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CFVR0942 - Shell VF reinforcement check according to ACI-349

Bending and axial check taking into account only torsional moments.

The model is made up of a square shell element of 1.0m x 1.0m. The nodes of one side are completely restrained.
A surface load of 30000 kg/m2 is applied on the element.
The results are compared with those of two beams.
The reinforcement checking code is the ACI 349.

Element types used in the model: SHELL43

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
Shell
Shell Vertex
Reinforced Concrete
ACI 349

Model Statistics
Number of elements 3
Number of nodes 8
Number of civil materials 2
Number of cross sections 2
Number of shell vertices 1

Log file: CFVR0942.DAT


   FINISH
  ~cfclear,,1
   NomFile='CFVR0942'
  /TITLE, %NomFile%, Shell VF reinforcement check according to ACI-349

! ------------------------------------------------------------------------------
! Model definition and solve
! ------------------------------------------------------------------------------

! Setup
 ~UNITS,,MONE,EURO
 ~UNITS,,LENG,M
 ~UNITS,,TIME,S
 ~UNITS,,FORC,KP
 ~CODESEL,,ACI349

  /PREP7
! Materials
  ~CFMP,5,LIB,CONCRETE,EC2,C40/50
  ~CFMP,2,LIB,REINF,EC2,S400
! Element types
  ET,10,SHELL43
  ET,20,Beam44

! Shell Vertex
  t=0.25        ! Thickness
  r=0.04        ! Cover
  th = 0        ! Reinforcement angle
  AtReinf=0.001 ! reinforcement amount 10cm2/m
 ~SHLRNF,10,t,5,2,r,AtReinf,AtReinf,AtReinf,AtReinf,0,th,45

! Cross-section definition
 ~CSECDMS,20,REC,5,1.0,t       ! thickness t and witdh 1 m
 ~RNFDEF,20,1,2,1,0,r ,AtReinf ! MZ Top Reinf.: total area 10cm2/m
 ~RNFDEF,20,2,2,3,0,r ,AtReinf ! MZ Bot Reinf.: total area 10cm2/m
 ~CSECDMS,30,REC,5,1.0,t
 ~RNFDEF,30,3,2,1,0,r ,AtReinf ! MY Top Reinf.: total area 10cm2/m
 ~RNFDEF,30,4,2,3,0,r ,AtReinf ! MY Bot Reinf.: total area 10cm2/m

! Member property, phi calculated by CivilFEM
  ~MEMBPRO,1,ACI349,PHI,0.0

 
! Beam & Shell property
 ~BMSHPRO,10,SHELL,10,,,,43,1,,,Shell property
 ~BMSHPRO,20, BEAM,20,,,,44,1,,,Beam property
 ~BMSHPRO,30, BEAM,30,,,,44,1,,,Beam property

! Shell Nodes
  N,10,0,0
  N,20,1.00,0
  N,40,0,1.00
  N,50,1.00,1.00

! Shell Elements
  MAT,5
  REAL,10
  TYPE,10
  EN,100, 10, 20, 50, 40

! Shell Boundary conditions
  D,10,ALL,0.0
  D,40,ALL,0.0

! Beam Nodes
  N,100, ,0.5,-2
  N,200,1,0.5,-2
  N,1100, ,0.5,-4
  N,1200,1,0.5,-4

! Beam Elements
  MAT,5
  TYPE,20
  REAL,20
  EN,300,100,200
  REAL,30
  EN,400,1100,1200

! Beam Boundary conditions
  D,100,ALL
  D,1100,ALL

  FINISH
  /SOLU
! Pressure on shells
  ESEL,S,ENAME,,43
  SFE,100,2,PRES,,3E4
  ALLSEL
  SOLVE

  FINISH
  /POST1
!-------------------------------------------------------------------------------
! 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) = 'CRT_X'
  LABEL( 2,1) = 'CRT_Y'
  LABEL( 3,1) = 'CRT_X_PHI'
  LABEL( 4,1) = 'CRT_Y_PHI'

  ~CFSET,,1
  ESEL,S,ENAME,,43
  ~CFGET, Tx_Shell, ELEMENT, 100, FORCE, TX, J   ! Axial force X direction
  ~CFGET, Ty_Shell, ELEMENT, 100, FORCE, TY, J   ! Axial force Y direction
  ~CFGET, Mx_Shell, ELEMENT, 100, FORCE, MX, J   ! Bending moment X direction
  ~CFGET, My_Shell, ELEMENT, 100, FORCE, MY, J   ! Bending moment Y direction
  ~CFGET,Mxy_Shell, ELEMENT, 100, FORCE,MXY, J   ! Torsional moment

! Correct values
  ~CHKCON,SHELL,VF, ,2,0, ! ONLY TORSIONAL MOMENTS
  ~CFSET,1
  ~CFGET,VALUE(1,1), ELEMENT, 100 ,RESULT , CRT_X, J ! Total Criterion X direction
  ~CFGET,VALUE(2,1), ELEMENT, 100 ,RESULT , CRT_Y, J ! Total Criterion Y direction
  
  ! Changes phi to constant value = 0.65
  /PREP7
  ~MEMBPRO,1,ACI349,PHI,0.65
  
  /POST1
  ~CHKCON,SHELL,VF, ,2,0, ! ONLY TORSIONAL MOMENTS
  ~CFGET,VALUE(3,1), ELEMENT, 100 ,RESULT , CRT_X, J ! Total Criterion X direction
  ~CFGET,VALUE(4,1), ELEMENT, 100 ,RESULT , CRT_Y, J ! Total Criterion Y direction
  
  ! Changes phi to calculated by civilFEM
  /PREP7
  ~MEMBPRO,1,ACI349,PHI,0.0
  
  FINISH
  /SOLU

! Apply Forces to beam element J end
  Mx_Beam=Mx_Shell+ABS(Mxy_Shell)*Mx_Shell/ABS(Mx_Shell) ! MyBeam=MxShell
  My_Beam=My_Shell+ABS(Mxy_Shell)*My_Shell/ABS(My_Shell) ! MzBeam=MyShell
  ESEL,S,ENAME,,44
  NSLE
  F, 200,FX,Tx_Shell
  F, 200,MY,Mx_Beam
  F,1200,FX,Ty_Shell
  F,1200,MY,My_Beam

  ALLSEL
  SOLVE

  FINISH
  /POST1

  ! Bending + Axial checking according to ACI 349
  ~CFSET,,1
  ~CHKCON,2DB, ,1, , ,0   ! XZ Local Plane (MY)

  ! Comparison
  ~CFGET,VALUE(1,2),ELEMENT,300,RESULT,CRT_TOT, J
  ~CFGET,VALUE(2,2),ELEMENT,400,RESULT,CRT_TOT, J
  
  ! Changes phi to calculated by civilFEM
  /PREP7
  ~MEMBPRO,1,ACI349,PHI,0.65
  
  /POST1
  
   ~CHKCON,2DB, ,1, , ,0   ! XZ Local Plane (MY)

  ! Comparison
  ~CFGET,VALUE(3,2),ELEMENT,300,RESULT,CRT_TOT, J
  ~CFGET,VALUE(4,2),ELEMENT,400,RESULT,CRT_TOT, J
  
 
! Warning and error tolerances
  TOLER(1,1) = 1.6E-2*ABS(VALUE(1,1)) $ TOLER(1,2) = TOLER(1,1) 
  TOLER(2,1) = 1.E-2*ABS(VALUE(2,1)) $ TOLER(2,2) = TOLER(2,1)
  TOLER(3,1) = 1.6E-2*ABS(VALUE(3,1)) $ TOLER(3,2) = TOLER(3,1)
  TOLER(4,1) = 1.E-2*ABS(VALUE(4,1)) $ TOLER(4,2) = TOLER(4,1)

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

Results

LabelTargetCivilFEMRatioTolerance
CRT_X 0.97847 0.993130.985 0.01566
CRT_Y 0.76991 0.771090.9990.007699
CRT_X_PH 1.0607 1.07480.987 0.01697
CRT_Y_PH 0.82007 0.821380.9980.008201


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