Search found 217 matches

by STKO Team
Mon Sep 14, 2020 8:39 am
Forum: Analysis
Topic: Time History Analysis(plastic model vs elastic model)
Replies: 12
Views: 309

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

1. What does "ETABS do not plot full rotation" mean? Do you mean ETABS present only the plastic part? Because the initial stiffness is so high. It can't present the elastic part due to x-axis scale(the elastic rotation is too small). Is it right? If you look at the figure you posted of the ETABS hi...
by STKO Team
Thu Sep 10, 2020 5:04 pm
Forum: Analysis
Topic: Time History Analysis(plastic model vs elastic model)
Replies: 12
Views: 309

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

1. Sorry, I don't fully understand the first paragraph. What dose "the beam is taking all the rotation" mean ? I also confuse that the moment in the beam is correct and it is not in equilibrium with the momemnt on the zerolength. The zero-length elements and the beam are connected in series. For eq...
by STKO Team
Thu Sep 10, 2020 11:06 am
Forum: OpenSees Sequential
Topic: hdf5 not found
Replies: 2
Views: 100

Re: hdf5 not found

You need to copy the following DLLs in the directory where you have opensees.exe (you can find them in the STKO install directory):
  • hdf5.dll
  • szip.dll
  • zlib.dll
If you already did it, can you show me a screenshot of your OpenSees directory and the way you call it
by STKO Team
Tue Sep 08, 2020 3:51 pm
Forum: Analysis
Topic: Time History Analysis(plastic model vs elastic model)
Replies: 12
Views: 309

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

If Base shear multiplied by H(The height of the column) equals moment. Why the value of the moment is smaller than the base shear? Yes here you should have that RMy = L/2 * RFx. But you don't. This happens because the the beam is taking all the rotation while the zerolength takes almost nothing. In...
by STKO Team
Tue Sep 08, 2020 8:34 am
Forum: Analysis
Topic: Time History Analysis(plastic model vs elastic model)
Replies: 12
Views: 309

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

Furthermore, I also check base shear in STKO, and I find the maximum is about 100000N. The moment of the column should reach yield moment, but why the plastic hinges still remain elastic? I had a look at the absolute maximum of reaction force along the X direction and it reaches about 90000N. The r...
by STKO Team
Mon Sep 07, 2020 9:19 am
Forum: Post processing and data visualization
Topic: Missing elements in post-prossesor
Replies: 2
Views: 109

Re: Missing elements in post-prossesor

I see the beams:
iseethem.png
iseethem.png (571.24 KiB) Viewed 95 times
Probably I did not understand what is that you cannot see
by STKO Team
Mon Sep 07, 2020 9:09 am
Forum: Post processing and data visualization
Topic: Manually record fiber element
Replies: 1
Views: 58

Re: Manually record fiber element

STKO does not change the commands you can use in OpenSees. By the way, STKO uses a 0-based indexing for gauss points and fibers, while OpenSees uses a 1-based indexing for gauss points and 0-based for fibers. So in your case it should be: recorder Element -file Fuse.out -time -dT -ele 17 section 6 f...
by STKO Team
Mon Sep 07, 2020 9:00 am
Forum: Analysis
Topic: Time History Analysis(plastic model vs elastic model)
Replies: 12
Views: 309

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: 165

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: 165

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...