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In the wiki, optional inputs are bracketed like so: <-mass num num num> In your tcl file, you shouldn't include those <> brackets if you want to use that input flag. Just change your element to: element dispBeamColumn 1 1 2 $numIntgrPts $ColSecTag $ColTransfTag -mass $massDens $Negligible $Negligible;

Analyze Menu --> Write OpenSees Input Files If you look in the model directory, you will find that opensees navigator creates all the necessary tcl files to run the analysis. For example, if your model is saved in /mymodel , then navigator creates the subdirectories /mymodel/OutputFiles and /mymodel...

the norm unbalance test is being used.

Edit: also tried the norm disp increment, with no change to the results.

Hi Dr. Mckenna and others, I was wondering if anyone can think of a reason for spurious axial loads appearing in my shear wall results. I made a short image album summarizing these results and the problem here: http://imgur.com/a/UGWG1 Basically, I have modeled shear walls with ShellMITC4 elements a...

Hi all, I have some 3D tall building models, with masses applied to nodes at every floor level. I was having some difficulties with eigen analysis using the -genBandArpack option. Specifically, I was getting an error if I requested more then a few modes: ArpackSolver::Error with _saupd info = -9999 ...

Is there a reason why you don't want to use the rigidDiaphragm MPC? I mean, you could just restrain the out-of-plane directions. There's also a RigidLink MPC, but I haven't tried it. http://opensees.berkeley.edu/wiki/index.php/RigidDiaphragm_command http://opensees.berkeley.edu/wiki/index.php/RigidL...

You can look at all the element types here: http://opensees.berkeley.edu/wiki/index ... nt_Command

...and determine if it has the capabilities required for your application.

Sure. I made a wiki account with the same username: Jatkinson

I was perusing through the opensees source code and noticed that Dr. Schellenberg wrote an elasticTimoshenkoBeam element, which considers shear deformations... This would be the direct equivalent of a SAP2000/Etabs 'Frame' element, I think. Anyway, It seems to work fine, but there is no entry for it...

Although not exactly what you are looking for, there is some tensile test data for more conventional longitudinal steel bars at the following link. You could consider using this data to get a feel for what sort of values might be appropriate. http://nisee2.berkeley.edu/peer/prediction_contest/wp-con...

Hello, I am having trouble getting even a simple model of multi-layer shell elements to run smoothly in opensees in a pushover analysis. The program will always crash at the end of the analysis, but when I look at my data (using -closeonWrite in recorders to retain data despite crash) it seems that ...