Modelling a nodal spring in Altair hyper works (Optistruct)

Mohamed_ABDO

Hello,

I am attempting to model a concrete slab that rests on soil, and I wish to represent the soil using spring elements. I would like to know which spring element type I should use to define the stiffness in the x, y, and z directions (Kx, Ky, and Kz).

I have tried using CBUSH and CBUSH1D elements, but I have found that they only allow me to define axial stiffness, which results in differences compared to the model where the soil is represented using solid elements.

Could you please advise on the appropriate spring element type that would enable me to define stiffness in all three directions (Kx, Ky, Kz) accurately?

Thank you for your assistance.

Best regards.

Rajashri_Saha

Hi,

For defining stiffness in different directions, you should use CBUSH element with PBUSH property.

In K1 to K6 fields , you can define stiffness values in directions 1 through 6.

Refer the below link to know more on PBUSH property.

https://help.altair.com/hwsolvers/os/topics/solvers/os/pbush_bulk_r.htm#pbush_bulk_r__pbush_bulk_r_fn_gfx_xvv_j1b

Thanks

Rajashri