CFVR1325 - Cracking checking according to ACI 318
Check a reinforced concrete beam for cracking according to ACI 318
A fixed beam which has a rectangular reinforced concrete section is subjected to an axial compression force of 750000 N and a bending moment of 562500 Nm. The aim of the example is to obtain the check criterion according to ACI 318.
Element types used in the model: BEAM44 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: CFVR1325.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR1325' /TITLE,%NomFile%, Cracking checking according to ACI 318 ! ------------------------------------------------------------------------------------- ! Initial data ! ------------------------------------------------------------------------------------- ! CivilFEM SETUP ~UNITS,SI ~CODESEL,,ACI !Parameters Phi=25.0 Etype=44 a=1 b=0.6 Cc=0.04 r=(3*a)/4 Smax=0.5 ! Preprocessor /PREP7 ! Material Definition ~CFMP,1,LIB,CONCRETE,ACI,fc_3500 ~CFMP,2,LIB,REINF,ACI,fy_70000 ! Element Type Definition ET,1, Etype ! Cross-section definition ~CSECDMS,1,REC,1,a,b ~RNFDEF,1,1,2,2, , Cc, , ,Phi,4, , ,4 ~RNFDEF,1,2,2,4, , Cc, , ,Phi,8, , ,4 *DO,II,1,3 ~TREFINE,1 *ENDDO ~SECMDF,1,ACIPROP ,CC,,Cc,1 ~SECMDF,1,ACIPROP ,CC,,Cc,2 ~SECMDF,1,ACIPROP,CC,,Cc,3 ~SECMDF,1,ACIPROP,CC,,Cc,4 ! Beam & Shell property ~BMSHPRO,1,BEAM,1,1,,, Etype,,,,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 ALLSEL /SOLU N = 750000 ! Axial force Mz = N*r ! Mz Bending moment F,5,FX,-N F,5,MZ,Mz SOLVE /POST1 ! Postprocessor ~CFSET,,1,1 ~CHKCON,CRACK,,,Smax, ! Alernative 1 !-------------------------------------------------------------------------------------- ! 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) = 'FS' LABEL( 2) = 'S' LABEL( 3) = 'CRT_TOT' ! Correct data, obtained data !-------------------------------------------------------------------------------------- VALUE( 1,1) = 87595508.82 VALUE( 2,1) = 0.98 VALUE( 3,1) = 0.51 ~PLLSCON,FS,1, *GET,VALUE( 1,2),ELEM,4,ETAB,CFETAB_J ~PLLSCON,S,1, *GET,VALUE( 2,2),ELEM,4,ETAB,CFETAB_J ~PLLSCON,CRT_TOT,1, *GET,VALUE( 3,2),ELEM,4,ETAB,CFETAB_J ! Warning and error tolerances TOLER( 1,1) = 1E7 $ TOLER( 1,2) = 1E7 TOLER( 2,1) = 5E-2 $ TOLER( 2,2) = 5E-2 TOLER( 3,1) = 5E-2 $ TOLER( 3,2) = 5E-2 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| FS | 8.7596e+007 | 8.7059e+007 | 1.006 | 1e+007 |
| S | 0.98 | 0.9656 | 1.015 | 0.05 |
| CRT_TOT | 0.51 | 0.51781 | 0.985 | 0.05 |
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