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Amplification of the structural response depends on the mass, stiffness, and the damping in the model. Please review them for their correctness, particularly the damping.


Dear Kesavan:

Thanks for your notice, but I double checked all properties and damping settings and found no errors. :( I ...

Dear STKO team:

I built a 5-story RC frame using STKO and performed a time history analysis on it. I input the seismic acceleration in three directions using UniformExcitation. Because the result of each node is the relative acceleration to the ground, I analyzed the absolute acceleration of the ...

Dear STKO team:

I have built a simple joint model containing pinching4 material, I did hysteretic analysis using dispBeamColumn element and forceBeamColumn element respectively. The other parameters are same, but the hysteresis curves and fiber strain are very different. What is the reason for the ...

The penalty factor isn't fixed. It depends on the specific situation, including the units you're using and the properties of the material you're analyzing. A good starting point is to use a value similar to what you set for the penalty constraint handler in your analysis settings.
Also, you ...

It's because if you use the RCJoint and the rigid diaphragm together, you cannot use the transformation handler!
You should go with penalty.

And also, the analysis to setup the eigen should not have the "wipeAnalysis" otherwise it will be useless


Dear STKO team:

Thanks very much for your help ...

Dear STKO team:

I built a 3D frame model and used 'RCJonitModel3D' in it, but when I did time history analysis I found that the structure didn't seem to be connected together properly and the mode of vibration were clearly wrong as shown in the picture. I've tried adjusting the K(penalty) value of ...

Hi, OpenSees follows a consistent unit system, which means you can use any unit system of your choice. However, it's important to note that all dimensions and material properties should be defined according to the chosen unit system. The results obtained will also be in the same unit system. As ...

Dear STKO team,
In the webinar about seismic isolation, the tutorial uses the unit system of m-kg-N. If the unit system of mm-t-N is used to input parameters in the ElastomericX element, can OpenSEES calculate the correct result?

All the best

Thank you so much for your assistance, I really appreciate it!

Hi, the displacement and reactions come from different nodes, you cann't use the same plot to extract them. So extract them separately and use spreadsheet to plot the curves. In other words, to extract RFy, select left and bottom nodes, and to extract Uy, use only the right node.
Alternatively ...