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Why are you using fibres then? You could use a lumped plasticity model with the constitutive model of the hinges equal to the elastic perfectly plastic behaviour that you want

I have a Matlab-based function that can be used to plot OpenSees models. I have used this to plot models as I build them and check for any errors. It can also plot mode shapes of structures using the modal analysis output from the TCL procedure also provided. It can be downloaded from here: https://...

When using the nodeAccel command, is it possible to get the total acceleration of the node and not just the relative acceleration? I understand why it comes out this way, but relative acceleration is of little use to me. Otherwise, is it possible to get the current input acceleration in the analysis...

Sounds like it may be the last one, I have the following type loop set up for i from 1 to # of ground motions open a text file for ground motion i to print scale factors to for j from 1 to # of scale factors do some stuff to determine an appropriate scale factor print the current scale factor to tex...

Hi Frank, Yes I have forceBeamColumn elements in the model. Yes, but if I close the program and run that specific intensity again it has no problems whatsoever. For example, I closed OpenSees, rebooted the PC and started the analysis again and it has gotten past the last point where it got caught wi...

I have a relatively simple model and I am running a parametric study on it with a number of ground motions, so i have a simple for loop type analysis set up. There is no problem running the model in pushovers or dynamic analysis, but sometimes when i start the loop, the analysis seems to freeze at a...

Thanks Frank. Yeah it is 20, the output is below. Looks like the aggregated shear hinge produces an extra gammaY output. <ElementOutput eleType="ForceBeamColumn3d" eleTag="1" node1="1" node2="2"> <GaussPointOutput number="1" eta="0"> <Secti...

If its any help, I posted a simple script a while back to do something like this for the Hysteretic material. Its nothing amazing but can save you a few minutes

http://opensees.berkeley.edu/community/ ... =2&t=62229

Ok at the first if statement for the lateral analysis you switch the algorithm and execute another analysis step. Then you switch the test and algorithm back to the original. But for the test, you have: test $TestType $Tol $maxNumIter 0 when the variable "$TestType" hasn't been previously ...

Well if you want to use a fibre element, then the degradation will need to come from your definition of the materials of the fibre section. Since you are using Steel02 this could be difficult since Steel02 doesn't have an ultimate strain or some fracturing in it. In theory, it will keep going foreve...

It depends how you are modelling it, what elements are you using? what material model are you using? If you are using a lumped plasticity, I would suggest having a look at the Ibarra Medina Krawinkler material models. There is a PEER report by Haselton et al. that talks about calibration of RC eleme...

If I was you I wouldn't wait on this material to be added to be honest, unless you have been told by someone that it is being added. Otherwise, you could code it and add it yourself!

Andrea, I had the same question a while back. If you mean the pinching terms, they are pretty easy to figure out if you just play around with a single spring and change the terms ( what i did). But for the degradation terms, well, all the best with that because its not exactly to figure and the only...

You will need to post the analysis part of your code before anyone can really help you. But from what you have written it looks like you have a condition to switch to the "Newton -initial" algorithm if the Newton Raphson one fails. But it looks like you didn't define a convergence test typ...

This will be a relatively simple answer for those who know, but could someone write down what the output from the section deformation recorder of a lumped plasticity forcebeam column element. This is, my element is: element forceBeamColumn $eTag $i $j $GT "HingeRadau $phTag1 $Lp $phTag2 $Lp $in...