CFVR7908 - CTE DB SE-A test: Compression Buckling
Compression Buckling checking according to CTE DB SE-A
A fixed steel beam subjected to a Fy load of -250 kN.
The beam has a length of 1 m.
The cross section is a IPE 450.
The beam is made of Fe 460 steel which has a fy of 460000 kN/m2.
The aim of the example is to obtain the cross section classification and compression buckling criterion according to CTE DB SE-A.
Element types used in the model: BEAM4 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: CFVR7908.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR7908' /TITLE, %NomFile%, CTE DB SE-A test: Compression Buckling ! --------------------------------------------------------------------------------- ! Model definition and solve ! --------------------------------------------------------------------------------- ! CivilFEM Setup: Code & Units ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,KN ~CODESEL,CTESEA /PREP7 ! Materials ~CFMP,1,LIB,STEEL,UNE,S 460 ! Element Types ET,1,BEAM4 ! Type 1: 3D Beam ! Cross Sections ~SSECLIB,1,1,1,15 ! IPE 450 ! Member properties ~MEMBPRO,1,CTESEA,ALL,10,1.0,1.0,1,1,1,1,0.8,1,1.0,1.0,0 ! Beam properties ~BMSHPRO,1,BEAM,1,,,,4,1,0,, ! Nodes N, 1 N,25,,10 FILL, 1,25 ! Elements E,1,2 EGEN,24,1,1 EPLOT /SOLU ! 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 ! Read results ~CFSET,,1,1 ! Read the first load step ! Buckling checking ~CHKSTL,BUCK_CMP,-Z,PARTIAL !-------------------------------------------------------------------------------------- ! DATA CHECK !-------------------------------------------------------------------------------------- ! Data comparison number NComp = 8 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) = 'CLASS' LABEL( 2,1) = 'ALP_Z' LABEL( 3,1) = 'AREA' LABEL( 4,1) = 'LAM_Z' LABEL( 5,1) = 'PHI_Z' LABEL( 6,1) = 'CHI_Z' LABEL( 7,1) = 'NBRD' LABEL( 8,1) = 'CRT_TOT' ! Correct values !-------------------------------------------------------------------------------------- VALUE( 1,1)= 4 VALUE( 2,1)= 0.13 VALUE( 3,1)= 9.229E-3 VALUE( 4,1)= 3.494 VALUE( 5,1)= 6.82 VALUE( 6,1)= 0.0788 VALUE( 7,1)= 318.6 VALUE( 8,1)= 0.78 ! Obtained values !-------------------------------------------------------------------------------------- ~PLLSSTL,CLASS *GET,VALUE( 1,2),ELEM,1,ETAB,CLASS_J ~PLLSSTL,ALP_Z *GET,VALUE( 2,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,AREA *GET,VALUE( 3,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,LAM_Z *GET,VALUE( 4,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,PHI_Z *GET,VALUE( 5,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,CHI_Z *GET,VALUE( 6,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,NBRD *GET,VALUE( 7,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,CRT_TOT *GET,VALUE( 8,2),ELEM,1,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-03 $ TOLER( 3,2)= 1E-03 TOLER( 4,1)= 1E-01 $ TOLER( 4,2)= 1E-01 TOLER( 5,1)= 1E-01 $ TOLER( 5,2)= 1E-01 TOLER( 6,1)= 1E-02 $ TOLER( 6,2)= 1E-02 TOLER( 7,1)= 1E-00 $ TOLER( 7,2)= 1E-00 TOLER( 8,1)= 1E-01 $ TOLER( 8,2)= 1E-01 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| CLASS | 4 | 4 | 1.000 | 0.01 |
| ALP_Z | 0.13 | 0.13 | 1.000 | 0.01 |
| AREA | 0.009229 | 0.0091075 | 1.013 | 0.001 |
| LAM_Z | 3.494 | 3.4714 | 1.007 | 0.1 |
| PHI_Z | 6.82 | 6.7378 | 1.012 | 0.1 |
| CHI_Z | 0.0788 | 0.07992 | 0.986 | 0.01 |
| NBRD | 318.6 | 318.88 | 0.999 | 1 |
| CRT_TOT | 0.78 | 0.784 | 0.995 | 0.1 |
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