Learning Forum

[lbtung248]

Hello everyone,

I have a space truss model includes of multiple truss bars and these bars are connected to each other by spring element. I converted these springs from longitudinal springs to rotational COMBI250 springs by the following command:

etet,_sid,combi250

KEYOPT,_sid,1,0

K1=1e15

K2=1e15

K3=1e15

K4=ARG1

K5=ARG1

K6=ARG1

r,_sid,,,,,,,

RMORE,K1,K2,K3,K4,K5,K6

However there are 56 springs in total and copy paste these command snippets to each spring takes a lot of time and also when i want to change the value of the stiffness of the spring for the whole system, i have to go to every spring to adjust it.

Is there anyway i can use 1 command snippet to add these stiffness properties to all my 56 springs at once?

[Govindan Nagappan]

Yes, you can use one command object under the analysis branch (static, modal etc)
Sample commands:
/prep7
esel,s,enam,,250 !Select all 250 elements
*get,eltype_max,etyp,0,num,max !find max element type number used
et,eltype_max+1,250 !specify next element type as 250
emodif,all,type,eltype_max+1 !modify all selected elements to have type = eltype_max+1
!then define your stiffness values
KEYOPT,eltype_max+1 ,1,0
allsel
/solu

Check the feedback from solution information to verify this works. Check the command reference manual for details on the command