Dear Researchers

I want to define an equivalent structure that has beam element for columns and lumped mass in each story.

I have the mass and stiffness matrix for this structure.I want to use these matrix in ABAQUS.

Is there any way to input these matrix in ABAQUS directly?

I want to use UEL subroutine for my model but I don't have any data about ABAQUS subroutine.

Also, I read ABAQUS manual and unfortunately I can't find anything clearly...

Where should I write UEL codes? then How should I run and use it?

Does anyone know how does it work?

Can anyone describe the procedure of using and run the UEL?

Please give me examples.

I await your response in kind.

Best Regards,

Azadeh