CFVR2713 - Bending + Axial force design according to AS3600

Design a reinforced concrete beam subjected to Bending + Axial force according to AS3600

A fixed beam which has a circular 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 AS3600.

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

AS3600

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: CFVR2713.DAT

   FINISH
  ~CFCLEAR,,1
   NomFile='CFVR2713'
 /TITLE,%NomFile%, BENDING + AXIAL FORCE DESIGN ACCORDING TO AS3600

! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
 ~UNITS,BIN    !in,sg,Pound force
 ~CODESEL,,AS3600
 
 ! Parameters
  fc=5000    								   ! 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_5000
 ~CFMP,1,USER
 ~CFMP,1,ACI_C   ,Ec      ,,  Ec_ACI,7,0,0
 ~CFMP,2,LIB,REINF,ACI,fy_60000

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

! Cross-section definition
 ~CSECDMS,1,CIRC,1,20
! Reinforcement definition
 ~RNFDEF,1,1,2,1,0,2,1       ! Total Reinf.area=1 in^2
                             ! Geometric cover=2 in

! Member Property
 ~MEMBPRO,1,AS3600,FI,0.75 ! FI=0.75
! Beam & Shell property
 ~BMSHPRO,1,BEAM,1,1,,,4,1,0,,Beam property

! Model
  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           ! 179 ft-kips vertical lumped force
  H=-214000           ! 236 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 AS3600
  ~DIMCON,3DB,,,5,10

!--------------------------------------------------------------------------------------
! 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) = 'CRT_TOT'
  LABEL(2,1) = 'REINFACT'

! Correct values
  VALUE(1,1)=1.00
  VALUE(2,1)=8.53

! 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)= 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
CRT_TOT	1	1.0008	0.999	0.05
REINFACT	8.53	8.5347	0.999	0.05

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CFVR2713 - Bending + Axial force design according to AS3600

Design a reinforced concrete beam subjected to Bending + Axial force according to AS3600

Results