CFVR7223 - Biaxial Bending + Axial force checking according to ACI 349

Check a reinforced concrete beam subjected to Biaxial Bending + Axial force according to ACI 349

A fixed beam which has a box reinforced concrete section is subjected to an axial compression force of 240 Mp, a bending moment of 40 m*Mp on the Z axis direction, and a bending moment of 30 m*Mp on the Y axis direction.
The aim of the example is to obtain the check criterion 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: CFVR7223.DAT

   FINISH
  ~CFCLEAR,,1
   NomFile='CFVR7223'
 /TITLE,%NomFile%, Biaxial BENDING + AXIAL FORCE CHECKING ACI 349

! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
 ~CFACTIV,NUCL,Y
 ~UNITS,BIN
 ~CODESEL,,ACI349
 
  ! Parameters
 fc=3500    								   ! Concrete material (psi)
 rhoF= 2500 								   ! density (fixed value)
 rho=(rhoF*.0254**3)/175.1268 				   ! Bin units
 gam = (rho*((9.81*175.1268)/4.448))*12**3     ! specific weight in lb/ft**3
 Ec_ACI=33*sqrt(fc)*gam**1.5 				   ! Ec ACI

! Preprocessor
  /PREP7

! Material Definition
 ~CFMP,1,LIB,CONCRETE,ACI,fc_3500
 ~CFMP,2,LIB,REINF,ACI,fy_70000
 
 FINISH
 ~UNITS,,LENG,M
 ~UNITS,,TIME,S
 ~UNITS,,FORC,MP
 /PREP7
 
! Element Type Definition
  ET,1,Beam4                            ! Element Type 1: 3D Beam

! Cross-section definition
 ~CSECDMS,1,BOX,1,0.65,0.5,0.15,0.1
! Reinforcement definition
 ~RNFDEF,1,1,2,4,0,0.046,0.512E-2
 ~SECMDF,1,STRPROP,ASEC,,7  

! Beam & Shell property
 ~BMSHPRO,1,BEAM,1,1,,,4,1,0,,Beam property

! 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
  M1=40               ! 40 m*Mp bending moment
  M2=30               ! 30 m*Mp bending moment
  H=-240              ! 240 Mp axial force
  F,5,FX,H
  F,5,MZ,M1
  F,5,MY,M2
  SOLVE               ! Calculation

/POST1
! Postprocessor
  ~CFSET,,1,1       ! Read first load step

! Biaxial Bending + Axial force checking according to ACI 349
  ~CHKCON,3DB

!--------------------------------------------------------------------------------------
! 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)=1.562
  VALUE(2,1)=1.562

! 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)= 5E-02 $ TOLER( 1, 2)= 5E-02
  TOLER( 2, 1)= 5E-02 $ TOLER( 2, 2)= 5E-02

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

Results

Label	Target	CivilFEM	Ratio	Tolerance
CRTC2D_I	1.562	1.5518	1.007	0.05
CRTC2D_J	1.562	1.5518	1.007	0.05

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CFVR7223 - Biaxial Bending + Axial force checking according to ACI 349

Check a reinforced concrete beam subjected to Biaxial Bending + Axial force according to ACI 349

Results