Search found 3033 matches

by vesna
Mon Feb 24, 2014 9:47 am
Forum: OpenSees.exe Users
Topic: FBE with uniaxial sections and asymmetric hysteretic curve
Replies: 7
Views: 3827

Re: FBE with uniaxial sections and asymmetric hysteretic cur

The sign of the moment depends on orientation of local z axis, not on local x.
by vesna
Sun Feb 23, 2014 6:57 pm
Forum: OpenSees.exe Users
Topic: FBE with uniaxial sections and asymmetric hysteretic curve
Replies: 7
Views: 3827

Re: FBE with uniaxial sections and asymmetric hysteretic cur

I just want to add a comment on sign for the moment in a cross section. It depends on the local coordinate system that you set for your section. If local y is pointing up and local z to the left, positive moment will put bottom of the section in tension. However, if local y is pointing down and loca...
by vesna
Fri Feb 21, 2014 9:20 am
Forum: OpenSees.exe Users
Topic: SDOF modeling
Replies: 1
Views: 532

Re: SDOF modeling

You can use zeroLength element and assign to it a uniaxial material that is representative of behavior that you are trying to model. If you want your element to fail at ductility level of 3, MinMax material will do it.
by vesna
Wed Dec 18, 2013 9:36 am
Forum: OpenSees.exe Users
Topic: The location of plastic hinges
Replies: 13
Views: 4997

Re: The location of plastic hinges

Ella, You need to record the curvature at two integration points that approximately encompass the plastic hinge region, not the first and the last integration point of the beam. Ameri, You need to calculate rotation at yielding for each plastic hinge and use it as a trigger to trace plastic deformat...
by vesna
Mon Dec 16, 2013 10:01 am
Forum: OpenSees.exe Users
Topic: Error in absolute acceleration record
Replies: 6
Views: 1629

Re: Error in absolute acceleration record

When using timeSeries you need to specify timeSeries tag:
timeSeries Path 10 -dt $dt -filePath $GMfile -factor [expr $Scalefact*$g];

After that define the recorder and the load pattern.

Here is an example of the recorder:
recorder Node -file dataDir/Accel_S1.out -timeSeries 10 -node 11 -dof 1 accel;
by vesna
Mon Dec 16, 2013 9:51 am
Forum: OpenSees.exe Users
Topic: when leaning column is necessary?
Replies: 3
Views: 1145

Re: when leaning column is necessary?

Leaning column can be added to the 2D model of a frame to capture the effect that the gravity system has on lateral-load resisting frame. It does not matter if the frame is peripheral or middle.
by vesna
Mon Dec 16, 2013 9:47 am
Forum: OpenSees.exe Users
Topic: The location of plastic hinges
Replies: 13
Views: 4997

Re: The location of plastic hinges

I am not familiar with FEMA acceptance criteria and can not comment on that one. basicDeforamtion and ChordDeformation create the same output and are better option than plasticDeformation or plasticRotation. Several users reported problems with plasticDeformation recorder. However, I think that the ...
by vesna
Fri Dec 13, 2013 9:30 am
Forum: OpenSees.exe Users
Topic: The location of plastic hinges
Replies: 13
Views: 4997

Re: The location of plastic hinges

you will need to write a script that will do it for you. You basically need to record curvature at two integration points that encompass the plastic hinge region. Using this curvatures you can calculate plastic hinge rotations. Plot them as a function of time for plastic hinges. Calculate rotation a...
by vesna
Thu Dec 12, 2013 9:24 am
Forum: OpenSees.exe Users
Topic: The location of plastic hinges
Replies: 13
Views: 4997

Re: The location of plastic hinges

How did you model beam and column elements?
by vesna
Thu Dec 12, 2013 9:23 am
Forum: OpenSees.exe Users
Topic: Error in absolute acceleration record
Replies: 6
Views: 1629

Re: Error in absolute acceleration record

Would you post your recorder so we can test it.
by vesna
Mon Sep 16, 2013 12:16 pm
Forum: OpenSees.exe Users
Topic: modeling viscouz damper
Replies: 3
Views: 1544

Re: modeling viscouz damper

Can you try zeroLenght element with Maxwell material?
by vesna
Mon Sep 16, 2013 12:05 pm
Forum: OpenSees.exe Users
Topic: confinedconcrete01
Replies: 1
Views: 495

Re: confinedconcrete01

Try to contact the developer of the material directly.
by vesna
Mon Sep 16, 2013 12:04 pm
Forum: OpenSees.exe Users
Topic: Why there are initial moment and shear forces?
Replies: 4
Views: 791

Re: Why there are initial moment and shear forces?

Could you please reformulate your question. It is hard to understand.
by vesna
Mon Sep 09, 2013 11:49 am
Forum: OpenSees.exe Users
Topic: hysteretic material
Replies: 5
Views: 873

Re: hysteretic material

Unfortunately, there is no reference for hysteretic material. Professor Filippou, who is the developer of the material, never wrote a paper about it. The OpenSees source code is the only place where you can find the equations you are looking for.
by vesna
Mon Sep 09, 2013 11:41 am
Forum: OpenSees.exe Users
Topic: analyze failed
Replies: 4
Views: 1069

Re: analyze failed

Can you post the full message that you get from OpenSees?