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CFVR7228 - Torsion design according to ACI 349

Design a reinforced concrete beam subjected to Torsion moment according to ACI 349

A fixed beam which has a box reinforced concrete section is subjected to a shear force of 16 Mp and a torsional moment of 4.8 Mp*m.
The aim of the example is to obtain the necessary steel amount according to ACI 349.

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
ACI 349

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: CFVR7228.DAT


   FINISH
  ~CFCLEAR,,1
   NomFile='CFVR7228'
  /TITLE,%NomFile%,TORSION DESIGN ACCORDING TO ACI 349

! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
~CFACTIV,NUCL,Y
~UNITS,,LENG,M
~UNITS,,TIME,S
~UNITS,,FORC,MP
~CODESEL,EC3-92,ACI349,,,EC8-94

! Preprocessor
  /PREP7

! Parameters
  L=1              ! Length in m
  b=.3             ! Cross-section width in m.
  h=.8             ! Depth in m.
  T=3*1.6          ! Torsional moment in Mp*m
  Q=10*1.6         ! Maximum concomitant design shear force in Mp

! Material Definition
 ~CFMP,1,LIB,CONCRETE,ACI,fc_4500
 ~CFMP,2,LIB,REINF,ACI,fy_60000

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

! Cross-section definition
 ~CSECDMS,1,BOX,1,0.8,0.3,0.1,0.1
! Reinforcement definition
 ~RNFDEF,1,TORSION,2,1e-4, , , ,1e-4, ,
! Beam & Shell properties
  ~BMSHPRO,1,BEAM,1,1,,,4,,,,Beam property

! 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 ACI 349
  ~DIMCON,SHT,TORSION, , , , , ,1

!---------------------------------------------------------------------------------------
! 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) = 'ASLT'
  LABEL(2,1) = 'ASTT'

! Correct values
  VALUE(1,1)=0.93E-3
  VALUE(2,1)=0.49E-3

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

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

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

Results

LabelTargetCivilFEMRatioTolerance
ASLT 0.00093 0.00093460.995 1e-005
ASTT 0.000490.000497130.986 1e-005


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