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I have used it in a 3D model, how else would I have done multi-directional loading, and it worked fine.

Silvia, what he is doing is right. At least it is right according to how I have used "sp" before.

If you take the same model and change it to Displacement control and cycle it that way then it works.

THanks, I want to make like a hinge, I hadn't thought of the double node.

Is it possible to release a specific DOF on an element. Say you want to release the moment at the end of a beam element. How would this be accomplished?

Thanks

Silvia,

Does this question show up often enough to add a example of it? I wrote a quick example for mbazan, do you want it?

Silvia has it. Here how I do it on a regular basis, I needed to apply a displacement history to different DOF on the same node. set SeriesPath1 "Path Series -dt 1 -filePath Y_Displ.txt" set SeriesPath2 "Path Series -dt 1 -filePath Z_Displ.txt" pattern Plain 2 $SeriesPath1 { sp 8 ...

I will give that a try, but that is weird because I have done it that way many times before and never had a problem with it.

Ok, when I run the following script it executes just fine. model basic -ndm 3 -ndf 6 # Create nodes node 3 0.0 0.0 377.77 node 5 72.0 0.0 377.77 node 7 144.0 0.0 377.77 node 9 216.0 0.0 377.77 node 11 288.0 0.0 377.77 node 13 360.0 0.0 377.77 node 15 432.0 0.0 377.77 node 4 0.0 0.0 -377.77 node 6 72...

Okay, the tension steel will have some residual strain, use a stress-strain recorder to confirm this. But if you take it back to zero displacement you will see the column has some displacement when it passes through zero force. Plane sections remain plane is in effect through ALL stages of the analy...

I developed a new concrete model for OpenSees based on Chang and Mander's 1994 concrete model. I gave the model out to some people at the NEES Annual Meeting, and it will be in the next release of OpenSees. If you are using this model please post in here or send me a PM with your name and email so I...

I updated the proc to read like this: proc procGetTperiod {Neigen {PrintScreen "off"}} { set fmt1 "Mode=%.1i: Tperiod=%.3f " set PI [expr 2*asin(1.0)]; # define constants set iTperiod "" set lambdaN [eigen $Neigen] for {set i 1} {$i <= $Neigen} {incr i 1} {; # zero to o...

Boris, you are right if the wall's height to length ratio are low you shouldn't use a beam element. However, if you are looking at a system where the main lateral resistance is the wall, then I wouldargue that if the wall is four stories tall then the h/l is probably > 3, then it will be flexure dom...

I have tried editing the script you gave me to find the period so it reads as following: proc procGetTperiod {Neigen {PrintScreen "off"}} { set fmt1 "Mode=%.1i: Tperiod=%.3f " set PI [expr 2*asin(1.0)]; # define constants set iTperiod "" set lambdaN [eigen $Neigen] for ...

I still get:

Node::getEigenvectors<> = eigenvectors have not been set.

What is going wrong?

Yes, that is the only DOF with Masses associated with it.