The OpenSees Community

Dear Frank and Developers,
We do have methods to get Strain and StrainRate. I was wondering to know if there is a method to get the acceleration or the rate of StrainRate ?

Hello everyone, I am trying to add new material in opensees using MAC(Not windows or Linux). I was able to create .dylib and use the exampe1.tcl for ElasticPPcpp( everything works just fine). When I want to add my own code, I could create .dylib (my new material) successfully but when I use the .dyl...

Hello jiejingz,
If you are done with your code, Could you share that with us ?

Thanks for reply selimgunay
I did download all the source files but I don't where it is explained about set/get TriaStrain and strainreate !!
Can you help me by that ?

Hello everyone, I am trying to add new material following the steps in Frank's presentation. I could make .dll file successfully but when I run the example1.tcl I received the error "Warning could not create uniaxialMaterialElasticPPcpp". I get this error both in Mac and Windows. Can anyone help me ...

Hello Frank and other Developers, I'd like to know how OpenSees get the Strain or StrainRate from a element and pass it to a material ? My goal is to write a code in order to get the acceleration and pass it to a material but before that I need to know how OpenSees works for passing the Strain or St...

My question is if I can I do that ?
because in the note for Viscous material it is said that we cannot use Viscous material in series/parallel with other materials

Hello all,
I want to make a Kelvin element (spring and stiffness in parallel). Can anyone help me how I could do it ?
Can I simply use Elastic Uniaxial Material and Viscous Material in parallel ? or OpenSees ignores one of the material when I use them in parallel ?
Thank you

Thanks Selimgunay,
I have a question, If I use TMD, Elastic Uniaxial Material plus ZeroLength Element, will that work with relative acceleration ?
Thanks

Thanks for your response selimgunay,
could you give me a hint how I could do that ? Which element or material I could play with, modify it, in order to create an element working with its terminals acceleration ?
Thanks

What is the difference(s) between Viscous Material and viscousDamper Material ?

Hello, I wonder to know How to model a chevron frame with high stiffness ? I used code below but I keep receiving this error: node 1 0. 0. node 2 3. 0. node 3 1. 2. node 4 2. 2. fix 1 1 1 1 fix 2 1 1 1 . . . uniaxialMaterial Elastic 3 1e10 . . . element truss 4 1 3 0.5 100 element truss 5 3 4 0.5 10...

Is there any example to see how to use Viscous Material in Zero-length element ?
Thanks

Hello Developers, In order to model new type of dampers I need to define new material to work with relative acceleration. As far as I know, the built-in functions in OpenSees usually work with displacements and velocities at each step but I need a function which works with acceleration. I know I sho...

Hello programmers,
Can anyone tell me how I can link my c++ code to OpenSees ? I'm using Mac and I know I have to use .dylib file but I have no clue I should do that.

Thanks in advance.