CFVR7702 - ASD13: Compression Flexural Buckling Checking
Compression Flexural Buckling Checking according to ASD13 for a cantilever beam.
A cantilever steel beam is subjected to an axial compression force of 500 kips.
The beam has a length of 21 in. The cross section is a W 14x132.
The beam is made of A572Gr50 steel which has a fy of 50 ksi.
The aim of the example is to obtain the compression flexural buckling criterion according to ASD13.
Element types used in the model: BEAM3 Needed CivilFEM Modules: |
|
| Model Statistics | |
| Number of elements | 20 |
| Number of nodes | 21 |
| Number of civil materials | 1 |
| Number of cross sections | 1 |
| Number of shell vertices | 0 |
Log file: CFVR7702.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR7702' /TITLE, %NomFile%, ASD13: Compression Flexural Buckling Checking !-------------------------------------------------------------------------------------- ! Model definition !-------------------------------------------------------------------------------------- ! CivilFEM Setup: Code & Units ~CODESEL,ASD13,EC2-91,EC2-91,,EC8-94 ~UNITS,,LENG,in ~UNITS,,TIME,S ~UNITS,,FORC,KIPS ~UNITS,,PRES,,0 ,ksi /PREP7 ! Preprocessor ! -------------------------------------------------- ! Materials ~CFMP,1,LIB,STEEL,ASTM,A572Gr50 ! Element Types ET,1,Beam3 ! Cross Section ~SSECLIB,1,1,51,183 ! W 14x132 ! Beam & Shell Property ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam 1 ! Member property ~MEMBPRO,1,ASD13,ALL,360,1.0,1.0,1.00,1.00 ~MEMBPRO,1,NLMOD,ALL,0 ~MEMBPRO,1,NAME,Member Property 1 ! Nodes N,1 N,21,,21 FILL,1,21,19, , ,1,1,1, ! Elements REAL,1 E,1,2 EGEN,20,1,1,1 /SOLU ! Solution ! -------------------------------------------------- ! Constrains D, 1,ALL ! Apply Load F,21,FY,-500 ! Solve SOLVE /POST1 ! Postprocessor ! -------------------------------------------------- ! Read results ~CFSET,,1,1 ! First load case ! Axial+bending checking ~CHKSTL,COMPFBK !-------------------------------------------------------------------------------------- ! DATA CHECK !-------------------------------------------------------------------------------------- ! Data comparison number NComp = 5 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) = 'LAMBDA ' LABEL(2,1) = 'FCR ' LABEL(3,1) = 'PN ' LABEL(4,1) = 'CRT_TOT ' LABEL(5,1) = 'CLS_COMP' ! Correct values VALUE(1,1)= 1.2655 VALUE(2,1)= 25.580 VALUE(3,1)= 992.504 VALUE(4,1)= 0.841 VALUE(5,1)= 2 ! Comparison ~PLLSSTL,LAMBDA *GET,VALUE(1,2),ELEM,1,ETAB,CFETAB_I ~PLLSSTL,FCR *GET,VALUE(2,2),ELEM,1,ETAB,CFETAB_I ~PLLSSTL,PN *GET,VALUE(3,2),ELEM,1,ETAB,CFETAB_I ~PLLSSTL,CRT_TOT *GET,VALUE(4,2),ELEM,1,ETAB,CFETAB_I ~PLLSSTL,CLS_COMP *GET,VALUE(5,2),ELEM,1,ETAB,CLASS_I ! Warning and error tolerances TOLER( 1, 1)= 2E-02 $ TOLER( 1, 2)= 2E-02 TOLER( 2, 1)= 5E-02 $ TOLER( 2, 2)= 5E-02 ! Rounding error accepted TOLER( 3, 1)= 1E-01 $ TOLER( 3, 2)= 1E-01 ! Rounding error accepted TOLER( 4, 1)= 2E-02 $ TOLER( 4, 2)= 2E-02 TOLER( 5, 1)= 2E-02 $ TOLER( 5, 2)= 2E-02 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| LAMBDA | 1.2655 | 1.2655 | 1.000 | 0.02 |
| FCR | 25.58 | 25.579 | 1.000 | 0.05 |
| PN | 992.5 | 992.45 | 1.000 | 0.1 |
| CRT_TOT | 0.841 | 0.84135 | 1.000 | 0.02 |
| CLS_COMP | 2 | 2 | 1.000 | 0.02 |
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