Automatic Spring Elements Created

I am modelling HEB200 beam of length 4.8mm using Teddy. The code will be pasted below. The code works well without any error. I first created 2d cross section using points (spt) and then connected the points with lines (sln) and grouped it into a area using sar fields. Finally extrude it for 4.8m

My question:

  1. Why does sofistik create spring elements at the cross section created?
  2. Why is a way to extrude HEB cross section created using “Prop” syntax and mesh the structure with Bric Volumn element?

The code is as follows:

+PROG AQUA URS:2
head material definition
norm din 1045-1
CONC NO 2 TYPE C FCN “30” TITL “C 30/37 (EN 1992)”
$STEE NO 2 TYPE B CLAS “500B” TITL “B 500B (EN 1992)”
$prof
end

+prog sofimshc urs:1
head Sectional quad mesh
syst 3D gdir negz gdiv 100000
ctrl mesh 0.5
ctrl hmin 0.05[m]
ctrl DELN 0 $ no deletion of auxiliary structural line
echo full val extr
ctrl

$ structural points — now in YZ plane (X=0)
spt 1 0 -0.1 -0.1
spt 2 0 0.1 -0.1
spt 3 0 0.1 -0.085
spt 4 0 0.0045 -0.085
spt 5 0 0.0045 0.085
spt 6 0 0.1 0.085
spt 7 0 0.1 0.1
spt 8 0 -0.1 0.1
spt 9 0 -0.1 0.085
spt 10 0 -0.0045 0.085
spt 11 0 -0.0045 -0.085
spt 12 0 -0.1 -0.085

$ structural lines
sln 1 npa 1 2
sln 2 npa 2 3
sln 3 npa 3 4
sln 4 npa 4 5
sln 5 npa 5 6
sln 6 npa 6 7
sln 7 npa 7 8
sln 8 npa 8 9
sln 9 npa 9 10
sln 10 npa 10 11
sln 11 npa 11 12
sln 12 npa 12 1

!*!Label Area defination with lines
sar 10 grp 1 mno 2 t 0 nra 0 mctl 1
sarb out nl (1 12 1) mno 2

!*!Label Path for extrusion
sln 101
slnb x1 0 y1 -0.1 z1 -0.1 x2 4.8 y2 -0.1 z2 -0.1

!*!Label Point support
spt 201 x 0.0 y 0.0 z -0.1 fix PPMM
spt 202 x 4.8 y 0.0 z -0.1 fix PPMM

!*!Label 1st structural line
spt 301 x 1.4 y 0.1 z -0.1
spt 302 x 1.4 y -0.1 z -0.1
SLN 303 NPA 301 NPE 302 fix XP GRP 1

!*!Label 2nd Structural line
spt 401 x 3.4 y 0.1 z -0.1
spt 402 x 3.4 y -0.1 z -0.1
SLN 403 NPA 401 NPE 402 fix XP GRP 1

!*!Label Line load
sln 102
slnb x1 0 y1 0 z1 0.1 x2 4.8 y2 0 z2 0.1

end

+prog sofimsha urs:3
head Extrusion to volume
syst REST
$extr QUAD from SAR 10 path SLN 101
grp 2
bric prop mno 2
extr type quad grp 1 path sln 101

end

+prog sofiload urs:4
head Loads Defination
act G $ permanent action
act Q $ varaible action

!*!Label Self-weight
$LC 1 type G dlz 1 titl “Self Weight”
LC 1 type G facd 1 titl “Self Weight”

!*!Label varaible load: Line load
$LC 2 type Q titl “Line Loads without deadweight”
$ line sln 102 type PG P1 70 P2 10 x1 0.0 y1 0.0 z1 0.1 x2 2.4 y2 0.0 z2 0.1
LC 2 type Q facd 1 titl “Line Loads”
line sln 102 type PG P1 1000 P2 1200 x1 2.4 y1 0.0 z1 0.1 x2 4.8 y2 0.0 z2 0.1

!*!Label Varaible load: Point load

LC 3 type Q titl “Point load”
poin ref sln no 102 type PZZ P -550 x 2.4 y 0.0 z 0.1

$LC 5 type Q facd 1 titl “Point load with deadload effect”
$ poin ref sln 102 type PZZ P -2.5 x 2.4 y 0.0 z 0.1

end

+prog ase urs:21
head Linear analysis
echo full extr
lc alle
end

Please let me know if anything is unclear.
Thank you in advance.

The spring elements originate from the command
SARB OUT NL (1 12 1) MNO 2.

With MNO 2, you define a material as a boundary, which is then interpreted as spring elements with the stiffness properties of material 2.

Question 2 I dont understand

Thank you very much for your help. I removed the material part from SARB, Sofistik does not create spring elements anymore.

Regarding second question.

I have created HEB beam by converting points into line and then lines to area. Used this area to extrude along the lengths to create to create a solid 4.8m long Beam.

Problem with this method is its too long procedure and i could not create a radius between the intersection of web and flange ( Hence,i have sharp corners… which results in stress singularity).

I want to use built-in PROF field
prof 44 HEB 200 dtyp S
With this field, i could only create Beam elements and i want to have solid bric elements. Is it possible to create a extrusion for 4.8m with Solid Bric element with PROF syntax.

I am completely new to Sofistik and Teddy. I have also not worked with Sofiplus-X (because we do not have Sofiplus-X license)

why do you want volume elements instead of beam elements?

I need accurate stress and strain data to calibrate FEM model with sensors data and volume elements would be a better choice. Although beam elements would give good global response like moments and forces, i am more interested in local effect