CFVR4509 - GB50017: Compression Buckling
A fixed-pinned steel beam is subjected to a compression load of 250 kN, applied on one end of the beam.
The beam has a length of 10 m.
The cross section is a 2UPN 180.
The beam is made of GB 50017 Q235.
The aim of the example is to obtain the compression buckling criterion according to GB 50017.
Element types used in the model: BEAM3 Needed CivilFEM Modules: |
|
| Model Statistics | |
| Number of elements | 24 |
| Number of nodes | 25 |
| Number of civil materials | 1 |
| Number of cross sections | 1 |
| Number of shell vertices | 0 |
Log file: CFVR4509.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR4509' /TITLE, %NomFile%, GB50017: Compression Buckling ! --------------------------------------------------------------------------------- ! Model definition ! --------------------------------------------------------------------------------- ! CivilFEM Setup: Code & Units ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,KN ~CODESEL,GB50017,EC2,,,EC8-94 /PREP7 ! Preprocessor ! -------------------------------------------------- ! Materials ~CFMP,1,LIB,STEEL,GB50017,Q235 ! GB50017 Q235 ! Element Types ET,1,BEAM4 ! Type 1: 3D Beam ! Cross Sections ~SSECLIB,1,1,23,27 ! L 200 x 200 x 18 --> L Angle ! Member properties ~MEMBPRO,1,GB50017,ALL,0.0,0.0,0,0,10.0,1.0,1.0 ! Beam properties ~BMSHPRO,1,BEAM,1,,,,4,1,0,,Beam properties ! Nodes N, 1 N,25,,10 FILL, 1,25 ! Elements E,1,2 EGEN,24,1,1 EPLOT /SOLU ! Solution ! -------------------------------------------------- ! Displacements D, 1,UX D, 1,UY D, 1,UZ D,25,UX D,25,UZ D,ALL,ROTY ! Apply Load F,25,FY,-250 ! Solve SOLVE /POST1 ! Postprocessor ! -------------------------------------------------- ! Read results ~CFSET,,1,1 !Read first load step ! GB50017 Check in Buckling Compression ~CHKSTL,BUCK_CMP, !-------------------------------------------------------------------------------------- ! DATA CHECK !-------------------------------------------------------------------------------------- ! Data comparison number NComp = 3 NComp_ch = 0 ! Marix 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) = 'FI' LABEL(2,1) = 'SEQ' LABEL(3,1) = 'CRT_TOT' ! Correct values VALUE(1,1) = 0.134960369 VALUE(2,1) = -268035.83283 VALUE(3,1) = 1.307491867 ! Obtained values ~PLLSSTL,FI *GET,VALUE(1,2),ELEM,13,ETAB,CFETAB_I ~PLLSSTL,SEQ *GET,VALUE(2,2),ELEM,13,ETAB,CFETAB_I ~PLLSSTL,CRT_TOT *GET,VALUE(3,2),ELEM,13,ETAB,CFETAB_I ! Warning and error tolerances TOLER(1,1) = 1E-4 $ TOLER(1,2) = 1E-4 TOLER(2,1) = 1E-5 $ TOLER(2,2) = 1E-5 TOLER(3,1) = 1E-4 $ TOLER(3,2) = 1E-4 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| FI | 0.13496 | 0.13496 | 1.000 | 0.0001 |
| SEQ | -2.6804e+005 | -2.6804e+005 | 1.000 | 1e-005 |
| CRT_TOT | 1.3075 | 1.3075 | 1.000 | 0.0001 |
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