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Hi
I modeled LRB isolator and then checked the eigen in 2d frame but the result was negative and the opensees couldnt calculate the period
how can i solve this problem ? pleas guide me dear teachers and students

This material ( kikuchi bearing element) model produces high damping rubber bearings
so if i want to model LRB i should use leadrubberX elements? i couldnt find this order for 2D model .
how can i use it for 2D model ?
and How about isolator2spring ? is it correct for modeling LRB?

Hi every body
any body knows how can i model Isolator like LRB in 2D steel frame?
should i use Isolator2 spring order ?
is there any example for this purpose ? i need to model isolator in opensees but i dont have any good sources and example
PLZ help me dear teachers and students

thanks for your attention Mr
i could find my answer

Hi pleas help me dear users i made a 2d steel frame model in opensees and now i want to start static analysis after loading a gravity loads. but there is not any difference between periods before and after gravity loads ! ! how should i INTRODUCTION gravity loads. i use this order for loading like t...