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CFVR1417 - Torsion design according to EHE

Design a reinforced concrete beam submitted to torsion moment according to EHE

A fixed beam which has a rectangular reinforced concrete section is subjected to a torsional moment of 1.52 Mp*m and a shear force of 7.52 Mp.
The aim of the example is to obtain the necessary steel amount according to EHE.
The example is based on "PRONTUARIO INFORMATICO DEL HORMIGON ARMADO", CORRES-LEON-PEREZ-ARROYO-LOPEZ, 1994, PAGE 227

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: CFVR1417.DAT


  FINISH
  ~CFCLEAR,,1
  NomFile='CFVR1417'
  /TITLE,%NomFile%, Torsion design according to EHE

! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
~UNITS,,LENG,M
~UNITS,,TIME,S
~UNITS,,FORC,MP
~CODESEL,EC3-92,EHE-98,,,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,2,1e-4, , , ,1e-4

! Beam properties
  ~BMSHPRO,1,BEAM,1,1,,,4,0,0,,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 design according to EHE
  ~DIMCON,SHT,TORSION

!--------------------------------------------------------------------------------------
! DATA CHECK
!--------------------------------------------------------------------------------------
! Data comparison number
  NComp = 3
  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) = 'ASTT'
  LABEL(3,1) = 'ASLT'

! Correct values
  VALUE(1,1)=0.35306393E1
  VALUE(2,1)=0.31652624E-3
  VALUE(3,1)=0.33461345E-3

! Comparison
 ~PLLSCON,TU1
 *GET,VALUE(1,2),ELEM,3,ETAB,CFETAB_J
 ~PLLSCON,ASTT
 *GET,VALUE(2,2),ELEM,3,ETAB,CFETAB_J
 ~PLLSCON,ASLT
 *GET,VALUE(3,2),ELEM,3,ETAB,CFETAB_J

! Warning and error tolerances
  TOLER( 1, 1)= 1E-02 $ TOLER( 1, 2)= 1E-02
  TOLER( 2, 1)= 1E-05 $ TOLER( 2, 2)= 1E-05
  TOLER( 3, 1)= 1E-05 $ TOLER( 3, 2)= 1E-05

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

Results

LabelTargetCivilFEMRatioTolerance
TU1 3.5306 3.53181.000 0.01
ASTT0.000316530.000318170.995 1e-005
ASLT0.000334610.000336350.995 1e-005


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