CFVR1417 - Torsion design according to EHE
Design a reinforced concrete beam submitted to torsion moment according to EHE
A fixed beam which has a rectangular reinforced concrete section is subjected to a torsional moment of 1.52 Mp*m and a shear force of 7.52 Mp.
The aim of the example is to obtain the necessary steel amount according to EHE.
The example is based on "PRONTUARIO INFORMATICO DEL HORMIGON ARMADO", CORRES-LEON-PEREZ-ARROYO-LOPEZ, 1994, PAGE 227
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: CFVR1417.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR1417' /TITLE,%NomFile%, Torsion design according to EHE ! ------------------------------------------------------------------------------------- ! Initial data ! ------------------------------------------------------------------------------------- ! CivilFEM SETUP ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,MP ~CODESEL,EC3-92,EHE-98,,,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,EHE,HA-25 ~CFMP,2,LIB,REINF,EHE,B400S ! 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,2,1e-4, , , ,1e-4 ! Beam properties ~BMSHPRO,1,BEAM,1,1,,,4,0,0,,Beam Prop. ! 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 first load step ! Torsion design according to EHE ~DIMCON,SHT,TORSION !-------------------------------------------------------------------------------------- ! DATA CHECK !-------------------------------------------------------------------------------------- ! Data comparison number NComp = 3 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) = 'TU1' LABEL(2,1) = 'ASTT' LABEL(3,1) = 'ASLT' ! Correct values VALUE(1,1)=0.35306393E1 VALUE(2,1)=0.31652624E-3 VALUE(3,1)=0.33461345E-3 ! Comparison ~PLLSCON,TU1 *GET,VALUE(1,2),ELEM,3,ETAB,CFETAB_J ~PLLSCON,ASTT *GET,VALUE(2,2),ELEM,3,ETAB,CFETAB_J ~PLLSCON,ASLT *GET,VALUE(3,2),ELEM,3,ETAB,CFETAB_J ! Warning and error tolerances TOLER( 1, 1)= 1E-02 $ TOLER( 1, 2)= 1E-02 TOLER( 2, 1)= 1E-05 $ TOLER( 2, 2)= 1E-05 TOLER( 3, 1)= 1E-05 $ TOLER( 3, 2)= 1E-05 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| TU1 | 3.5306 | 3.5318 | 1.000 | 0.01 |
| ASTT | 0.00031653 | 0.00031817 | 0.995 | 1e-005 |
| ASLT | 0.00033461 | 0.00033635 | 0.995 | 1e-005 |
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