CFVR4504 - GB50017: Axial + Bending Checking

A pinned-pinned steel beam is subjected to:

compression load of 800 kips applied on the beam ends
bending moment Mz of 400 kips·ft applied on one beam end
bending moment Mz of 200 kips·ft applied on the other end

The beam has a length of 240 in.
The cross section is a double T W 27x84.
The beam is made of GB 50017 Q390 steel.
The aim of the example is to obtain axial + bending checking criterion according to GB50017.

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

Steel

Code Checking/Design

GB 50017

Model Statistics
Number of elements	19
Number of nodes	20
Number of civil materials	1
Number of cross sections	1
Number of shell vertices	0

Log file: CFVR4504.DAT

  FINISH
  ~CFCLEAR,,1
  NomFile='CFVR4504'
  /TITLE, %NomFile%, GB50017: Axial + Bending Checking

! ---------------------------------------------------------------------------------
! Model definition
! ---------------------------------------------------------------------------------
! CivilFEM Setup: Code & Units
  ~CODESEL,GB50017,EC2,,,EC8-94
  ~UNITS,,LENG,IN
  ~UNITS,,TIME,S
  ~UNITS,,FORC,KIPS
  ~UNITS,,PRES,,0,uuP
  ~UNITS,,MASS,,0,uuM

  /PREP7
! Preprocessor
! --------------------------------------------------
! Materials
  ~CFMP,1,LIB,STEEL,GB50017,Q390   ! GB50017  Q390
! Element Types
  ET,1,Beam3
! Cross Section
  ~SSECLIB,1,1,51,91   ! W 27x84   I Double T
! Beam & Shell Property
  ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam 1
! Member property
  ~MEMBPRO,1,GB50017,ALL,0.0,0.0,0,0,240.0,1.0,1.0

! Nodes
  N,1
  N,20,,240
  FILL,1,20,18, , ,1,1,1,
! Elements
  E,1,2
  EGEN,19,1,1,1

! Solution
! --------------------------------------------------
/SOLU
! Constrains
  D,1, , , , , ,UX,UY, , , ,
  D,20, , , , , ,UX, , , , ,
! Apply Load
  F,20,FY,-800
  F,1,FY,800
  F,20,MZ,-420*12
  F,1,MZ,200*12
! Solve
  SOLVE

/POST1
! Postprocessor
! --------------------------------------------------
! Read results
  ~CFSET,,1,1                  ! First load case
! Axial+bending checking
  ~CHKSTL,BEND_AXL

!--------------------------------------------------------------------------------------
! DATA CHECK
!--------------------------------------------------------------------------------------
  NComp    =  4
  NComp_ch =  0

! Marix 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) = 'GAMY'
  LABEL(2,1) = 'GAMZ'
  LABEL(3,1) = 'SEQ'
  LABEL(4,1) = 'CRT_TOT'

! Correct values
  VALUE(1,1 ) = 1.2
  VALUE(2,1 ) = 1.05
  VALUE(3,1 ) = -4.8549713968E+01
  VALUE(4,1 ) = 9.9921938646E-01

! Obtained values
  ~PLLSSTL,GAMY
  *GET,VALUE(1,2),ELEM,10,ETAB,CFETAB_I
  ~PLLSSTL,GAMZ
  *GET,VALUE(2,2),ELEM,10,ETAB,CFETAB_I
  ~PLLSSTL,SEQ
  *GET,VALUE(3,2),ELEM,10,ETAB,CFETAB_I
  ~PLLSSTL,CRT_TOT
  *GET,VALUE(4,2),ELEM,10,ETAB,CFETAB_I

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

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

Results

Label	Target	CivilFEM	Ratio	Tolerance
GAMY	1.2	1.2	1.000	0.0001
GAMZ	1.05	1.05	1.000	1e-005
SEQ	-48.55	-48.55	1.000	0.01
CRT_TOT	0.99922	0.99922	1.000	1e-005

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CFVR4504 - GB50017: Axial + Bending Checking

Results