APDL Programming buckling FEA C Section Cold Formed Steel

AI Thread Summary
The discussion focuses on issues related to programming buckling finite element analysis (FEA) for cold-formed steel C sections as part of a master's project. The user seeks guidance on connecting filleted surfaces through welding or load/stress transfer connections. They provide a detailed code snippet outlining the setup for the FEA, including material properties, element types, and boundary conditions. The conversation emphasizes the importance of correctly defining connections and constraints in the modeling process. Overall, the thread highlights challenges in FEA programming specific to cold-formed steel applications.
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Hi,

I am facing issues with my program. Listed below. This is form my masters project. Also in what way can I connect the filleted surfaces shown in fig by a weld or just load or stress transfer connection.
Code: 
fini
/clear

/title,C160T2B70-1L

/prep7

et,1,shell181
r,1,2
mp,ex,1,1.85e5
mp,nuxy,1,0.3

type,1
mat,1
real,1

k,1,69,19,0
k,2,69,0,0
k,3,0,0,0
k,4,0,159,0
k,5,69,159,0
k,6,69,139,0
k,7,0,0,2500

k,8,71,19,0
k,9,71,0,0
k,10,139,0,0
k,11,139,159,0
k,12,71,159,0
k,13,71,139,0
k,14,139,0,2500

l,1,2
l,2,3
l,3,4
l,4,5
l,5,6
l,3,7

l,8,9
l,9,10
l,10,11
l,11,12
l,12,13
l,10,14

adrag,1,2,3,4,5,,6,,,,,,

adrag,7,8,9,10,11,,12,,,,,,

afillt,1,2,4
afillt,13,3,4
afillt,14,4,4
afillt,15,5,4
afillt,6,7,4
afillt,17,8,4
afillt,18,9,4
afillt,19,10,4

local,11,1,0,19.5,20,,,90
k,57,5,0
k,58,5,90
k,59,5,180
k,60,5,270
a,57,58,59,60
asba,3,10local,12,1,0,138.5,20,,,90
k,61,5,0
k,62,5,90
k,63,5,180
k,64,5,270
a,61,62,63,64
asba,19,3

local,13,1,0,138.5,2480,,,90
k,65,5,0
k,66,5,90
k,67,5,180
k,68,5,270
a,65,66,67,68
asba,10,3

local,14,1,0,19.5,2480,,,90
k,69,5,0
k,70,5,90
k,71,5,180
k,72,5,270
a,69,70,71,72
asba,19,3

local,15,1,139,19.5,20,,,90
k,73,5,0
k,74,5,90
k,75,5,180
k,76,5,270
a,73,74,75,76
asba,8,3

local,16,1,139,138.5,20,,,90
k,77,5,0
k,78,5,90
k,79,5,180
k,80,5,270
a,77,78,79,80
asba,19,3

local,17,1,139,138.5,2480,,,90
k,81,5,0
k,82,5,90
k,83,5,180
k,84,5,270
a,81,82,83,84
asba,8,3

local,18,1,139,19.5,2480,,,90
k,85,5,0
k,86,5,90
k,87,5,180
k,88,5,270
a,85,86,87,88
asba,19,3

csys,0

esize,5
amesh,all,,,
allsel

lsel,s,,,11
lsel,a,,,19
lsel,a,,,20
lsel,a,,,21
nsll,s,1
d,all,all,0

lsel,s,,,22
lsel,a,,,24
lsel,a,,,26
lsel,a,,,27
nsll,s,1
d,all,all,0

lsel,s,,,28
lsel,a,,,30
lsel,a,,,32
lsel,a,,,33
nsll,s,1
d,all,all,0

lsel,s,,,67
lsel,a,,,68
lsel,a,,,70
lsel,a,,,71
nsll,s,1
d,all,all,0lsel,s,,,79
lsel,a,,,80
lsel,a,,,81
lsel,a,,,82
nsll,s,1
d,all,all,0

lsel,s,,,75
lsel,a,,,76
lsel,a,,,77
lsel,a,,,78
nsll,s,1
d,all,all,0

lsel,s,,,83
lsel,a,,,84
lsel,a,,,85
lsel,a,,,86
nsll,s,1
d,all,all,0

lsel,s,,,87
lsel,a,,,88
lsel,a,,,89
lsel,a,,,90
nsll,s,1
d,all,all,0
nsel,s,loc,x,4,64
nsel,r,loc,y,0,0
nplot
nsel,r,loc,z,0,50
cm,N1,node
cmsel,s,N1
d,all,uy,0
allsel

nsel,s,loc,x,4,64
nsel,r,loc,y,0,0
nplot
nsel,r,loc,z,2450,2500
cm,N2,node
cmsel,s,N2
d,all,uy,0
allsel

nsel,s,loc,x,0,0
nsel,r,loc,y,0,158
nplot
nsel,r,loc,z,0,50
cm,N3,node
cmsel,s,N3
d,all,ux,0
allsel

nsel,s,loc,x,0,0
nsel,r,loc,y,0,158
nplot
nsel,r,loc,z,2450,2500
cm,N4,node
cmsel,s,N4
d,all,ux,0
allsel

nsel,s,loc,x,0,0
nsel,r,loc,y,0,158
nplot
nsel,r,loc,z,0,50
cm,N5,node
cmsel,s,N5
d,all,uY,0
allsel

nsel,s,loc,x,0,0
nsel,r,loc,y,0,158
nplot
nsel,r,loc,z,2450,2500
cm,N6,node
cmsel,s,N6
d,all,uY,0
allsel

nsel,s,loc,x,4,64
nsel,r,loc,y,158,158
nplot
nsel,r,loc,z,849,851
cm,N7,node
cmsel,s,N7,node
f,N7,fy,-0.01925
allsel

nsel,s,loc,x,4,64
nsel,r,loc,y,158,158
nplot
nsel,r,loc,z,1649,1651
cm,N8,node
cmsel,s,N8,node
f,N8,fy,-0.01925
allsel

nsel,s,loc,x,74,136
nsel,r,loc,y,0,0
nplot
nsel,r,loc,z,0,50
cm,N9,node
cmsel,s,N9
d,all,uy,0
allsel

nsel,s,loc,x,74,136
nsel,r,loc,y,0,0
nplot
nsel,r,loc,z,2450,2500
cm,N10,node
cmsel,s,N10
d,all,uy,0
allsel

nsel,s,loc,x,139,139
nsel,r,loc,y,0,158
nplot
nsel,r,loc,z,0,50
cm,N11,node
cmsel,s,N11
d,all,ux,0
allsel

nsel,s,loc,x,139,139
nsel,r,loc,y,0,158
nplot
nsel,r,loc,z,2450,2500
cm,N12,node
cmsel,s,N12
d,all,ux,0
allselnsel,s,loc,x,139,139
nsel,r,loc,y,0,158
nplot
nsel,r,loc,z,0,50
cm,N13,node
cmsel,s,N13
d,all,uY,0
allsel

nsel,s,loc,x,139,139
nsel,r,loc,y,0,158
nplot
nsel,r,loc,z,2450,2500
cm,N14,node
cmsel,s,N14
d,all,uY,0
allsel

nsel,s,loc,x,74,136
nsel,r,loc,y,158,158
nplot
nsel,r,loc,z,849,851
cm,N15,node
cmsel,s,N15,node
f,N7,fy,-0.01925
allsel

nsel,s,loc,x,74,136
nsel,r,loc,y,158,158
nplot
nsel,r,loc,z,1649,1651
cm,N16,node
cmsel,s,N16,node
f,N8,fy,-0.01925
allsel
/SOLU
PSTRES,ON
SOLVE
FINISH

/SOLU
ANTYPE,BUCKLE
OUTRES,ALL,ALL
BUCOPT,LANB,30
SOLVE
FINISH

/SOLU
EXPASS,ON
MXPAND,30,,,YES
OUTRES,ALL,ALL
SOLVE
FINISH

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