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hi to all, is it ok to use Force-Deformation and Moment-Rotation data for the Uniaxial ElasticMultilinear Material command ? Normally command comes with "Uniaxial ElasticMultilinear Material -strain ...... -stress .....". I wonder, should I write "-strain and -stress" when ı use ...

thanks for all your replies @IsmBaha @gor

is there any command or tcl file for material tests? I have force&deformation and moment&rotation values, and I will use paralel material which means that I have two different material type be connected. So, I wanna check if the material that I have defined works or not.

thanks

Hi to All, I need to define a material type for a steel connection design. In tension zone of the material type will be a curve but the compression zone will be linear. I mean, I dont want my connection yield under compression. For this kind of behavior, which type of material can be used and how? F...

thank you, it was so helpful.

thanks for your answer, one more question : what could be the reason of not to see anything else apart from a small window? I mean there is no graphics, window is empty.

recorder plot dis.out displacement 1200 10 400 400 -columns 2 1; could someone explain what -column 2 1 is? how do we decide these two numbers (2 and 1)? are they any of column numbers or not? and when I change 1200 10 into 0 0, what is happening? Also, when I use this recorder plot, just a small wi...

Dear michaelchen Did you solve the problem ?? I am getting negative eigenvalues too but I couldnt find any solution yet. what could be the reason of this?? Dear mhscott I did (puts $lambdaI) after puts "6" and I get -3,5694231 e-004. could you give me some directions about the solutıon? wh...

hi,
when you find a solution for these issues, could you please write here? I have been struggling against the problem that you mentioned for a long time. But I coulndt find any solution yet..

Dear fmk
When we apply uniform loads to braces, which direction sould we use ? because in local axes, it is not including downwards direction.

Dear hshoar,
İf you find any answer for your question, could you please write here ? Because I am also confused about it.

check your model if there is any hanger node. or check your connections. Generally LAPACK problems is about convergence.

what is .thf extention? and how can I open it? does anyone have an idea? I have seen it when I did a ground motion analysis, for exmple : pathfile.thf

thank you

if you try to fix a node your command sould be like this:

if it is 2D
fix a 1 1 1 >> a is your node number and you have 3 DOF

if it is 3D
fix a 1 1 1 1 1 1 >> a is your node number and you have 6 DOF

thanks for answer Mr. Michael but I have also tried 100 but it is not working. how many steps do you offer to try? Also my model includes fiber sections. could it be the problem? if it is, what can I do to solve it?