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Hi fmk,

How about the moment positive directions at element ends?

Best,
Tim

fmk wrote:
> yes.

Thanks so much Frank, I got results but definitely they are not correct. I changed the values of damping coefficients but the results did not change accordingly... We have a bunch of nonlinear springs to model the behavior of abutment components such as foundations, shear keys, bearings, deck poundi...

Hi All,

Is there a way in OpenSees to connect a linear dashpot with a nonlinear spring in series? I have tried to assign two elements for each of these two materials and connect them in series. However, the results seems not correct to me. Any ideas?

Thanks,
Yazhou

In the case with asymmetric material (i.e., the tension and compression sides have different backbone curves), does the node order (i.e., the ith and jth node) matter in the definition of zero-length element? If so, what is the basic rule?

Thanks in advance,
Yazhou

Dear all,

I am using the py spring material that I found is much more convenient to call using the version 2.2.0. Would it be possible that anyone can send me this version (64 bit) to yxie@rice.edu? Thanks!

Hi Fmk,

I am using the py spring material that I found is much more convenient to call using this version. Would it be possible that you can send me this version with 64 bit to yxie@rice.edu? Thanks!

Hi All, I conducted a free vibration analysis of a rocking column with no damping included, geometric nonlinearity is modeled as corotational transformation and corotational truss elements at rocking supports. Newmark method is used as the integrator. However, the amplitude of the free vibration dif...

Hi all, I was trying to model the behavior of a free standing rectangular rocking block with a concentrated mass. Since rocking is equilibriumed in the rotational direction, the determination of the rotational mass is critical. I wonder how OpenSees considers this, which value should I use for the r...

Thanks Frank, I tried the corotation truss element and it works!

Hi All, I am trying to model the rocking column on rigid base using compression only materials at the rocking interface, I used zero length elements with ElasticPP spring material in the vertical direction. While since it is a large deformation problem, the spring response was not correct. So is the...

Hi Everyone! I am using UiSimCor to connect OpenSees for my hybrid simulations for a bridge including SSI. At each time step UiSimCor just read the restoring force from OpenSees and input the forces to my condensed hybrid model. And I have to compose a damping matrix for my UiSimCor model separately...