Problem modeling precast wall

[swedeng]

Hello!
I'm trying to do what they are doing in the short clip (FEM-DESIGN software) that I attached here:

https://www.youtube.com/watch?v=UJV1uE-Kayk&t=250s

I can not get this to work in rfem. I really want to learn how but i can't find the right settings in rfem. I get instability issues and so on.

Could someone help me, is there a similar video from rfem about this? Is there some part of your manual you could recommend me to read?

I will attach two images of the settings I made in rfem. In FEM-DESIGN you have edge connections - how can I make the same kind of settings in rfem?

[Frank Faulstich]

Hello. In the pictures I see several problems.

In RFEM you calculate three-dimensionally. In FEM-DESIGN only a plane system is calculated.

The line support is defined so that the RFEM model can rotate around the global X axis. This is one cause of instability.

The problem can be solved if you set the model type "2D - XZ" in the basic data of the RFEM model.



Alternatively, additional supports could be integrated into the 3D model to hold the model in the Y-direction.

The second problem is that line hinges have been defined around the surface. It makes no sense to insert line hinges at free edges of the surface. Line hinges should be used to define the transfer conditions between two surfaces.

Especially on lines with line supports, line hinges should not be defined additionally.

The edge connections in FEM-DESIGN seem to be something similar to the line releases in RFEM. Line releases are a special type of line hinges for which you can also define a non-linearity. For further information, please click here:

https://www.dlubal.com/en/support-an...ort/faq/002777

Frank Faulstich

[swedeng]

Hello Mr Faulstich!

Thank you for the answer. I'm a junior engineer so please be patient with me. :-)

I will try with the input you presented.

Thank you once again!

Best regards,

"Swedeng"