Hello Guys

I am trying to do an elastic/plastic analysis of a given cross section with aqua and aqb. i am just trying to get the correct stress - state for given acting forces in aqb.

however, as far as i understand it - the full plastic strain state is not calculated correctly in my file. you can see it as the areas above and below the neutral axis are not equal but the cross section is nearly in full plastic mode. hence there has to be an acting normal force which is not in equlibrium with the forces given by me.

i am suspicious that sofistik is calculating something in regards to “effective cross sectional depth” with steel profiles. however i am not sure if thats the problem and if it is like that how to solve it.

maybe someone can help me.

best regards

code below:

+prog aqua urs:1

KOPF U-Profil Test

ECHO VOLL EXTR

STEU STYP FEMX !SAVE THE MESH

STEU HDIV 0.5[-] !REFINE MESH BY A FACTOR

NORM DC EN 1993-2005

UNIT TYPE 7

STO#fy 636

STO#eniro 145000

STAH NR 1 ART B FY #fy FT #fy ES #eniro EPSY #fy/#eniro*1000 EPST 1000 SCM 1.0

$ define U-Profil

QNR 1 MNR 1 LTAU 100

QPOL ART U

QP NR 1 Y 0.0000 Z -0.0000

QP NR 2 Y 4.3000 Z -0.0000

QP NR 3 Y 4.3000 Z -15.7000

QP NR 4 Y 4.9699 Z -18.2000

QP NR 5 Y 6.8000 Z -20.0301

QP NR 6 Y 9.3000 Z -20.7000

QP NR 7 Y 15.0000 Z -20.7000

QP NR 8 Y 20.7000 Z -20.7000

QP NR 9 Y 23.2000 Z -20.0301

QP NR 10 Y 25.0301 Z -18.2000

QP NR 11 Y 25.7000 Z -15.6135

QP NR 12 Y 25.7000 Z -0.0000

QP NR 13 Y 30.0000 Z -0.0000

QP NR 14 Y 30.0000 Z -15.6135

QP NR 15 Y 28.7540 Z -20.3500

QP NR 16 Y 25.3500 Z -23.7540

QP NR 17 Y 20.7000 Z -25.0000

QP NR 18 Y 15.0000 Z -25.0000

QP NR 19 Y 9.3000 Z -25.0000

QP NR 20 Y 4.6500 Z -23.7540

QP NR 21 Y 1.2460 Z -20.3500

QP NR 22 Y 0.0000 Z -15.7359

ENDE

PROG AQB urs:2

KOPF PLASTISCHE SG VERTEILUNG

ECHO VOLL EXTR

give acting forces
Plastic Moment from ReportBrowser

S NQ 1 NR 01 X 0 N 0.00 MY 1.165

S NQ 1 NR 01 X 1 N 0.00 MY -1.165

DEHN KMOD Gebr KSV SL

$ now the problem occurs - see result viewer - calculated stresses are not in equilibrium

ENDE