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Hello, I am modelling a steel frame with TMD. I am trying to assign Rayleigh Damping only to the structure and not to the TMD. We know that adding TMD changes the periods of vibration. Is this correct that we first write main structure modeling commands in opensees file, then assign rayleigh damping...

Many many thanks

Hi I want to use Modified Ibarra-Medina-Krawinkler Deterioration Model for concentrated hinges in my steel frame model. I am using parameters introduced by the provided reference database by http://dimitrios-lignos.research.mcgill.ca/databases/ and parameters are defined in the paper: Deterioration ...

Hi I have a very simple 2D elastic steel frame. I modeled it with "dispBeamColumn" elements with elastic sections to record forces (moments) in various sections along beams. I wonder why the moment data for i node of the element recorded by: recorder Element -file $dataDir/Fbeam212.txt -ti...

Hi I want to record a node acceleration under an earthquake timeseries excitation. I have timeseries & it is not a multi-support case! in last paragraph of this reference it said that: "For a UniformExcitation analysis, this command generates output file nodesA.out that contains absolute ac...

Thanks a lot for your informative answer dear fmk.

Hi, I am trying to create a model of steel frame with concentrated hinges like the example http://opensees.berkeley.edu/wiki/index.php/Pushover_and_Dynamic_Analyses_of_2-Story_Moment_Frame_with_Panel_Zones_and_RBS by Laura Eads. I want to know why she has used a leaning column to simulate P-Delta ef...

I use following commands to record the rotation of plastic hing of a beamwithhinges element as mentioned in manual, but none of them record anything. Only an empty file with time!!! element beamWithHinges 221 21 22 $BeamSecTag 0.5 $BeamSecTag 0.5 $Es 0.00973 0.00013670 $IDBeamTransf; recorder Elemen...

Hi Dr.silvia Thanx a lot for your help. I've better to use beamwithhinges element or nonlinearBeamColumn elements for plastic rotation record? and what is the hinge rotation recorded by element recorder, total rotation or plastic rotation? if total how should I calculate the max elastic rotation and...

Dear Mr.Ayman I need some help, I'm doing a job like what you have done, a 2D model with fiber sections, I want to know how can I record the curvature of elements at various sections. In the order you have used I can't understand what is being recorded. "Recorder Element -file elem2.out -ele 2 ...

Hi Silvia,
Thank you for help,
but I don't know how to record the curvature of the element in a fiber section and how to get plastic hinge length.

thanks,

Hi Silvia, how can I get [b]max plastic rotation[/b] of a steel beam element in a fiber section, I'm using InelasticFiberWSection and nonlinearBeamColumn elements in my model as used in "Ex5.Frame2D.build.InelasticFiberWSection.tcl" I need it to check the ASCE code acceptance criteria. tha...