CFVR2304 - Steel Checking according to LRFD

Compression flexural buckling checking according to LRFD 2nd Edition

A steel fixed column of 180 feet with TS12x12 section is subjected to an axial compression force of 472 kips on its free end.
Determine the equivalent slenderness parameter, critical stress, nominal axial strength, total criterion and section classification according to LRFD.

Element types used in the model: BEAM3

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
Code Checking/Design
Steel
LRFD 2

Model Statistics
Number of elements 14
Number of nodes 15
Number of civil materials 1
Number of cross sections 1
Number of shell vertices 0

Log file: CFVR2304.DAT


   finish
   ~CFCLEAR,,1
   NomFile='CFVR2304'
   /TITLE, %NomFile%, LRFD: Compression Flexural Buckling Checking

!------------------------------------------------------------------
! Model definition
!------------------------------------------------------------------
! CivilFEM Setup: Code & Units
   ~CODESEL,LRFD,EC2,,,EC8-94
   ~UNITS,,MONE,EURO
   ~UNITS,,LENG,FT
   ~UNITS,,TIME,S
   ~UNITS,,FORC,KIPS
   ~UNITS,,PRES,,0,uuP
   ~UNITS,,MASS,,0,uuM

/PREP7
! Preprocessor
! --------------------------------------------------
! Materials
  ~CFMP,1,LIB,STEEL,ASTM,A572Gr50
! Element Types
  ET,1,Beam3
! Cross Section
  ~SSECLIB,1,1,61,28   ! TS 12x12
! Beam & Shell Property
  ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam 1
! Member property
  ~MEMBPRO,1,LRFD,ALL,180,1.2,1.2,1.0,1.0,0.0,
  ~MEMBPRO,1,NLMOD,ALL,0
  ~MEMBPRO,1,NAME,Member Property 1
! Nodes
  N, ,,,,,,,
  N,15,,180,,,,,
  FILL,1,15,13, , ,1,1,1,
! Elements
  E,1,2
  EGEN,14,1,1,,1

! Solution
! --------------------------------------------------
/SOLU
! Constraints
  D,1,ALL
! Apply Load
  F,15,FY,-472
! Solve
  SOLVE

/POST1
! Postprocessor
! --------------------------------------------------
! Read results
  ~CFSET,,1,1                  ! First load step
! Compression Flexural Buckling checking
  ~CHKSTL,COMPFBK

!------------------------------------------------------------------
! DATA CHECK
!------------------------------------------------------------------
! Data comparison number
  NComp = 5
!  Paso  = 6
  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) = 'LAMBDA  '
  LABEL(2,1) = 'FCR     '
  LABEL(3,1) = 'PN      '
  LABEL(4,1) = 'CRT_TOT '
  LABEL(5,1) = 'CLS_COMP'

! Correct values
  VALUE(1,1)=0.71670962E+01
  VALUE(2,1)=0.12292653E+03
  VALUE(3,1)=0.99024150E+01
  VALUE(4,1)=0.56076635E+02
  VALUE(5,1)=3.0E+00

! Comparison
  ~CFGET,value( 1,2),ELEMENT,10,RESULT,LAMBDA  ,J
  ~CFGET,value( 2,2),ELEMENT,10,RESULT,FCR     ,J
  ~CFGET,value( 3,2),ELEMENT,10,RESULT,PN      ,J
  ~CFGET,value( 4,2),ELEMENT,10,RESULT,CRT_TOT ,J
  ~CFGET,value( 5,2),ELEMENT,10,RESULT,CLS_COMP,J

! Warning and error tolerances
  TOLER( 1, 1)= 1E-03 $ TOLER( 1, 2)= 1E-03
  TOLER( 2, 1)= 1E-03 $ TOLER( 2, 2)= 1E-03
  TOLER( 3, 1)= 1E-03 $ TOLER( 3, 2)= 1E-03
  TOLER( 4, 1)= 1E-03 $ TOLER( 4, 2)= 1E-03
  TOLER( 5, 1)= 1E-03 $ TOLER( 5, 2)= 1E-03

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

Results

LabelTargetCivilFEMRatioTolerance
LAMBDA 7.1671 7.16711.000 0.001
FCR 122.93 122.931.000 0.001
PN 9.9024 9.90241.000 0.001
CRT_TOT 56.077 56.0771.000 0.001
CLS_COMP 3 31.000 0.001

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