

Post by 2443631711@qq.com » Fri Mar 17, 2023 2:23 pm

Dear stko team
i have two qusetions
(1)I saw physical properties from Pysimple and Tzsimple in stko.
If I build a two-dimensional model and want to use them to simulate the zerolength connection between the liquefied soil layer (quadup element 3dofs) and the underground structure (electrical beam column element 2dof)
Can I only use the zerolengthcontactASDimplex element? Is there any other zerolength element that can be used?
(2)If the underground structure is not a pile foundation, but a tunnel or subway station, can Pysimple1 and Tzsimple1 materials be used to simulate the contact between soil and structure?

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Re: Is there any material in stko that can simulate nonlinear spring?

Post by STKO Team » Fri Mar 17, 2023 5:00 pm

(1)I saw physical properties from Pysimple and Tzsimple in stko.
If I build a two-dimensional model and want to use them to simulate the zerolength connection between the liquefied soil layer (quadup element 3dofs) and the underground structure (electrical beam column element 2dof)
Can I only use the zerolengthcontactASDimplex element? Is there any other zerolength element that can be used?
The zeroLengthASDimplex is for contact. If you want to use those 2 uniaxial material, use them with a standard zeroLength element.
(2)If the underground structure is not a pile foundation, but a tunnel or subway station, can Pysimple1 and Tzsimple1 materials be used to simulate the contact between soil and structure?
Yes, with a standard zeroLength element as exaplained above

2443631711@qq.com
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Re: Is there any material in stko that can simulate nonlinear spring?

Post by 2443631711@qq.com » Sat Mar 18, 2023 8:36 am

ummm..actully what I want to ask is whether the zeroLengthASDimplex element is the only zeroLength element used to connect 2dof and 3dof nodes

STKO Team
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Re: Is there any material in stko that can simulate nonlinear spring?

Post by STKO Team » Mon Mar 20, 2023 8:39 am

Oh yes, it's the only element that supports different DOFs at the 2 end-nodes.
With other elements, you need to duplicate nodes, and use the EqualDOF command to connect corresponding DOFs

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