APDL Programming buckling FEA C Section Cold Formed Steel

In summary: SectionIn summary, the conversation was about a program for a masters project involving a C160T2B70-1L cold formed steel section. The person was having issues with their program and was discussing how to connect filleted surfaces using a weld or load/stress transfer connection. They also mentioned various commands and techniques they were using in their program, such as local coordinates and element type selection. The conversation also touched on stress and buckling analysis.
  • #1
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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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  • #2

1. What is APDL programming and how is it used in buckling FEA for C section cold formed steel?

APDL (ANSYS Parametric Design Language) programming is a scripting language used in the ANSYS software to automate and customize finite element analysis (FEA) processes. In buckling FEA for C section cold formed steel, APDL programming is used to define the geometry, material properties, and boundary conditions of the structure, as well as to perform the necessary calculations and obtain the buckling results.

2. What is buckling and why is it important in the structural analysis of C section cold formed steel?

Buckling is a phenomenon where a slender structure, such as a C section cold formed steel member, fails due to compressive forces exceeding its critical load. It is important in structural analysis because buckling can lead to catastrophic failure of the structure, and therefore, it is necessary to determine the buckling load and corresponding mode of failure to ensure the safety and stability of the structure.

3. How does FEA help in predicting the buckling behavior of C section cold formed steel?

FEA (Finite Element Analysis) is a numerical method for solving structural problems by dividing the structure into smaller elements and analyzing them individually. In the case of C section cold formed steel, FEA can help in predicting the buckling behavior by simulating the compressive load and boundary conditions on the structure and calculating the critical buckling load and corresponding mode of failure.

4. What are the common challenges in performing buckling FEA for C section cold formed steel?

Some common challenges in performing buckling FEA for C section cold formed steel include accurate modeling of the geometry and material properties, selection of appropriate boundary conditions, and determination of the critical buckling load and mode of failure. Additionally, the convergence of the FEA solution can also be a challenge and may require multiple iterations to obtain accurate results.

5. How can the results of buckling FEA for C section cold formed steel be used in the design process?

The results of buckling FEA for C section cold formed steel can be used to optimize the structural design by determining the critical buckling load and mode of failure. This information can then be used to select appropriate member sizes, material properties, and boundary conditions that will ensure the safety and stability of the structure. Additionally, the results can also be used to verify the design against industry standards and codes.

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