CFVR1323 - Biaxial Bending + Axial force checking according to ACI 318
check a reinforced concrete beam subjected to Biaxial Bending + Axial force according to ACI 318
A fixed beam which has a box reinforced concrete section is subjected to an axial compression force of 181.45 Mp, a bending moment of 13.14 m*Mp on the Z axis direction, and a bending moment of 10.37 m*Mp on the Y axis direction.
The aim of the example is to obtain the check criterion according to ACI 318.
Element types used in the model: BEAM4 Needed CivilFEM Modules: |
|
| 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: CFVR1323.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR1323' /TITLE,%NomFile%, Biaxial BENDING + AXIAL FORCE CHECKING ACI 318 ! ------------------------------------------------------------------------------------- ! Initial data ! ------------------------------------------------------------------------------------- ! CivilFEM SETUP ~UNITS,BIN ~CODESEL,,ACI ! Parameters Ec_ACI=3820000 ! Psi ! Preprocessor /PREP7 ! Material Definition ~CFMP,1,LIB,CONCRETE,ACI,fc_3500 ~CFMP,1,USER ~CFMP,1,ACI_C ,Ec ,, Ec_ACI,7,0,0 ~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,1,1,2,4,0,0.046,0.5120E-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=15.5 ! 112.08 Kip*ft bending moment M2=11.06 ! 80 Kip*ft bending moment H=-172.38 ! 380 Kip 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 318 ~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)=0.61 VALUE(2,1)=0.61 ! 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 | 0.61 | 0.59808 | 1.020 | 0.05 |
| CRTC2D_J | 0.61 | 0.59808 | 1.020 | 0.05 |
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