Search found 222 matches

by STKO Team
Thu Oct 01, 2020 7:54 am
Forum: OpenSees Sequential
Topic: Question about Modal analysis and Modal Participating Mass Ratios
Replies: 1
Views: 20

Re: Question about Modal analysis and Modal Participating Mass Ratios

After I check the result, the result of the third mode (torsional mode)in ETABS is different from the one in STKO. You are right. Right now, the script you are using is simplified, and considers (for rotational partiticipation factors) only the direct rotational masses (if applied) and not the effe...
by STKO Team
Wed Sep 30, 2020 5:51 pm
Forum: Analysis
Topic: Two story frame analysis(convergence problem)
Replies: 1
Views: 8

Re: Two story frame analysis(convergence problem)

I simply increased the maxDim of the Krylov-Newton to be equal to the maximum number of iterations. It means that the Krylov-Newton will update the tangent matrix only once for each step. Basically it seams that the tangent matrix is too unstable in this dynamic problem. I also increased the unifrom...
by STKO Team
Mon Sep 28, 2020 10:13 am
Forum: Analysis
Topic: Local Variable "node" referenced before assignment
Replies: 1
Views: 22

Re: Local Variable "node" referenced before assignment

Dear User,
the Selection Set for the control node was empty.
You need to add a vertex to that selection set, otherwise the DisplacementControl method will not find the control node.
Senza nome.png
Senza nome.png (464.82 KiB) Viewed 11 times
Here is the fixed model
Bare Frame.zip
(164.51 KiB) Downloaded 1 time
by STKO Team
Mon Sep 28, 2020 10:05 am
Forum: Property
Topic: References for Masonry Units and mortar in micromodelling
Replies: 2
Views: 25

Re: References for Masonry Units and mortar in micromodelling

Have a look at one of my articles on the Tension-Compression damage model. At the time I wrote those articles, that material model was implemented in Kratos Multiphysics (not in OpenSees) but the parameters and the theory behind it are the same https://www.researchgate.net/publication/317068729_Micr...
by STKO Team
Mon Sep 28, 2020 10:02 am
Forum: Installation issues
Topic: OpenSeesMP.exe won't open
Replies: 2
Views: 24

Re: OpenSeesMP.exe won't open

Thanks vokumus for the reply. Probably you need to find on the web a detailed tutorial on how to completely un-install MPICH2 from your PC. Probably a simple un-install will not clear all the feature and registry changes the original installation did.
by STKO Team
Fri Sep 25, 2020 10:50 am
Forum: Geometry
Topic: BeamSectionproperty
Replies: 1
Views: 12

Re: BeamSectionproperty

Dear User,
That error appears only when you first create the beamSectionProperty, because by default the seciton is None (i.e. not chosen). And of course it cannot create the 3D visual extrusion. As soon as you select the fiber section that error will not appear anymore.
by STKO Team
Wed Sep 23, 2020 11:05 am
Forum: Property
Topic: Unreasonable Horizontal and Vertical Displacements
Replies: 5
Views: 202

Re: Unreasonable Horizontal and Vertical Displacements

If the rigid body displacement of the whole model is also included, is there a way I can set up the model so that the rigid body effect is taken away automatically? Not if we use LK absorbing boundaries... I thought I was supposed just use the acceleration time history as the input. When am I suppo...
by STKO Team
Mon Sep 21, 2020 5:39 pm
Forum: Property
Topic: Unreasonable Horizontal and Vertical Displacements
Replies: 5
Views: 202

Re: Unreasonable Horizontal and Vertical Displacements

I tried to have a look at your files. It seems correct. One reason may be that, since the bottom nodes are not fixed (they do not have a fixity + a uniformExcitation), but they have an equivalent stress boundary condition, the displacement that you see, also includes the rigid body displacement of t...
by STKO Team
Fri Sep 18, 2020 3:25 pm
Forum: Property
Topic: Unreasonable Horizontal and Vertical Displacements
Replies: 5
Views: 202

Re: Unreasonable Horizontal and Vertical Displacements

It looks like your selection set [4] "FF edof" was wrong: You included the edges of the FF and soil domain, but not the interaction. Instead that selection set should contain the interaction itself. Because in this way, when you add the analysis step "modelSubset", if your selection set does not con...
by STKO Team
Fri Sep 18, 2020 1:34 pm
Forum: Analysis
Topic: Time History Analysis(plastic model vs elastic model)
Replies: 12
Views: 373

Re: Time History Analysis(plastic model vs elastic model)

From your ETABS hinge plot, it looks like there is no cyclic deterioration