CFVR7907 - CTE DB SE-A test: Compression Buckling

compression buckling checking according to CTE DB SE-A

A fixed steel beam subjected to a Fy load of -250 kN, applied to an end of the beam.
The beam has a length of 10 m.
The cross section is a 2 UPN 180.
The beam is made of Fe 460 steel which has a fy of 460000 kN/m².
The aim of the example is to obtain the cross section classification and compression buckling criterion according to CTE DB SE-A.

Element types used in the model: BEAM4

Needed CivilFEM Modules:
Geotechnical Module
Bridges and Civil Non Linearities Module
Advanced Prestressed Concrete Module

The example can be launched on an educational license.

KEYWORDS

Beam

Cross Section

Steel

Code Checking/Design

CTE

Model Statistics
Number of elements	24
Number of nodes	25
Number of civil materials	1
Number of cross sections	1
Number of shell vertices	0

Log file: CFVR7907.DAT

   FINISH
  ~CFCLEAR,,1
   NomFile='CFVR7907'
  /TITLE, %NomFile%, CTE DB SE-A test: Compression Buckling

! ---------------------------------------------------------------------------------
! Model definition and solve
! ---------------------------------------------------------------------------------
! CivilFEM Setup: Code & Units
  ~UNITS,,LENG,M
  ~UNITS,,TIME,S
  ~UNITS,,FORC,KN
  ~CODESEL,CTESEA,EC2,,,EC8-94
/PREP7
! Materials
 ~CFMP,1,LIB,STEEL,UNE,S 460

! Element Types
  ET,1,BEAM4 ! Type 1: 3D Beam

! Cross Sections
  ~SSECLIB,1,1,94,6    ! 2 UPN 180

! Member properties
  ~MEMBPRO,1,CTESEA,ALL,10,1.0,1.0,1,1,1,1,0.8,1.0,1.0,1,0

! Beam properties
  ~BMSHPRO,1,BEAM,1,,,,4,1,0,,

! Nodes
  N, 1
  N,25,,10
  FILL,1,25
! Elements
  E,1,2
  EGEN,24,1,1
  EPLOT
/SOLU
! Restraints
  D, 1,UX
  D, 1,UY
  D, 1,UZ
  D,25,UX
  D,25,UZ
  D,ALL,ROTY
! Apply Load
  F,25,FY,-250
! Solve
  SOLVE
/POST1
! Read results
  ~CFSET,,1,1       ! Read the first load step

! Check Buckling checking
  ~CHKSTL,BUCK_CMP,-Z,PARTIAL

!--------------------------------------------------------------------------------------
! DATA CHECK
!--------------------------------------------------------------------------------------
! Data comparison number
  NComp = 8
  NComp_ch =  0

! Matrix dim.
  *DIM,LABEL,CHAR,Ncomp,1
  *DIM,LABEL_CH,CHAR,Ncomp_ch,1
  *DIM,VALUE,,Ncomp,3
  *DIM,VALUE_CH,CHAR,Ncomp_ch,3
  *DIM,TOLER,,Ncomp,2

! Labels
!--------------------------------------------------------------------------------------
  LABEL( 1,1) = 'CLASS'
  LABEL( 2,1) = 'ALP_Z'
  LABEL( 3,1) = 'AREA'
  LABEL( 4,1) = 'LAM_Z'
  LABEL( 5,1) = 'PHI_Z'
  LABEL( 6,1) = 'CHI_Z'
  LABEL( 7,1) = 'NBRD'
  LABEL( 8,1) = 'CRT_TOT'

! Correct values
!--------------------------------------------------------------------------------------
  VALUE( 1,1)=   1
  VALUE( 2,1)=   0.13
  VALUE( 3,1)=   5.6E-3
  VALUE( 4,1)=   2.726
  VALUE( 5,1)=   4.379
  VALUE( 6,1)=   0.128
  VALUE( 7,1)=   314.22
  VALUE( 8,1)=   0.795

! Obtained values
!--------------------------------------------------------------------------------------
 ~PLLSSTL,CLASS
 *GET,VALUE( 1,2),ELEM,1,ETAB,CLASS_J
 ~PLLSSTL,ALP_Z
  *GET,VALUE( 2,2),ELEM,1,ETAB,CFETAB_J
 ~PLLSSTL,AREA
  *GET,VALUE( 3,2),ELEM,1,ETAB,CFETAB_J
 ~PLLSSTL,LAM_Z
  *GET,VALUE( 4,2),ELEM,1,ETAB,CFETAB_J
 ~PLLSSTL,PHI_Z
  *GET,VALUE( 5,2),ELEM,1,ETAB,CFETAB_J
 ~PLLSSTL,CHI_Z
  *GET,VALUE( 6,2),ELEM,1,ETAB,CFETAB_J
 ~PLLSSTL,NBRD
  *GET,VALUE( 7,2),ELEM,1,ETAB,CFETAB_J
 ~PLLSSTL,CRT_TOT
  *GET,VALUE( 8,2),ELEM,1,ETAB,CFETAB_J

! Warning and error tolerances
  TOLER( 1,1)= 0    $ TOLER( 1,2)= 0
  TOLER( 2,1)= 1E-2 $ TOLER( 2,2)= 1E-2
  TOLER( 3,1)= 1E-4 $ TOLER( 3,2)= 1E-4
  TOLER( 4,1)= 1E-3 $ TOLER( 4,2)= 1E-3
  TOLER( 5,1)= 1E-1 $ TOLER( 5,2)= 1E-1
  TOLER( 6,1)= 1E-2 $ TOLER( 6,2)= 1E-2
  TOLER( 7,1)= 1    $ TOLER( 7,2)= 1E1
  TOLER( 8,1)= 1E-2 $ TOLER( 8,2)= 1E-2

!--------------------------------------------------------------------------------------
! Results comparison
!--------------------------------------------------------------------------------------
  COMPARA.MAC

Results

Label	Target	CivilFEM	Ratio	Tolerance
CLASS	1	1	1.000	0
ALP_Z	0.13	0.13	1.000	0.01
AREA	0.0056	0.0056	1.000	0.0001
LAM_Z	2.726	2.7255	1.000	0.001
PHI_Z	4.379	4.3783	1.000	0.1
CHI_Z	0.128	0.12813	0.999	0.01
NBRD	314.22	314.33	1.000	10
CRT_TOT	0.795	0.79533	1.000	0.01

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CFVR7907 - CTE DB SE-A test: Compression Buckling

compression buckling checking according to CTE DB SE-A

Results