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I am not sure what is your question. Can you describe it in more detail?

if you record them in -xml format you will get info that you are looking for.

Most probably you have an error in your model as you could not go even through 1 step of analysis. Do eigen analysis to verify your model.

corotational is more appropriate for brace modeling in case you want to capture buckling of the brace.

if in 2D you do not need to specify the vector.

To me it looks like you need to develop a new element in OpenSees that will define the interface between the column and the footing. Force-based element uses Euler-Bernoulli rule and may not be applicable to your problem.

It depentds on what you are trying to achieve with your material model.

Here you can find few examples of how damage2 parameter changes the response:http://opensees.berkeley.edu/OpenSees/m ... l/4052.htm

fy is a material property. you should check the list of materials that are included in the sensitivity analysis to see if the material you plan to use (whose fy you want to alter) is included.

What does {*} stand for? I could not find it in tcl.

why don't you use zero-length element to model the gap.

There is nothing special about output of zeroLength elements.

If you are getting blank file it is either recorder definition that is wrong or it is the model that is wrong so the analysis can not be performed.

You can use beam column element but there are some tweaks you'll have to do. Check out presentation by Prof. Lowes from OpenSees Days 2012: http://opensees.berkeley.edu/wiki/index ... esDays2012

Sectional deformations are axial strain and curvature.

you can try out this material: http://opensees.berkeley.edu/wiki/index ... p_Material

If you look at the manual you will see that to define force-based element you can use "forceBeamColumn" or "nonlinearBeamColumn".

To model the viscous damper you can use zeroLength element and assign Maxwell material to it: http://opensees.berkeley.edu/wiki/index ... l_Material