CFVR2607 - BS 5950 (2001) Compression Buckling
Compression buckling checking according to British Standard 5950-01
A fixed steel beam subjected to a Fy load of -250 KN, applied on one end of the beam.
The beam has a length of 10 m.
The cross section is a 2 UPN 180.
The beam is made of GrWR50A steel.
The aim of the example is to obtain the cross section classification and compression buckling criterion according to BS 5950-01.
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: CFVR2607.DAT
FINISH ~CFCLEAR,,1 NomFile='CFVR2607' /TITLE, %NomFile%, BS 5950 (2001) Compression Buckling !-------------------------------------------------------------------------------------- ! Model definition and solve !-------------------------------------------------------------------------------------- ! CivilFEM Setup: Code & Units ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,KN ~CODESEL,BS595001,EC2,,,EC8-94 /PREP7 ! Preprocessor ! -------------------------------------------------- ! Materials ~CFMP,1,LIB,STEEL,BS5950,GrWR50A !GrWR50A ! Element Types ET,1,BEAM4 ! Type 1: 3D Beam ! Cross Sections ~SSECLIB,1,1,94,6 !2 UPN 180 ! Member properties L = 10 KLTXY = 1.0 KLTXZ = 1.0 KCXY = 1.1 KCXZ = 1.1 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,,,,4,1,0,,Beam Propeties ! 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 ! Load first load step ! Check for Buckling Compression ~CHKSTL,BUCK_CMP, !-------------------------------------------------------------------------------------- ! DATA CHECK !-------------------------------------------------------------------------------------- ! Data comparison number NComp = 10 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) ='WEBCLASS' LABEL( 3,1) ='CRT_TOT' LABEL( 4,1) ='F' LABEL( 5,1) ='PC' LABEL( 6,1) ='LAMBDA' LABEL( 7,1) ='LAMBDA0' LABEL( 8,1) ='PERRYFCT' LABEL( 9,1) ='ROBERSTS' LABEL(10,1) ='RHOC' ! Correct values VALUE( 1,1)= 3 VALUE( 2,1)= 1 VALUE( 3,1)= 1.055 VALUE( 4,1)= 250. VALUE( 5,1)= 236.95 VALUE( 6,1)= 201.242 VALUE( 7,1)= 15.316 VALUE( 8,1)= 1.0226 VALUE( 9,1)= 5.5 VALUE(10,1)= 42312. ! Obtained values ~PLLSSTL,CLASS *GET,VALUE( 1,2),ELEM,1,ETAB,CLASS_J ~PLLSSTL,WEBCLASS *GET,VALUE( 2,2),ELEM,1,ETAB,CLASS_J ~PLLSSTL,CRT_TOT *GET,VALUE( 3,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,F *GET,VALUE( 4,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,PC *GET,VALUE( 5,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,LAMBDA *GET,VALUE( 6,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,LAMBDA0 *GET,VALUE( 7,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,PERRYFCT *GET,VALUE( 8,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,ROBERSTS *GET,VALUE( 9,2),ELEM,1,ETAB,CFETAB_J ~PLLSSTL,RHOC *GET,VALUE(10,2),ELEM,1,ETAB,CFETAB_J ! Warning and error tolerances TOLER( 1,1)= 1E-9 $ TOLER( 1,2)= 1E-9 TOLER( 2,1)= 1E-9 $ TOLER( 2,2)= 1E-9 TOLER( 3,1)= 1E-4 $ TOLER( 3,2)= 1E-4 TOLER( 4,1)= 1E-3 $ TOLER( 4,2)= 1E-3 TOLER( 5,1)= 1E-3 $ TOLER( 5,2)= 1E-3 TOLER( 6,1)= 1E-3 $ TOLER( 6,2)= 1E-3 TOLER( 7,1)= 1E-3 $ TOLER( 7,2)= 1E-3 TOLER( 8,1)= 1E-3 $ TOLER( 8,2)= 1E-3 TOLER( 9,1)= 1E-3 $ TOLER( 9,2)= 1E-3 TOLER(10,1)= 1E-0 $ TOLER(10,2)= 1E-0 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| CLASS | 3 | 3 | 1.000 | 1e-009 |
| WEBCLASS | 1 | 1 | 1.000 | 1e-009 |
| CRT_TOT | 1.055 | 1.0551 | 1.000 | 0.0001 |
| F | 250 | 250 | 1.000 | 0.001 |
| PC | 236.95 | 236.95 | 1.000 | 0.001 |
| LAMBDA | 201.24 | 201.24 | 1.000 | 0.001 |
| LAMBDA0 | 15.316 | 15.316 | 1.000 | 0.001 |
| PERRYFCT | 1.0226 | 1.0226 | 1.000 | 0.001 |
| ROBERSTS | 5.5 | 5.5 | 1.000 | 0.001 |
| RHOC | 42312 | 42313 | 1.000 | 1 |
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