CFVR7110 - Torsion checking according to NBR6118
Check a reinforced concrete beam subjected to torsional moment according to NBR6118
A fixed beam which has a rectangular reinforced concrete section is subjected to a shear force of 7.52 Mp and a torsional moment of 1.52 Mp*m.
The aim of the example is to obtain the check criterion according to NBR6118.
Element types used in the model: BEAM4 Needed CivilFEM Modules: |
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| 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: CFVR7110.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR7110' /TITLE,%NomFile%, TORSION CHECKING ACCORDING TO NBR6118 ! ------------------------------------------------------------------------------------- ! Initial data ! ------------------------------------------------------------------------------------- ! CivilFEM SETUP ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,MP ~CODESEL,EC3-92,NBR6118,,,EC8-94 ! Preprocessor /PREP7 ! Parameters L=1 ! Length in m b=.4 ! Cross-section width in m. h=.3 ! Depth in m. T=0.95*1.6 ! Torsional moment in Mp*m Q=4.7*1.6 ! Maximum concomitant design shear force in Mp ! Material Definition ~CFMP,1,LIB,CONCRETE,NBR6118,C25 ~CFMP,2,LIB,REINF,NBR6118,CA50 !CONCRETE,1, ,0,306, 601, ,1.5,1.15, ! Element Type Definition ET,1,Beam4 ! Element Type 1: 3D Beam ! Cross-section definition ~CSECDMS,1,REC,1,0.3,0.4 ! Reinforcement definition ~RNFDEF,1,TORSION,2,3.03e-4, , , ,3.27e-4 !Torsion reinforcement ! Beam properties ~BMSHPRO,1,BEAM,1,1,,,4,1,0 ! Model Construction N,1 ! Nodes input N,5,L FILL,1,5 E,1,2 ! Elements input EGEN,4,1,1,1 D,1,ALL ! Boundary conditions /SOLU F,5,FY,-Q F,5,MX,T SOLVE ! Calculation /POST1 ! Postprocessor ~CFSET,,1,1 ! Read the first load step ! Torsion checking according to NBR6118 ~CHKCON,SHT,BOTH !-------------------------------------------------------------------------------------- ! DATA CHECK !-------------------------------------------------------------------------------------- ! Data comparison number NComp = 6 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) = 'TRD2' LABEL(2,1) = 'TRD3' LABEL(3,1) = 'TRD4' LABEL(4,1) = 'VRD2' LABEL(5,1) = 'VRD3' LABEL(6,1) = 'CRTCST' ! Correct values VALUE(1,1)=0.4413367E1 VALUE(2,1)=0.1809378E1 VALUE(3,1)=0.1847808E1 VALUE(4,1)=0.4295E2 VALUE(5,1)=0.7616E1 VALUE(6,1)=0.51973 ! Comparison ~PLLSCON,TRD2 *GET,VALUE(1,2),ELEM,3,ETAB,CFETAB_J ~PLLSCON,TRD3 *GET,VALUE(2,2),ELEM,3,ETAB,CFETAB_J ~PLLSCON,TRD4 *GET,VALUE(3,2),ELEM,3,ETAB,CFETAB_J ~PLLSCON,VRD2 *GET,VALUE(4,2),ELEM,3,ETAB,CFETAB_J ~PLLSCON,VRD3 *GET,VALUE(5,2),ELEM,3,ETAB,CFETAB_J ~PLLSCON,CRTCST *GET,VALUE(6,2),ELEM,3,ETAB,CFETAB_J ! Warning and error tolerances TOLER( 1, 1)= 1E-02 $ TOLER( 1, 2)= 1E-02 TOLER( 2, 1)= 1E-02 $ TOLER( 2, 2)= 1E-02 TOLER( 3, 1)= 1E-02 $ TOLER( 3, 2)= 1E-02 TOLER( 4, 1)= 1E-02 $ TOLER( 4, 2)= 1E-02 TOLER( 5, 1)= 1E-02 $ TOLER( 5, 2)= 1E-02 TOLER( 6, 1)= 1E-02 $ TOLER( 6, 2)= 1E-02 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| TRD2 | 4.4134 | 4.4148 | 1.000 | 0.01 |
| TRD3 | 1.8094 | 1.8094 | 1.000 | 0.01 |
| TRD4 | 1.8478 | 1.8472 | 1.000 | 0.01 |
| VRD2 | 42.95 | 42.95 | 1.000 | 0.01 |
| VRD3 | 7.616 | 7.6164 | 1.000 | 0.01 |
| CRTCST | 0.51973 | 0.51938 | 1.001 | 0.01 |
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