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CFVR7104 - Bending + Axial force checking according to NBR6118

Check a reinforced concrete beam subjected to Bending + Axial force according to NBR6118

A fixed beam which has a T reinforced concrete section is subjected to a bending moment of 1800 kN*m .
The aim of the example is to obtain the check criterion according to NBR6118.

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
Reinforced Concrete
NBR 6118

Model Statistics
Number of elements 4
Number of nodes 5
Number of civil materials 2
Number of cross sections 1
Number of shell vertices 0

Log file: CFVR7104.DAT


   FINISH
  ~CFCLEAR,,1
   NomFile='CFVR7104'
 /TITLE,%NomFile%, BENDING + AXIAL FORCE CHECKING ACCORDING TO NBR6118

! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
  ~UNITS,,LENG,M
  ~UNITS,,TIME,S
  ~UNITS,,FORC,KN
 ~CODESEL,EC3-92,NBR6118,,,EC8-94

! Preprocessor
  /PREP7

! Material Definition
 ~CFMP,1,LIB,CONCRETE,NBR6118,C20
 ~CFMP,2,LIB,REINF,NBR6118,CA50

! Element Type Definition
  ET,1,Beam3                            ! Element Type 1: 2D Beam

! Cross-section definition
 ~CSECDMS,1,T,1,0.85,0.3,1.2,0.2
! Reinforcement definition
 ~RNFDEF,1,1,2,2,0,0.05,0.7320E-02  ! Total Reinf. Area= 7.3e-3 m^2
! Beam & Shell property
 ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,

! Model Construction
  N,1                                   ! Nodes input
  N,5,5
  FILL,1,5
  E,1,2                                 ! Elements input
  EGEN,4,1,1,1
  D,1,ALL                               ! Boundary conditions

/SOLU
  M=1800              ! 1800kN*m bending moment
  F,5,MZ,M
  SOLVE               ! Calculation

/POST1

! Postprocessor
  ~CFSET,,1,1       ! Read first load step

! Bending + Axial checking according to NBR6118
  ~CHKCON,2DB,,0

!--------------------------------------------------------------------------------------
! DATA CHECK
!--------------------------------------------------------------------------------------
! Data comparison number
  NComp = 2
  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) = 'CRTC2D_I'
  LABEL(2,1) = 'CRTC2D_J'

! Correct values
  VALUE(1,1)=0.847
  VALUE(2,1)=0.847

! Comparison
 ~PLLSCON,CRT_TOT
 *GET,VALUE(1,2),ELEM,4,ETAB,CFETAB_I
 ~PLLSCON,CRT_TOT
 *GET,VALUE(2,2),ELEM,4,ETAB,CFETAB_J

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

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

Results

LabelTargetCivilFEMRatioTolerance
CRTC2D_I 0.847 0.845381.002 0.05
CRTC2D_J 0.847 0.845381.002 0.05


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