Left

CivilFEM Online Help

Right

CFVR7293 - Bending + Axial force design according to ACI 349 13

Design a reinforced concrete beam subjected to Bending + Axial force according to ACI 349 13

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 necessary steel amount according to ACI 349 13. The reinforcement will not be in spiral so "Other cases" option is selected.

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 13

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: CFVR7293.DAT


   FINISH
  ~CFCLEAR,,1
   NomFile='CFVR7293'
 /TITLE,%NomFile%, BENDING + AXIAL FORCE DESIGN ACCORDING TO ACI 349 13

! -------------------------------------------------------------------------------------
! Initial data
! -------------------------------------------------------------------------------------
! CivilFEM SETUP
  ~UNITS,BIN    !in,sg,Pound force
~CODESEL,EC3-05,ACI34913,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,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   !Other cases

!--------------------------------------------------------------------------------------
! 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) = 'REINFACT'

! Correct values
  VALUE(1,1)=1.000
  VALUE(2,1)=10.472

! 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
REINFACT 10.472 10.6280.985 0.3


Contains proprietary and confidential information of Ingeciber, S.A.