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CFVR1437 - Torsion checking according to EHE-08

Check a reinforced concrete beam subjected to torsional moment according to EHE-08

A fixed beam which has a rectangular reinforced concrete section is subjected to a shear force of 7.52 Mp and a torsional moment of 1.52 Mp*m.
The aim of the example is to obtain the check criterion according to EHE-08.

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
Code Checking/Design
Reinforced Concrete
EHE

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: CFVR1437.DAT


   FINISH
  ~CFCLEAR,,1
  NomFile='CFVR1437'
 /TITLE,%NomFile%, TORSION CHECKING ACCORDING TO EHE-08

! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
~UNITS,,LENG,M
~UNITS,,TIME,S
~UNITS,,FORC,MP
~CODESEL,EC3-92,EHE-08,,,EC8-94

! Preprocessor
  /PREP7

! Parameters
  L=1              ! Length in m
  b=.4             ! Cross-section width in m.
  h=.3             ! Depth in m.
  T=0.95*1.6       ! Torsional moment in Mp*m
  Q=4.7*1.6        ! Maximum concomitant design shear force in Mp

! Material Definition
 ~CFMP,1,LIB,CONCRETE,EHE,HA-25
 ~CFMP,2,LIB,REINF,EHE,B400S

! Element Type Definition
  ET,1,Beam4                            ! Element Type 1: 3D Beam

! Cross-section definition
 ~CSECDMS,1,REC,1,0.3,0.4

! Reinforcement definition
 ~RNFDEF,1,TORSION,2,3.03e-4, , , ,3.27e-4

! Beam properties
  ~BMSHPRO,1,BEAM,1,1,,,4,,,,Beam Prop.

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

/SOLU
  F,5,FY,-Q
  F,5,MX,T
  SOLVE               ! Calculation

/POST1

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

! Torsion checking according to EHE
  ~CHKCON,SHT,TORSION

!--------------------------------------------------------------------------------------
! DATA CHECK
!--------------------------------------------------------------------------------------
! Data comparison number
  NComp = 4
  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) = 'TU1'
  LABEL(2,1) = 'TU2'
  LABEL(3,1) = 'TU3'
  LABEL(4,1) = 'CRT_TOT'

! Correct values
  VALUE(1,1)=3.532
  VALUE(2,1)=1.446
  VALUE(3,1)=1.478
  VALUE(4,1)=1.050

! Comparison
 ~PLLSCON,TU1
 *GET,VALUE(1,2),ELEM,3,ETAB,CFETAB_J
 ~PLLSCON,TU2
 *GET,VALUE(2,2),ELEM,3,ETAB,CFETAB_J
 ~PLLSCON,TU3
 *GET,VALUE(3,2),ELEM,3,ETAB,CFETAB_J
 ~PLLSCON,CRT_TOT
 *GET,VALUE(4,2),ELEM,3,ETAB,CFETAB_J

! Warning and error tolerances
  TOLER( 1, 1)= 1E-02 $ TOLER( 1, 2)= 1E-02
  TOLER( 2, 1)= 1E-02 $ TOLER( 2, 2)= 1E-02
  TOLER( 3, 1)= 1E-02 $ TOLER( 3, 2)= 1E-02
  TOLER( 4, 1)= 1E-02 $ TOLER( 4, 2)= 1E-02

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

Results

LabelTargetCivilFEMRatioTolerance
TU1 3.532 3.53181.000 0.01
TU2 1.446 1.44750.999 0.01
TU3 1.478 1.47781.000 0.01
CRT_TOT 1.05 1.05011.000 0.01


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