3D nonlinear models using Concentrated Springs

[salarmanie]

Is there any useful script for 3d modeling of RC frames using concentrated plastic springs and utilizing uniaxial material models ... I have made one, using the Ibarra-Krawinkler model and it crashes ...
These are some of the commands I used to make a nonlinear spring concentrated at the end of beams:

uniaxialMaterial Elastic 444 23979157
uniaxialMaterial Bilin 777 $Ksz_beam1_z $b $b $Mybeam1_zdir [expr $Mybeam1_zdir] $LS $LK $LA $LD $cS $cK $cA $cD $th_pP $th_pN $th_pcP $th_pcN $ResP $ResN $th_uP $th_uN $DP $DN;
element zeroLength 61321326 132 1326 -mat 444 444 444 444 444 777 -dir 1 2 3 4 5 6 -orient 0 0 -1 0 1 0

and

element zeroLength 624 2427 242 -mat 777 777 -dir 5 6 -orient 0 0 -1 0 1 0
equalDOF 2427 242 1 2 3 4

... both crashes ! the 2D model works excellent ... the 3D one not .... Why?

[vesna]

Both spring definitions should work well. Something else is causing the problem. What do you mean by model crashes?