how to model rotational spring

[Muntasir]

I want to model a semi-rigid beam column joint from an experimental moment-rotation curve. the curve is a nonlinear one which gets back to origin upon load reversal(without any permanent deformation). How can i produce this behavior in seismostruct?

[ricardomonteiro]

Hi, Muntasir.

I was flicking through your query and I've never tried to do so, especially modelling a nonlinear curve which has no energy dissipation within load reversal.

I guess you can try to build a Nonlinear elastic curve - nlin_el, from the SStruct links elements, calibrating its four parameters to represent your curve as much as possible.

You could try as well to approximate your curve to a trilinear curve, and then use trl_sym link element, but then you would have a hysteretic behaviour...

Ricardo

[Muntasir]

Thanks Ricardo. Can you give me ur mail address so that i can send u my curve. I think that would help u to understand better.

regards

[ricardomonteiro]

Yes, sure, you can send me an e-mail by going to my profile page, here at the forum. There you can find a direct link.