The OpenSees Community

thanks a lot for your response. But, my main objective is modelling liquefaction in partially saturated sands. Which model and element would be most appropriate for this issue? If there is not any, how we can modify available models to achieve the partial saturation state?

Hi,
Would you please let me know if there is any model and element for partially saturated sands? I mean, is there any code that user can change degree of saturation?
Thanks

Hi
Would you please let me know if there is any code for liquefaction modeling in a sand layer?

Dear Silvia
Hi
I have used your command for generating Moment-Curvature relationship under cyclic loads for column sections. Do you have any idea about getting its stress-strain relationship in OpenSees? It would be appreciated if you help me with this...

Dear Vesna Hi I tried the command you have put for moment-curvature analysis of section -- cyclic. I have 2 questions. Would you please help me with them? 1) In unloading phase, the curve becomes linear. What can be the main reason? 2) How can I get hysteretic loops for moment-curvature? The command...

Hi dear vesna...

I did pushover analysis for my 3D model.In first few modes I got the results,but in 7th mode I have a problem.(my model is SAC9 with 27 modes).

WARNING:CTestNormDispIncr::test<>-failed to converge.

What is wrong with this model?

Hi dear vesna... I'd asked you a question about my model which has a rotational spring.The subject of that question was "rotational springs". As you advised me,I applied another ground motion to my model and changed Fy,b. Again,I found out that the results aren't being changed by changing ...

Hi dear vesna... I applied another earthquake record to my model.It gets to the inelastic range,but my problem isn't solved. :( I was wondering if you'd mind showing me a command which defines a rotational spring with its appropriate elastic and inelastic parameters. As you know,a rotational spring ...

Hi... This is my commands for defining a 2 degree of freedom system: # Set up--------------------------------------------------- wipe; # clear memory of all past model definitions set dataDir Data; # set up name of data directory file mkdir $dataDir; # create data directory set GMdir "../GMfile...

Hi dear vesna... I have defined a rotational spring by this command:(I have put appropriate values instead of each $) uniaxialMaterial Steel01 $matTag $Fy $E0 $b element zeroLength $eleTag $iNode $jNode -mat $matTag1 $matTag2 ... -dir $dir1 $dir2 ... equalDOF $nodeR $nodeC ... I applied a ground mot...

Hi dear vesna... I have 2 questions: 1)Is rigidLink command useful for defining rigid column and rigid beam? 2)I want to get the translational and rotational frequency of the structure.This is my primary command(for example) : . . . . mass 1 0.1 0.1 1000 0.1 120000 0.1 If I define this command: mass...

Hi dear... Is there any difference between 2D & 3D problems in the rotational springs modelling?If yes,: 1)Which command helps me define a rotational spring in 3D problem? My model has 2 rotational spring.One of them belongs to -dir5 and the other to -dir6 2)By which command,I can apply the rota...

Hi dear vesna... I want to get the base torque of structure.I've used this command: set basetorque "Data/base torque -node 1 2 3 4.txt" recorder Node -file $basetorque -time -node 1 2 3 4 -dof 5 reaction opensees output is: for example: -100 -200 -200 -100 so,the base torque=-100-200-200-1...

Hi dear vesna
I defined a stucture in opensees
is there any command which can help me find the modal parameters?
for example : modal mass matrix and modal stiffness matrix of the entire structure?
thanks alot

I want to get the rotation of the floor
is it be ok if I use this command ?: recorder Node -file $node rotation -time -nodes 1 -dof 5 disp
where tag 1 belongs to CM(center of mass) of the floor.
thanks alot