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Thanks Frank, I don't get the idea of getting rid of equalDOF commands. Is that specifically for translational springs?.. If I do that, system becomes unstable..and I get consistent errors. I even tried same idea for rotational spring case, meaning..cancel equalDOF commands and use; fix 11 1 1 0; fi...

Thanks again for your time.. I have a follow up question to make sure I understand correctly..What if I define a translational springs instead. If i got it right, this time the springs would work in direction 4..is that correct? I mean we'd be dealing with dofs 2 3 4. I tried it in same model; first...

Thanks for replies, Silvia: I got same nodal displacements for different stiffness cases as well... Andre: Your changes helped. I get different forces. The springs seem to work after all. However, I got a little confused considering my model is 2D and this is specified in ''model basic -ndm 2 -ndf 3...

Hello all, I worked on a simple model in order to understand how to introduce springs to our model...I have two separate, centrally loaded beams; simply supported and fully fixed...I got the results for both and they're ok..but when I introduce elastic rotational springs at the ends..regardsless of ...

I'm currently having the same problem..I wanted to define translational and/or rotational springs at supports. I've been following the discussions and wondering if you guys have figured it out...
I'd appreciate if you let me know..

Hi Silvia, Thanks for reply..I was wondering if ReinforcingSteel material could be used/modified for structural steel..or is there a way to define stress-strain relationship as in that material. I guess the relationship could be approximated by using hysteretic material but there'd be no reason to d...

Hello all, I'm performing a large deflection analysis of steel beams. I'd like to incorporate strain hardening in material but existing "Steel" materials do not match with my intentions. The definition of ReinforcingSteel material seems to be closer to what I want but I guess this is inten...

Could anyone please clarify this issue?

thanks for reply,I'm sorry I should have specified that.But it's large deflection problem so,I'm using corotational transformation...

I'd appreciate your help..

Hi all, I am conducting a large deflection analysis and using NL beam-column element.I have a couple questions regarding element forces; 1) Is the element local coordinate system based on deformed or undeformed configuration,in other words,for instance;is local Fx in the direction of element chord?....

Thanks for reply, But I guess my question is when modeling a beam with a large number of elements..I want to get section deformations along the length,let's say we have 1000 elements,the output file is supposted to be consist of 2000 (strain and curvature) columns corresponding the load fraction...I...

Hello all, I have problem recording the element section deformations when using large number of elements in the model..I want to record the curvatures along the length (in one file) of the member,so when I use large number of elements,program fails to run...Here's the command I use for that.. record...

Hi, I'm a new user ,I have a question and would appreciate your help.. Is there a nodal rotation recorder?..Considering plastic analysis of a fixed-fixed beam,I tried 2D/3D modeling but for both cases I got zero rotations...For 2D I specified DOF 3 for rotations and 6 for 3D case... I'm using nonlin...