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for now, just define a flexural hinge with very very low flexibility.
i have not, yet, implemented a pin.

and what have you found when using it?

try the self-centering material with a beta of zero -- that makes it act like a nonlinear elastic material.

you can do it if you go into the code.
in tcl, you have to just do it as many elements.

i have asked Frank to post it on the server asap.

you can put elements in series (share one node, have the same force and the displacements/flexibilities add up) or in parallel (share two nodes, have the same displacements and the forces/stiffnesses add up).

did you do a wipe after each analysis?

yes, i'm still working on BuildingTcl...

yes, i am no longer with OpenSees, but it's fun to visit!

yes, just take what you have in the examples and extend it to 3d

it's on the new NEEShub..

they shut NEESforge down on us without warning. i'll look into it.
right now you can run it on NEEShub.

find out which command causes the crash.
i'm guessing you are assigning a load to an element that has not been defined.

if you want the periods only, they are given to you when each analysis is executed, after gravity (so you can define a gravity-analysis only). they are given on the dos screen.

still, great idea!

i create my model data from the beginning and use it to create the opensees model and the post-processing.