CFVR7269 - Bending + Axial force checking according to ACI 349 06

Check a reinforced concrete beam subjected to Bending + Axial force according to ACI 349 06

A fixed beam which has a pipe reinforced concrete section is subjected to an axial compression force of 214 Kips and a bending moment of 276 ft-kips.
The aim of the example is to obtain the check criterion according to ACI ACI 349 06. The reinforcement will not be in spiral so "Other cases" option is selected.
Variation of the problem included in notes on 318-95, PCA Association, 1996, Page 11-24, EX.11.4

Element types used in the model: BEAM3

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 06

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: CFVR7269.DAT

   FINISH
  ~CFCLEAR,,1
   NomFile='CFVR7269'
 /TITLE,%NomFile%, BENDING + AXIAL FORCE CHECKING ACCORDING TO ACI 349 06
! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
  ~UNITS,BIN    !in,sg,Pound force
  ~CODESEL,EC3-05,ACI34906,EC2-08,,EC8-04

! Preprocessor
  /PREP7

! Material Definition
 ~CFMP,1,LIB,CONCRETE,ACI,fc_5000
 ~CFMP,2,LIB,REINF,ACI,fy_60000

! Element Type Definition
  ET,1,Beam3                            ! Element Type 1: 2D Beam

! Cross-section definition
 ~CSECDMS,1,PIPE,1,20,4,
! Reinforcement definition
 ~RNFDEF,1,1,2,1,0,2,9.36,              ! Total Reinf.area=9.36 in^2
 
! Beam & Shell property
 ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam property

! Model Construction
  N,1                                   ! Nodes input
  N,5,200
  FILL,1,5
  E,1,2                                 ! Elements input
  EGEN,4,1,1,1
  D,1,ALL                               ! Boundary conditions

/SOLU
  M=3312000           ! 276 ft·kips vertical lumped force
  H=-214000           ! 214 Kips axial force
  F,5,FX,H
  F,5,MZ,M
  SOLVE               ! Calculation

/POST1

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

! Bending + Axial checking for I sections according to ACI 2014
  ~CHKCON,2DB,,0   !Other cases
  
! Plot the interaction diagram
 ~PL2DINT,BEAM,1,I,,,,,,MZ
!--------------------------------------------------------------------------------------
! 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)=1.044
  VALUE(2,1)=1.044

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

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

Results

Label	Target	CivilFEM	Ratio	Tolerance
CRTC2D_I	1.044	1.0568	0.988	0.1
CRTC2D_J	1.044	1.0568	0.988	0.1

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CFVR7269 - Bending + Axial force checking according to ACI 349 06

Check a reinforced concrete beam subjected to Bending + Axial force according to ACI 349 06

Results