Search found 220 matches

by STKO Team
Mon Sep 07, 2020 9:00 am
Forum: Analysis
Topic: Time History Analysis(plastic model vs elastic model)
Replies: 12
Views: 354

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

Dear user, probably the plastic hinge data in OpenSees do not coincide with the one in ETABS. In fact if you look at the moment-curvature (material.stress material.strain) of your plastic hinges, you will see that they remain elastic. They reach about 25000 N*m, while your yield moment is about 1100...
by STKO Team
Mon Sep 07, 2020 8:26 am
Forum: Analysis
Topic: Error in RC Frame Analysis (ZeroLength)
Replies: 7
Views: 191

Re: Error in RC Frame Analysis (ZeroLength)

Of course you can apply uniform distiributed loads on elastic beam columns using the lumped approach. Probably what they meant (wherever you read that sentence) is that, if your distributed load is so high that can lead to non-linearity in the middle of the element, of course you need distributed pl...
by STKO Team
Wed Sep 02, 2020 8:29 am
Forum: Analysis
Topic: Error in RC Frame Analysis (ZeroLength)
Replies: 7
Views: 191

Re: Error in RC Frame Analysis (ZeroLength)

1. Why you have assigned elasticBeamColumn element for all 4 Columns and ForceBeamColumn element for all 4 Beams ? Simply because in that webinar we wanted to show that you can use any kind of element as the inner element of the HingedBeam, both a fiber or an elastic beam. Of course in the practice...
by STKO Team
Tue Sep 01, 2020 7:57 am
Forum: Analysis
Topic: Error in RC Frame Analysis (ZeroLength)
Replies: 7
Views: 191

Re: Error in RC Frame Analysis (ZeroLength)

Dear user, That file was built and run with a previous version of OpenSees. Now we use OpenSees 3.2 so probably something has changed in the new OpenSees version. But I think it's only some convergence setting inside the force beam column, because just changing some settings in the pushover analysis...
by STKO Team
Tue Sep 01, 2020 7:31 am
Forum: Analysis
Topic: Pushover Analysis for a RC frame
Replies: 1
Views: 86

Re: Pushover Analysis for a RC frame

Of course you can, We gave a webinar exactly on that topic. Remeber to watch our previous webinars, and follow the upcoming ones here: https://asdeasoft.net/?stkowebinars-for-opensees Webinar #07 is exactly what you're looking for: Learning Opensees: Nonlinear Modeling of RC Frames (Lumped Plasticit...
by STKO Team
Mon Aug 31, 2020 5:53 pm
Forum: Analysis
Topic: PushOver
Replies: 2
Views: 167

Re: PushOver

Dear David, There were some mistakes that I corrected in the attached file: All your columns were compounds of a base node and a polyline, however the base node was detached from the corresponding polyline. I simple exploded them and removed the extra nodes. Your steel material had wrong parameters ...
by STKO Team
Mon Aug 31, 2020 5:11 pm
Forum: Analysis
Topic: Convergence Problem
Replies: 2
Views: 160

Re: Convergence Problem

Please attach your *.SCD file so that we can have a look. (zip it before attaching it)
by STKO Team
Mon Aug 31, 2020 5:10 pm
Forum: Property
Topic: High Displacements with Plastic Material Stage
Replies: 15
Views: 1902

Re: High Displacements with Plastic Material Stage

Dear Vokumus, We had a look at the file and you were right, we put slightly wrong values. I corrected them and I noticed that the response gived by using only elastic materials (i,.e. without switching to plastic) are acceptable but not very good. While in the plastic regine they are wrong. First of...
by STKO Team
Mon Aug 31, 2020 5:06 pm
Forum: Post processing and data visualization
Topic: Result of plastic hinges
Replies: 5
Views: 262

Re: Result of plastic hinges

Dear user, By default the zeroLength element (as any other "interaction" in STKO) uses the global axes, unless you assing a new user-defined localAxes to them. Then if you model your column drawing the zero-length elements manually, they will use (by default) the global axes, so the bending DOFs of ...
by STKO Team
Mon Aug 31, 2020 4:59 pm
Forum: Analysis
Topic: Acceleration records
Replies: 1
Views: 137

Re: Acceleration records

Dear Alok, STKO (as OpenSees)is unitless. You should take care of checking the unit-consistency of your data. There is no way I can verify that. If you want to output the drift, then probably I will look into the displacement field, not the strain field. If you want to analyze multiple ground motion...