CFVR2608 - BS 5950 (2001) Lateral torsional buckling
Lateral torsional buckling checking according to British Standard 5950 2001.
A pinned-pinned Steel beam which is subjected to a surface load of 500 kN/m
The beam is 1 m length.
The cross section is a L section with the following dimensions:
- h = 0.2 m
- tw = 0.018 m
- b = 0.15 m
- tf = 0.018 m
The aim of the example is to obtain the cross section classification and lateral torsional buckling checking criterion according to BS 5950 2001.
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: CFVR2608.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR2608' /TITLE, %NomFile%, BS 5950 (2001) Lateral torsional buckling !-------------------------------------------------------------------------------------- ! Model definition and solve !-------------------------------------------------------------------------------------- ! CivilFEM Setup: Code & Units ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,KN ~CODESEL,BS595001,BS8110,,,EC8-94 /PREP7 ! Preprocessor ! -------------------------------------------------- ! Materials ~CFMP,1,LIB,STEEL,BS5950,Gr43 ! Element type ET,1,BEAM3 ! Type 1: 3D Beam ! Cross Sections ~SSECDMS,1,L,1,0.2,1.8e-002,0.15,1.8e-002,0 ! Member Properties L = 1 KLTXY = 1.0 KLTXZ = 1.0 KCXY = 1.0 KCXZ = 1.0 CteRob = 0 n = 1 m = 1 DL = 0 CFBUCKXY = 1 CFBUCKXZ = 1 CHCKAXIS = 0 Dpa = 0 mx = 1 my = 1 mlt = 1 ~MEMBPRO,1,BS595085,ALL,L,KLTXY,KLTXZ,KCXY,KCXZ,CteRob,n,m,DL,CFBUCKXY,CFBUCKXZ,CHCKAXIS,dpa,mx,my,mlt ! Beam properties ~BMSHPRO,1,BEAM,1,1,,,3,1,0,,Beam 1 ! Nodes N, 1 N,25,1 FILL, 1,25 ! Elements E,1,2 EGEN,24,1,1 EPLOT /SOLU ! Solution ! -------------------------------------------------- ! Displacements D,1, , , , , ,UX,UY D,25, , , , , ,UX,UY ! Apply Load SFBEAM,all,1,PRES,500, , , , , , ! Solve SOLVE /POST1 ! Postprocessor ! -------------------------------------------------- ! Read results ~CFSET,,1,1 ! Load first load step ! British Standard Check for lateral buckling ~CHKSTL,BUCK_LAT,-Z, !-------------------------------------------------------------------------------------- ! 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) = 'LAMBDA' LABEL(2,1) = 'MB' LABEL(3,1) = 'CRT_TOT' ! Correct values VALUE(1,1)=31.0232 VALUE(2,1)=46.5410 VALUE(3,1)=1.1097 ! Obtained values ~CFSET,1 ! Load first alternative ~PLLSSTL,LAMBDA *GET,VALUE(1,2),ELEM,8,ETAB,CFETAB_I ~PLLSSTL,MB *GET,VALUE(2,2),ELEM,8,ETAB,CFETAB_I ~PLLSSTL,CRT_TOT *GET,VALUE(3,2),ELEM,8,ETAB,CFETAB_I ! Warning and error tolerances TOLER( 1, 1)= 1E-2 $ TOLER( 1, 2)= 1E-1 TOLER( 2, 1)= 1E-2 $ TOLER( 2, 2)= 1E-1 TOLER( 3, 1)= 1E-2 $ TOLER( 3, 2)= 1E-1 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| LAMBDA | 31.023 | 31.023 | 1.000 | 0.1 |
| MB | 46.541 | 46.541 | 1.000 | 0.1 |
| CRT_TOT | 1.1097 | 1.1098 | 1.000 | 0.1 |
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