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CFVR1316 - Bending + Axial force design according to ACI 318

Design a reinforced concrete beam subjected to Bending + Axial force according to ACI 318

A fixed beam which has a pipe reinforced concrete section is subjected to an axial compression force of 236 kips and a bending moment of 179 ft-kips.
The aim of the example is to obtain the necessary steel amount according to ACI 318.

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 318

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: CFVR1316.DAT


   FINISH
  ~CFCLEAR,,1
   NomFile='CFVR1316'
 /TITLE,%NomFile%, BENDING + AXIAL FORCE DESIGN ACCORDING TO ACI 318

! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
  ~UNITS,BIN    !in,sg,Pound force
  ~CODESEL,,ACI

! Preprocessor
  /PREP7

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

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

! Cross-section definition
 ~CSECDMS,1,PIPE,1,20,4,

! Reinforcement definition
 ~RNFDEF,1,1,2,1,0,2,1             ! Total Reinf.area=1 in^2

! Beam & Shell property
 ~BMSHPRO,1,BEAM,1,1,,,4,1,0,,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 design for T sections according to ACI
  ~DIMCON,2DB,,0,1,20

!--------------------------------------------------------------------------------------
! 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)=1.000
  VALUE(2,1)=10.443

! Comparison
 ~PLLSCON,CRT_TOT
 *GET,VALUE(1,2),ELEM,4,ETAB,CFETAB_I
 ~PLLSCON,REINFACT
 *GET,VALUE(2,2),ELEM,4,ETAB,CFETAB_J

! Warning and error tolerances
  TOLER( 1, 1)= 3E-02   $ TOLER( 1, 2)= 5E-02
  TOLER( 2, 1)= 3E-01   $ TOLER( 2, 2)= 3E-01

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

Results

LabelTargetCivilFEMRatioTolerance
CRTC2D_I 1 0.999991.000 0.05
CRTC2D_J 10.443 10.6280.982 0.3


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